Solar power generation device proposal system and solar power generation device proposal method

Abstract

To provide a system capable of evaluating the advantages and disadvantages of a solar power generation device, taking into account future fluctuations in a self-consumption power amount.SOLUTION: A system for proposing a solar power generation device to be installed in a house to a target person includes; a first storage unit which stores first design factors necessary to calculate energy consumption performance including a predicted power generation amount per unit period for each of a plurality of solar power generation devices with different installation capacities and a predicted self-consumption power amount which is an expected power amount consumed in the house; a second storage unit which stores second design factors which are factors determined by the target person or predetermined, and causing future fluctuations in the predicted self-consumption power amount; a first calculation unit which calculates the energy consumption performance during a predetermined period after installation of the solar power generation device on the basis of the first design factor and the second design factor; a second calculation unit which calculates information 31 related to utility costs of the house and / or information 32 related to a depreciation period of the solar power generation device on the basis of the energy consumption performance, computes; and an output unit which outputs the information.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present invention relates to a proposal system and a proposal method for a photovoltaic power generation device.

Background Art

[0002] In recent years, due to the tight power supply and demand and the instability of energy prices, the interest in energy-saving houses equipped with photovoltaic power generation devices has been increasing. There are multiple types of devices with different installation amounts (power generation capacities) of photovoltaic power generation devices. Generally, as the installation amount increases, the price of the photovoltaic power generation device increases, so the payback period of the device increases. Therefore, for example, it is important to calculate the energy consumption performance of the house to be installed and select an appropriate installation amount of the photovoltaic power generation device. For the calculation of energy consumption performance, for example, the program of Non-Patent Document 1 below is used.

Prior Art Documents

Non-Patent Documents

[0003]

Non-Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Generally, based on the construction site and building performance, the energy consumption performance including the predicted self-consumption power is calculated. However, due to various factors such as changes in the number of occupants and housing facilities, the predicted self-consumption power fluctuates in the future. Therefore, in recent years, a system that can evaluate the merits or demerits of a photovoltaic power generation device in consideration of such future fluctuations in self-consumption power has been desired.

[0005] The present invention has been devised in view of the above actual situation, and the main object thereof is to provide a system capable of evaluating the merits or demerits of a photovoltaic power generation device in consideration of fluctuations in future self-consumption power generation amounts.

Means for Solving the Problems

[0006] The present invention is a system for proposing a photovoltaic power generation device to be installed in a house, comprising: a first storage unit that stores first design factors necessary for calculating energy consumption performance including the predicted power generation amount per unit period of each of a plurality of photovoltaic power generation devices having different installation amounts and the predicted self-consumption power generation amount, which is the predicted power consumption in the house; a second storage unit that stores a second design factor, which is a factor for varying the predicted self-consumption power generation amount determined by the subject person or predetermined in advance; a first calculation unit that calculates the energy consumption performance for a predetermined period after installation of the photovoltaic power generation device based on the first design factor and the second design factor; a second calculation unit that calculates information regarding the light and heat cost of the house and / or information regarding the depreciation years of the photovoltaic power generation device based on the energy consumption performance; and an output unit that outputs the information. It is a proposal system for a photovoltaic power generation device.

Effects of the Invention

[0007] By adopting the above configuration, the proposed system for a photovoltaic power generation device of the present invention can evaluate the merits or demerits of the photovoltaic power generation device in consideration of fluctuations in future self-consumption power generation amounts.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Embodiments for Carrying Out the Invention

[0009] Hereinafter, embodiments of the present invention will be described with reference to the drawings. It should be understood that the drawings include exaggerated expressions and expressions different from the actual dimensional ratios of the structures in order to assist in understanding the content of the invention. Also, throughout each embodiment, the same or common elements are denoted by the same reference numerals, and redundant descriptions are omitted. Furthermore, the specific configurations shown in the embodiments and the drawings are for understanding the content of the present invention, and the present invention is not limited to the specific configurations shown.

[0010] In the proposed system for a solar power generation device of the present embodiment (hereinafter sometimes referred to as the "proposed system"), a solar power generation device installed in a house is proposed to a subject. In the present embodiment, the house in which the solar power generation device is installed is exemplified as a newly constructed property for which construction is planned. In this case, for example, the proposed system may be used in the design stage (planning) for determining the floor plan of the house, etc., or the proposed system may be used after the design is completed (after planning). Also, examples of the subject to whom the solar power generation device is proposed include, for example, the donor of the house, the management company of a rental house, etc.

[0011] In addition, the house on which the solar power generation device is installed is not limited to newly constructed properties, and may be, for example, an existing property. In this case, for example, the proposed system may be used in the design stage (planning) of the renovation of the house. In addition, examples of the target persons to whom the solar power generation device is proposed include, for example, the owner of the house, the management company of the rental house, and the like.

[0012] The proposed system of this embodiment is used, for example, as a negotiation tool for a service person of a construction company to propose a solar power generation device to a target person (for example, a donor or owner of a house, etc.) during negotiation with the target person. The construction company includes, for example, a house builder, a construction company, and a power company.

[0013] In a house equipped with a solar power generation device, by partially consuming the solar power generation (renewable energy) for self-use, the energy purchased from the outside can be reduced. As a result, the house can be recognized as a ZEH house (that is, a house that meets the ZEH standard). Here, ZEH is an abbreviation for Net Zero Energy House, which is a house aimed at making the energy balance zero or less.

[0014] [House] FIG. 1 is a cross-sectional view showing an example of a house 1 to which a solar power generation device is proposed. The house 1 of this embodiment is provided with an outer skin 2 and equipment 3.

[0015] The outer skin 2 is a member that constitutes the thermal boundary of the house 1. The outer skin 2 includes, for example, an outer wall 2a, a ceiling 2c, a roof 2d, a window 2e, and a foundation 2f.

[0016] The equipment 3 is a device installed in the house 1. The equipment 3 includes, for example, an air conditioner 3a, a ventilation device 3b, a water heater 3c, and a lighting device 3d. Further, the equipment 3 includes a solar power generation device 3e proposed by the proposed system (provision method) of this embodiment.

[0017] Incidentally, there are multiple types of solar power generation devices 3e with different installed capacities (power generation capacities). Generally, as the installed capacity increases, the price of the solar power generation device 3e increases, and the payback period of the solar power generation device 3e increases. For this reason, for example, it is important to calculate the energy consumption performance of the house 1 where the solar power generation device 3e is installed and select an appropriate installed capacity of the solar power generation device 3e.

[0018] Generally, based on the building site and building performance of the current house (or the house after construction in the case of a newly built property) 1, the energy consumption performance including the predicted self-consumption power amount is calculated. However, due to various factors such as changes in the number of occupants and equipment 3, the predicted self-consumption power amount will fluctuate in the future. It is difficult to present the merits or demerits of installing the solar power generation device 3e to the target person (for example, the donor, the owner, etc.) after considering such future fluctuations in the self-consumption power amount and propose the solar power generation device 3e.

[0019] [Solar Power Generation Device Proposal System] In the proposal system of this embodiment, it is possible to present the merits or demerits of installing the solar power generation device 3e after considering the future fluctuations in the self-consumption power amount and propose the solar power generation device 3e. As a result, the target person (for example, the donor, the owner, etc.) can evaluate the future merits or demerits of the solar power generation device 3e in advance, so it is possible to propose a solar power generation device 3e that is highly acceptable to the target person. FIG. 2 is a block diagram showing an example of the configuration of the solar power generation device proposal system 10.

[0020] The proposed system 10 of this embodiment includes an input device 11, a display device 12, and an arithmetic processing unit 13 (computer 14). An assembly of these devices can constitute a proposed system 10 capable of exerting a function of proposing the photovoltaic power generation device 3e shown in FIG. 1. The arithmetic processing unit 13 (computer 14) of this embodiment is constituted by, for example, a personal computer, a portable information terminal (such as a tablet type), etc., but is not particularly limited. For example, it may be configured as a server (cloud server).

[0021] [Input Device · Display Device] As shown in FIG. 2, for the input device 11, for example, a keyboard, a mouse, a touch panel, etc. are used. For the display device 12, for example, a display device, a printer, etc. are used.

[0022] [Arithmetic Processing Unit] The arithmetic processing unit 13 includes an arithmetic unit (CPU) 15 that performs various operations, a storage unit 16 in which data, programs, etc. are stored, and a working memory 17.

[0023] [Storage Unit] The storage unit 16 is a non-volatile information storage device composed of, for example, a magnetic disk, an optical disk, or an SSD. The storage unit 16 is configured to include a data unit 19 and a program unit 20.

[0024] [Data Unit] The data unit 19 is for storing information (data) necessary for the proposal of the photovoltaic power generation device 3e shown in FIG. 1. The data unit 19 of this embodiment includes a first storage unit 19a, a second storage unit 19b, a third storage unit 19c, a fourth storage unit 19d, and a fifth storage unit 19e. Note that the data unit 19 is not limited to such a mode. For example, some of these may be omitted, or an input unit (not shown) for storing other data may be further included. Details of the data stored in these data units 19 will be described later.

[0025] [Program Unit] The program unit 20 is a program (computer program) necessary for executing the method for proposing a solar power generation device. When this program unit (program) 20 is executed by the arithmetic unit 15, the computer 14 can be made to function as specific means for proposing the solar power generation device 3e shown in FIG. 1.

[0026] The program unit 20 of the present embodiment includes a first calculation unit 20a and a second calculation unit 20b. Further, the program unit 20 includes a first input unit 20c, a second input unit 20d, an output unit 20e, and a determination unit 20f. The program unit 20 is not limited to such a mode. For example, some of these may be omitted, or a program unit (not shown) having other functions may be further included. Details of the functions of these program units 20 will be described later.

[0027] [Method for Proposing a Solar Power Generation Device (First Embodiment)] The proposal system 10 of the present embodiment proposes the solar power generation device 3e shown in FIG. 1 to a target person (for example, a donor, an owner, etc.) based on the processing procedure of the method for proposing a solar power generation device (hereinafter sometimes referred to as the "proposal method"). FIG. 3 is a flowchart showing an example of the processing procedure of the method for proposing a solar power generation device.

[0028] [Input of the First Design Factor Required for Calculating the Energy Consumption Performance of a House] In the proposal method of the present embodiment, first, the first design factor required for calculating the energy consumption performance of the house 1 shown in FIG. 1 is input to the computer 14 shown in FIG. 2 (step S1). In the present embodiment, the energy consumption performance predicted using the first design factor includes the predicted power generation amount per unit period of the solar power generation device 3e and the predicted self-consumption power amount, which is the predicted power consumption amount consumed in the house 1.

[0029] In step S1 of the present embodiment, first, the first input unit 20c included in the program unit 20 shown in FIG. 2 is read into the work memory 17. The first input unit 20c is a program for inputting the first design factor 21 required for calculating the energy consumption performance of the house 1 shown in FIG. 1. By executing this first input unit 20c by the arithmetic unit 15, the computer 14 can function as a means for inputting the first design factor 21.

[0030] The first design factor 21 is appropriately input as long as the energy consumption performance can be calculated. For example, when the energy consumption performance is calculated using the above-mentioned Non-Patent Document 1, the first design factor 21 includes information regarding the outer skin 2, equipment 3, floor plan, and the region of the house 1, etc.

[0031] Details of the first design factor 21 are described in Non-Patent Document 1 and Non-Patent Document 2 (National Institute of Advanced Industrial Science and Technology, "Technical Information on Evaluation of Energy Consumption Performance in Accordance with the Energy Conservation Standards for Fiscal Year 2016 (Housing) Current Edition", [online], [searched on October 26, 2023], Internet <URL:https: / / www.kenken.go.jp / becc / house.html>), etc. Further, the first design factor corresponds to, for example, the "first design information" and "second design information" described in the patent document (Japanese Patent No. 6997699).

[0032] In the present embodiment, for example, when the house 1 shown in FIG. 1 is a newly constructed property, the first design factor 21 (information regarding the outer skin 2, equipment 3, floor plan, and the region of the house 1, etc.) can be specified based on the requests of the subject (for example, the donor or owner of the house 1), etc. On the other hand, when the house 1 is an existing property, the first design factor 21 can be specified based on, for example, the design drawings of the house 1. Therefore, the first design factor 21 can be specified as the design factor (initial design factor) immediately after the solar power generation device 3e is installed.

[0033] The first design factor of this embodiment includes information (such as the installation amount) regarding a plurality of solar power generation devices 3e with different installation amounts. Thereby, for each of the plurality of solar power generation devices 3e, the predicted power generation amount per unit period can be calculated.

[0034] The number of the plurality of solar power generation devices 3e included in the first design factor 21 is appropriately set as long as the merits or demerits of the solar power generation devices 3e can be evaluated, and for example, it can be set to 2 to 8. In this embodiment, it is set to 6, and the plurality of solar power generation devices 3e include a first solar power generation device, a second solar power generation device, a third solar power generation device, a fourth solar power generation device, a fifth solar power generation device, and a sixth solar power generation device. Further, the installation amount of the solar power generation device 3e can be set to, for example, 3.0 kW to 8.0 kW. An example of the installation amount of each solar power generation device 3e is as follows. First solar power generation device: 5.0 kW Second solar power generation device: 5.5 kW Third solar power generation device: 6.0 kW Fourth solar power generation device: 6.5 kW Fifth solar power generation device: 7.0 kW Sixth solar power generation device: 6.5 kW

[0035] As described above, the energy consumption performance includes the predicted self-consumption power amount, which is the predicted power consumption amount consumed in House 1. This predicted self-consumption power amount is the power amount consumed in House 1 among the predicted power generation amounts of the solar power generation devices 3e in a unit period. This predicted self-consumption power amount may vary according to the predicted power generation amount of the solar power generation devices 3e. Therefore, it is preferable that the predicted self-consumption power amount is calculated according to the installation amounts of the solar power generation devices (the first solar power generation device to the sixth solar power generation device) 3e installed in House 1.

[0036] Furthermore, the energy consumption performance includes the predicted electricity purchase amount used in House 1. This predicted electricity purchase amount is the amount of electricity obtained by subtracting the predicted self-consumption electricity amount from all the predicted total electricity consumption amounts consumed in House 1 during a unit period. That is, the predicted electricity purchase amount can be specified as the amount of electricity purchased from the power company. This predicted electricity purchase amount may vary depending on the predicted power generation amount of the solar power generation device 3e and the predicted self-consumption electricity amount. Therefore, it is preferable that the predicted electricity purchase amount is calculated according to the installation amount of the solar power generation devices (the first to sixth solar power generation devices) 3e installed in House 1.

[0037] The unit period for calculating the energy consumption performance can be set as appropriate as long as the merits or demerits of the solar power generation device 3e can be evaluated. The unit period in this embodiment is set to one year, but is not limited to such a mode.

[0038] In step S1 of this embodiment, first, an input screen (not shown) for inputting the first design factor 21 is displayed on the display device 12 by the first input unit 20c (computer 14) shown in FIG. 2. This input screen may be displayed, for example, by the program of the above Non-Patent Document 1 or the energy consumption performance calculation program (residential version) API provided by the National Institute of Advanced Industrial Science and Technology.

[0039] Next, in step S1 of this embodiment, according to the instructions on the above input screen, the first design factor specified by the subject (for example, the donor or owner of House 1) or the service person is input into the arithmetic unit 15 (computer 14) via the input device 11, for example. Note that the mode of inputting the first design factor via the input device 11 is not necessarily limited. For example, a predetermined (default) first design factor may be input. The first design factor input into the arithmetic unit 15 is input into the first storage unit 19a (computer 14).

[0040] [Input the second design factor that will vary the predicted self-consumption electricity amount in the future] Next, in the proposed method of this embodiment, a second design factor, which is a factor that will vary the predicted self-consumption power included in the energy consumption performance in the future, is input to the computer 14 (shown in FIG. 2) (step S2). The second design factor may be determined by the subject (for example, the donor or owner of House 1, etc.), or may be determined in advance prior to step S2 (for example, determined in advance as a model plan).

[0041] In step S2 of this embodiment, first, a second input unit 20d included in the program unit 20 shown in FIG. 2 is read into the working memory 17. The second input unit 20d is a program for inputting a second design factor that is a factor that will vary the predicted self-consumption power in the future. By this second input unit 20d being executed by the arithmetic unit 15, the computer 14 can be made to function as means for inputting the second design factor.

[0042] As described above, the second design factor is a factor that will vary the predicted self-consumption power in the future. By such a second design factor being input, it becomes possible to calculate the predicted self-consumption power that will vary in the future.

[0043] In this embodiment, for example, when House 1 shown in FIG. 1 is a newly constructed property, after the construction of House 1 equipped with a solar power generation device (any one of the first to sixth solar power generation devices) 3e, a second design factor that will vary the predicted self-consumption power in the future is input. On the other hand, when House 1 is an existing property, after installing the solar power generation device 3e in that House 1, a second design factor that will vary the predicted self-consumption power in the future is input.

[0044] The second design factor can be appropriately input as long as it is a factor that will vary the predicted self-consumption power in the future. The second design factor of this embodiment includes at least one of a factor that increases the predicted self-consumption power (hereinafter sometimes referred to as an "increase factor") and a factor that decreases the predicted self-consumption power (hereinafter sometimes referred to as a "decrease factor").

[0045] In this embodiment, the increase factor includes, for example, the addition of at least one of an EV outlet (not shown), a power storage device (not shown), and a heat pump water heater (not shown) to House 1.

[0046] The EV outlet is for storing electric power in the battery of an electric vehicle or the like. Such an EV outlet can store the generated electric power in the battery of an electric vehicle or the like during the day when the solar power generation device 3e (shown in FIG. 1) generates power. Therefore, when the EV outlet is added to House 1, the predicted self-consumption power consumption increases. Further, the EV outlet includes a V2H (Vehicle to Home) device. The V2H device is for storing electric power in the battery of an electric vehicle or the like and supplying the stored electric power to House 1. Such a V2H device can store the generated electric power in the battery of an electric vehicle or the like during the day when the solar power generation device 3e (shown in FIG. 1) generates power. Further, the V2H device can supply the electric power stored in the battery of an electric vehicle or the like to House 1, for example, at night. Therefore, when the V2H device is added to House 1, the predicted self-consumption power consumption increases.

[0047] The power storage device is for storing the electric power generated by the solar power generation device 3e (shown in FIG. 1). Such a power storage device can store the generated electric power during the day when the solar power generation device 3e generates power. Further, the power storage device can use the electric power stored during the day, for example, at night. Therefore, when the power storage device is added to House 1, the predicted self-consumption power consumption increases.

[0048] The heat pump water heater is capable of performing a boiling (boosting) operation during the day (midday). Such a heat pump water heater can perform a boiling (boosting) operation using the generated electric power during the day when the solar power generation device 3e (shown in FIG. 1) generates power. Therefore, when the heat pump water heater is added to House 1, the predicted self-consumption power consumption increases.

[0049] Furthermore, in this embodiment, the increase factor includes, for example, an increase in the number of occupants in House 1 shown in FIG. 1. Generally, when the number of occupants in House 1 increases due to a birth or the like, the power consumption in House 1 tends to increase including during the daytime when the solar power generation device 3e generates power. Therefore, when the number of occupants in House 1 is increased, the predicted self-consumption power amount increases.

[0050] On the other hand, the decrease factor includes a reduction in the number of occupants in House 1. Generally, when the number of occupants decreases due to a child becoming independent or the like, the power consumption in House 1 tends to decrease including during the daytime when the solar power generation device 3e generates power. Therefore, when the number of occupants in House 1 is reduced, the predicted self-consumption power amount decreases.

[0051] In step S2 of this embodiment, by inputting at least one of the increase factor and the decrease factor as the second design factor, it becomes possible to calculate the predicted self-consumption power amount that will vary in the future. In this embodiment, both the increase factor and the decrease factor can be input as the second design factor. Thereby, it becomes possible to accurately calculate the predicted self-consumption power amount that will vary in the future.

[0052] The second design factor is input as appropriate. In this embodiment, the second design factor is input according to an input screen for inputting the second design factor (hereinafter, may be referred to as the "second design factor input screen"). This second design factor input screen is displayed on the display device 12 by the second input unit 20d (computer 14) shown in FIG. 2. FIG. 4 is a diagram showing an example of the second design factor input screen 23.

[0053] The second design factor input screen 23 of this embodiment is provided with a second design factor selection unit 25 for selecting the second design factor 22. The second design factor selection unit 25 of this embodiment includes an increase factor selection unit 26 and a decrease factor selection unit 27. Furthermore, the second design factor selection unit 25 of this embodiment includes an increase timing input unit 28 and a decrease timing input unit 29.

[0054] The increase factor selection unit 26 is for selecting an increase factor (a factor that increases the predicted self-consumption power consumption) among the second design factors 22. The increase factor selection unit 26 of the present embodiment includes a number addition selection unit 26a, an EV outlet selection unit 26b, a power storage device selection unit 26c, and a water heater selection unit 26d. These increase factor selection units 26 are, for example, displayed as check boxes, but are not particularly limited.

[0055] The increase timing input unit 28 is for inputting the timing when the predicted self-consumption power consumption will increase in the future after the solar power generation device 3e is installed. By inputting such a timing, it becomes possible to calculate the predicted self-consumption power consumption that varies in the future with high accuracy.

[0056] The increase timing input unit 28 of the present embodiment includes a number addition timing input unit 28a, an EV outlet addition timing input unit 28b, a power storage device addition timing input unit 28c, and a water heater addition timing input unit 28d. The increase timing input unit 28 is displayed as a pull-down menu that can select an arbitrary timing from a plurality of predetermined timings, but is not particularly limited. For example, it may be a text box in which the timing can be directly input.

[0057] Also, the range of the timing that can be input to the increase timing input unit 28 may be set as appropriate. The range of the timing in the present embodiment is set to be equal to or less than the range of the period during which the energy consumption performance is calculated in step S3 described later (in this example, 1 to 20 years).

[0058] The number addition selection unit 26a is for selection, for example, when it is predicted (planned) that the number of occupants in House 1 will increase due to a birth or the like. By selecting this number addition selection unit 26a, the addition of the number of occupants in House 1 can be input (determined) as a future increase factor. Further, when the number addition selection unit 26a is selected, the timing when the addition of the number of occupants is predicted is input to the number addition timing input unit 28a.

[0059] The EV outlet selection unit 26b is for selection when it is predicted (planned) that an EV outlet (electric vehicle) will be purchased. When this EV outlet selection unit 26b is selected, the addition of an EV outlet to House 1 can be input (determined) as a future increase factor. Also, when the EV outlet selection unit 26b is selected, the time when the purchase of the EV outlet is expected is input to the EV outlet addition timing input unit 28b.

[0060] The power storage device selection unit 26c is for selection when it is predicted (planned) that a power storage device will be purchased. When this power storage device selection unit 26c is selected, the addition of a power storage device to House 1 can be input (determined) as a future increase factor. Also, when the power storage device selection unit 26c is selected, the time when the purchase of the power storage device is expected is input to the power storage device addition timing input unit 28c.

[0061] The water heater selection unit 26d is for selection when it is predicted (planned) that a heat pump water heater will be purchased. When this water heater selection unit 26d is selected, the addition of a heat pump water heater to House 1 can be input (determined) as a future increase factor. Also, when the water heater selection unit 26d is selected, the time when the purchase of the heat pump water heater is expected is input to the water heater addition timing input unit 28d.

[0062] The decrease factor selection unit 27 is for selecting a decrease factor (a factor that reduces the predicted self-consumption power amount). The decrease factor selection unit 27 in this embodiment includes a number of people decrease selection unit 27a. This decrease factor selection unit 27 is, for example, displayed as a check box, but is not particularly limited.

[0063] The decrease timing input unit 29 is for inputting the time when the predicted self-consumption power amount will decrease in the future after the solar power generation device 3e is installed. By inputting such a time, it becomes possible to calculate the predicted self-consumption power amount that varies in the future with high accuracy.

[0064] The decrease timing input unit 29 of this embodiment includes a population decrease timing input unit 29a. The decrease timing input unit 29 is displayed as a pull-down menu that can select an arbitrary timing from a plurality of predetermined timings, but is not particularly limited. For example, it may be a text box in which the timing can be directly input.

[0065] Also, the range of timings that can be input to the decrease timing input unit 29 may be set as appropriate. The range of timings in this embodiment is set to be equal to or less than the range of the period during which the energy consumption performance is calculated in step S3 described later (in this example, 1 to 20 years).

[0066] The population decrease selection unit 27a is, for example, for selection when it is predicted (planned) that the number of occupants will decrease due to the independence of children or the like. When this population decrease selection unit 27a is selected, the decrease in the number of occupants in House 1 is input (determined) as a future decrease factor. Further, when the population decrease selection unit 27a is selected, the timing when the decrease in the number of occupants is predicted is input to the population decrease timing input unit 29a.

[0067] In step S2 of this embodiment, for example, on the second design factor input screen 23, the increase factor selection unit 26 and / or the decrease factor selection unit 27 are selected by the target person (for example, the donor or owner of House 1). Further, the timing when the predicted change in the predicted self-consumption power consumption is predicted is input to the increase timing input unit 28 corresponding to the selected increase factor selection unit 26 and / or the decrease timing input unit 29 corresponding to the decrease factor selection unit 27. Thereby, the second design factor 22 is determined.

[0068] In the example shown in FIG. 4, the population decrease selection unit 27a is selected, and "10 years" is input to the population decrease timing input unit 29a. Thereby, it can be determined as the second design factor 22 that decreases the predicted self-consumption power consumption in the future that the number of occupants will decrease due to the independence of children or the like 10 years after the solar power generation device 3e is installed.

[0069] Furthermore, in the example shown in FIG. 4, the EV outlet selection unit 26b is selected, and "15 years" is input to the EV outlet addition timing input unit 28b. As a result, it can be determined as the second design factor 22 for increasing the future predicted self-consumption power consumption that an EV outlet will be purchased 15 years after the photovoltaic power generation device 3e is installed. The determined second design factor 22 is input to the second storage unit 19b (computer 14) shown in FIG. 2.

[0070] [Calculate the energy consumption performance after the installation of the photovoltaic power generation device] Next, in the proposed method of this embodiment, the computer 14 shown in FIG. 2 calculates the energy consumption performance for a predetermined period after the installation of the photovoltaic power generation device 3e shown in FIG. 1 (step S3). This energy consumption performance is calculated based on the first design factor 21 (shown in FIG. 1) and the second design factor 22 (shown in FIG. 4).

[0071] As described above, the first design factor 21 (shown in FIG. 1) includes information on a plurality of photovoltaic power generation devices (in this example, the first photovoltaic power generation device to the sixth photovoltaic power generation device) 3e with different installation amounts. Among these plurality of photovoltaic power generation devices 3e, based on one photovoltaic power generation device (in this example, the second photovoltaic power generation device) 3e, the energy consumption performance after the installation of the photovoltaic power generation device 3e is calculated. Note that for each of the plurality of photovoltaic power generation devices 3e, the energy consumption performance after the installation of each photovoltaic power generation device 3e may be calculated respectively.

[0072] In step S3 of this embodiment, first, the first design factor 21 (shown in FIG. 1) stored in the first storage unit 19a shown in FIG. 2 and the second design factor 22 (shown in FIG. 4) stored in the second storage unit 19b are read into the working memory 17. Further, the first calculation unit 20a included in the program unit 20 is read into the working memory 17.

[0073] The first calculation unit 20a is a program for calculating the energy consumption performance during a predetermined period after the installation of the photovoltaic power generation device (in this example, the second photovoltaic power generation device) 3e based on the first design factor 21 and the second design factor 22. By the first calculation unit 20a being executed by the arithmetic unit 15, the computer 14 can be made to function as means for calculating the energy consumption performance.

[0074] The period during which the energy consumption performance is calculated can be set as appropriate, for example, as long as it is possible to evaluate the merits or demerits of installing the photovoltaic power generation device (in this example, the second photovoltaic power generation device) 3e. The period in this embodiment is set to 20 years after the installation of the photovoltaic power generation device 3e.

[0075] The energy consumption performance of the house 1 can be calculated as appropriate. In this embodiment, for example, the program of the above Non-Patent Document 1 or the energy consumption performance calculation program (house version) API provided by the National Institute of Advanced Industrial Science and Technology is used for calculating the energy consumption performance of the house 1. When, for example, the first design factor 21 (shown in FIG. 1) is input to these programs, the energy consumption performance per unit period (in this example, 1 year) based only on the first design factor 21 can be calculated.

[0076] As described above, in the example shown in FIG. 4, 10 years after the installation of the photovoltaic power generation device (in this example, the second photovoltaic power generation device) 3e, the decrease in the number of occupants due to the independence of children or the like is determined as the second design factor 22 that is expected to reduce the future self-consumption power consumption. Here, "10 years later" indicates after the 11th year when the year of installation of the photovoltaic power generation device is taken as the first year.

[0077] Furthermore, 15 years after the installation of the photovoltaic power generation device 3e, the purchase of an EV outlet is determined as the second design factor 22 that is expected to increase the future self-consumption power consumption. Here, "15 years later" indicates after the 16th year when the year of installation of the photovoltaic power generation device is taken as the first year.

[0078] Thus, in the example shown in FIG. 4, in the 10 years (from the 1st year to the 10th year) after the photovoltaic power generation device 3e is installed, the second design factor 22 that will vary the predicted self-consumption power in the future has not been determined. In this case, the energy consumption performance per unit period calculated based only on the first design factor 21 (shown in FIG. 1) is calculated as the energy consumption performance of each year in the 10 years (from the 1st year to the 10th year) after the installation of the photovoltaic power generation device 3e, respectively.

[0079] In the example shown in FIG. 4, from the 11th year to the 15th year after the photovoltaic power generation device (in this example, the second photovoltaic power generation device) 3e is installed, as the second design factor 22 that will decrease the predicted self-consumption power in the future, the reduction of the number of occupants in House 1 is input (selected by the number reduction selection unit 27a).

[0080] To calculate the energy consumption performance of each year from the 11th year to the 15th year, first, based only on the first design factor 21 (shown in FIG. 1), the energy consumption performance (including the predicted power generation amount, the predicted self-consumption power amount, and the predicted power purchase amount) per unit period (each year) is calculated. Among these predicted power generation amount, predicted self-consumption power amount, and predicted power purchase amount, the predicted power generation amount does not vary due to the second design factor 22 (reduction of the number of occupants).

[0081] On the other hand, the predicted self-consumption power amount varies due to the second design factor 22 (reduction of the number of occupants). To calculate such a predicted self-consumption power amount, the predicted self-consumption power amount per unit period based only on the first design factor 21 is multiplied by, for example, a predetermined first coefficient. Thereby, the predicted self-consumption power amount per unit period that varies (decreases due to the reduction of the number of occupants) due to the second design factor 22 is calculated.

[0082] The first coefficient can be appropriately set (for example, 0.6 to 0.9) based on, for example, a plurality of experimental results obtained by measuring the self-consumption power amount before the reduction of the number of occupants and the self-consumption power amount after the reduction of the number of occupants, respectively.

[0083] Furthermore, the predicted electricity purchase amount varies depending on the predicted self-consumption electricity amount that varies due to the second design factor 22 (reduction in the number of occupants). To calculate such a predicted electricity purchase amount, the predicted total consumption electricity amount per unit period used in House 1 is subtracted by the predicted self-consumption electricity amount per unit period that varies due to the second design factor 22. Thereby, the predicted electricity purchase amount per unit period that varies depending on the predicted self-consumption electricity amount is calculated. Note that the predicted total consumption electricity amount is appropriately calculated according to the number of occupants in House 1 and the like.

[0084] Then, the energy consumption performance including the predicted power generation amount per unit period, the predicted self-consumption electricity amount per unit period that varies, and the predicted electricity purchase amount per unit period that varies is calculated as the energy consumption performance for each year from the 11th year to the 15th year after the solar power generation device (in this example, the second solar power generation device) 3e is installed.

[0085] In the example shown in FIG. 4, from the 16th year to the 20th year after the solar power generation device (in this example, the second solar power generation device) 3e is installed, the reduction in the number of occupants in House 1 is input (selected by the number reduction selection unit 27a) as the second design factor 22 that will reduce the predicted self-consumption electricity amount in the future. Furthermore, the addition of an EV outlet to House 1 is input (selected by the EV outlet selection unit 26b) as the second design factor 22 that will increase the predicted self-consumption electricity amount in the future.

[0086] To calculate the energy consumption performance for each year from the 16th year to the 20th year, first, based on only the first design factor 21, the energy consumption performance (including the predicted power generation amount, the predicted self-consumption electricity amount, and the predicted electricity purchase amount) per unit period (for each year) is calculated. Note that among these predicted power generation amount, predicted self-consumption electricity amount, and predicted electricity purchase amount, the predicted power generation amount does not vary due to the second design factor 22 (reduction in the number of occupants and addition of an EV outlet).

[0087] On the one hand, the predicted self-consumption power varies depending on the second design factor 22 (reduction in the number of occupants and addition of EV outlets). To calculate such predicted self-consumption power, for example, a predetermined first coefficient and a second coefficient are multiplied by the predicted self-consumption power per unit period based only on the first design factor 21. As a result, the predicted self-consumption power per unit period that varies due to the second design factor 22 (decreases due to the reduction in the number of occupants and increases due to the addition of EV outlets) is calculated.

[0088] The first coefficient is as described above. The second coefficient can be appropriately set (for example, 1.1 to 3.0) based on, for example, multiple experimental results obtained by measuring the self-consumption power before the addition of EV outlets and the self-consumption power after the addition of EV outlets.

[0089] Furthermore, the predicted power purchase volume varies depending on the predicted self-consumption power that has varied due to the second design factor 22 (reduction in the number of occupants and addition of EV outlets). To calculate such predicted power purchase volume, the predicted total consumption power per unit period used in House 1 is subtracted by the predicted self-consumption power per unit period that has varied due to the second design factor 22. As a result, the predicted power purchase volume per unit period that varies depending on the predicted self-consumption power is calculated.

[0090] Then, the energy consumption performance including the predicted power generation amount per unit period, the predicted self-consumption power per unit period that has varied, and the predicted power purchase volume per unit period that has varied is calculated as the energy consumption performance for each year from the 16th year to the 20th year after the solar power generation device (in this example, the second solar power generation device) 3e is installed.

[0091] In step S3 of the present embodiment, the energy consumption performance (including the predicted power generation amount, the predicted self-consumption power amount, and the predicted power purchase amount) for each year from the first year to the twentieth year is totaled. Thereby, considering the fluctuations in the future self-consumption power amount, the energy consumption performance (total energy consumption performance) for 20 years after the solar power generation device (in this example, the second solar power generation device) 3e is installed can be calculated. The calculated energy consumption performance (the energy consumption performance for each year and the total energy consumption performance) is stored in the fourth storage unit 19d shown in FIG. 2.

[0092] [Calculate information on the heating and cooling costs of the house and / or information on the depreciation years of the solar power generation device] Next, in the proposed method of the present embodiment, the computer 14 (shown in FIG. 2) calculates information on the heating and cooling costs of the house 1 shown in FIG. 1 and / or information on the depreciation years of the solar power generation device 3e based on the energy consumption performance (step S4).

[0093] In the present embodiment, both the information on the heating and cooling costs of the house 1 and the information on the depreciation years of the solar power generation device 3e are calculated, but only one of them may be output. Also, the period for which the information on the heating and cooling costs of the house 1 is calculated can be set as appropriate. In the present embodiment, it is preferably the same period as the period during which the energy consumption performance is calculated (a predetermined period of 20 years after the installation of the solar power generation device).

[0094] In step S4 of the present embodiment, first, the energy consumption performance (the energy consumption performance for each year and the total energy consumption performance) input to the fourth storage unit 19d shown in FIG. 2 and the second calculation unit 20b included in the program unit 20 are read into the working memory 17.

[0095] The second calculation unit 20b is a program for calculating information on the heating and cooling costs of House 1 and / or information on the depreciation years of the solar power generation device (in this example, the second solar power generation device) 3e based on the energy consumption performance. By this second calculation unit 20b being executed by the arithmetic unit 15, the computer 14 can be made to function as means for calculating information on the heating and cooling costs of House 1 and / or information on the depreciation years of the solar power generation device 3e.

[0096] Information on the heating and cooling costs of House 1 can be calculated as appropriate. The information on the heating and cooling costs in this embodiment includes the predicted heating and cooling costs of House 1 (hereinafter sometimes referred to as "predicted heating and cooling costs"). These predicted heating and cooling costs can be calculated as appropriate. In this embodiment, the predicted heating and cooling costs (total predicted heating and cooling costs) can be calculated by subtracting the total predicted power selling revenue from the total predicted power buying expenditure.

[0097] The total predicted power buying expenditure can be obtained by summing up the predicted power buying expenditures for each year from the first year to the twentieth year after the solar power generation device (in this example, the second solar power generation device) 3e is installed. The predicted power buying expenditure for each year is calculated by multiplying the predicted power buying amount included in the energy consumption performance for each year calculated in step S3 by the predicted power buying unit price for each year. The predicted power buying unit price for each year can be set as appropriate according to, for example, the trend of the power buying unit price in recent years.

[0098] The total predicted power selling revenue can be obtained by summing up the predicted power selling revenues for each year from the first year to the twentieth year after the solar power generation device (in this example, the second solar power generation device) 3e is installed. The predicted power selling revenue for each year is calculated by multiplying the predicted power selling amount for each year by the predicted power selling unit price for each year. Note that the predicted power selling amount for each year is obtained by subtracting the predicted self-consumption power amount from the predicted power generation amount included in the energy consumption performance for each year calculated in step S3. Also, the predicted power selling unit price for each year can be set as appropriate according to, for example, the trend of the power selling unit price in recent years.

[0099] In this embodiment, fluctuations in future self-consumption power are reflected in the annual energy consumption performance (predicted power generation amount, predicted self-consumption power amount, and predicted power purchase amount) used for calculating the predicted photothermal cost (total predicted photothermal cost). By using these energy consumption performances, a predicted photothermal cost that reflects fluctuations in future self-consumption power can be calculated.

[0100] Information regarding the depreciation period of the solar power generation device (in this example, the second solar power generation device) 3e can be appropriately calculated. The information regarding the depreciation period in this embodiment includes the predicted depreciation period of the solar power generation device 3e (hereinafter, sometimes referred to as the "predicted depreciation period").

[0101] The predicted depreciation period can be appropriately calculated. In this embodiment, the predicted depreciation period is obtained by adding the average value per year of the total predicted power sales revenue and the average value per year of the total predicted self-consumption amount, and then excluding the initial introduction cost of the solar power generation device (in this example, the second solar power generation device) 3e.

[0102] The calculation procedure for the total predicted power sales revenue in this embodiment is as described above. The total predicted self-consumption amount in this embodiment can be obtained by summing up the predicted self-consumption amounts for each year from the first year to the twentieth year after the solar power generation device (in this example, the second solar power generation device) 3e is installed. The predicted self-consumption amount for each year can be calculated by multiplying the predicted self-consumption power amount included in the annual energy consumption performance calculated in step S3 by the predicted power purchase unit price for each year. The predicted power purchase unit price for each year is as described above.

[0103] In this embodiment, fluctuations in future self-consumption power are reflected in the annual energy consumption performance (predicted power generation amount and predicted self-consumption power amount) used for calculating the predicted depreciation period. By using these energy consumption performances, a predicted depreciation period that reflects fluctuations in future self-consumption power can be calculated. Information regarding the photothermal cost of House 1 and / or information regarding the depreciation period of the solar power generation device 3e is stored in the fifth storage unit 19e (computer 14) shown in FIG. 2.

[0104] [Output information regarding the heating and cooling costs of the house and / or information regarding the depreciation years of the solar power generation device] Next, in the proposed method of this embodiment, the computer 14 (shown in FIG. 2) outputs information regarding the heating and cooling costs of the house 1 and / or information regarding the depreciation years of the solar power generation device (in this example, the second solar power generation device) 3e (step S5). In this embodiment, both the information regarding the heating and cooling costs of the house 1 and the information regarding the depreciation years of the solar power generation device 3e are output, but only one of these may be output as necessary.

[0105] In step S5 of this embodiment, first, the information regarding the heating and cooling costs of the house 1 and / or the information regarding the depreciation years of the solar power generation device (in this example, the second solar power generation device) 3e stored in the fifth storage unit 19e shown in FIG. 2 is read into the working memory 17. Further, the output unit 20e included in the program unit 20 is read into the working memory 17.

[0106] The output unit 20e is a program for outputting information regarding the heating and cooling costs of the house 1 and / or information regarding the depreciation years of the solar power generation device 3e. By this output unit 20e being executed by the arithmetic unit 15, the computer 14 can be made to function as means for outputting information regarding the heating and cooling costs of the house 1 and / or information regarding the depreciation years of the solar power generation device 3e.

[0107] FIG. 5 is a diagram showing an example of a screen 33 on which information regarding the heating and cooling costs of the house (hereinafter sometimes referred to as "information regarding the heating and cooling costs") 31 and information regarding the depreciation years of the solar power generation device (hereinafter sometimes referred to as "information regarding the depreciation years") 32 are output. In this embodiment, the installed capacity 34 of the solar power generation device, the total predicted power purchase expenditure 35, and the total predicted power sale revenue 36 are further displayed, but it is not limited to such a mode, and some of these may be omitted as necessary, or other information may be displayed.

[0108] FIG. 5 shows a first result 41 calculated in consideration of a second design factor 22 (reduction in the number of occupants and addition of an EV outlet), and a second result 42 calculated without considering the second design factor.

[0109] For the first result 41, the results calculated in step S4 (total predicted electricity purchase expenditure, total predicted electricity sale revenue, predicted heat and light cost, and predicted payback years) are used. On the other hand, the second result can be easily calculated, for example, from the energy consumption performance (including predicted power generation amount, predicted self-consumption electricity amount, and predicted electricity purchase amount) based only on the first design factor 21.

[0110] In the example of this embodiment, compared with the second result 42 without considering the second design factor 22 (reduction in the number of occupants and addition of an EV outlet), in the first result considering the second design factor 22, the predicted heat and light cost over 20 years and the predicted payback years are reduced. Therefore, by considering the variation in future self-consumption electricity amount based on the second design factor 22, the merits of installing the solar power generation device 3e can be more clearly shown.

[0111] In this embodiment, by displaying the first result 41 and the second result 42, it becomes possible to compare the information 31 regarding the heat and light cost and the information 32 regarding the payback years before and after the determination of the second design factor 22. Thereby, in the proposed method of this embodiment, it becomes possible to evaluate the merits or demerits of the solar power generation device 3e considering the variation in future self-consumption electricity amount.

[0112] In step S5, an evaluation result 37 regarding the merits or demerits of the solar power generation device 3e may be output. This evaluation result 37 can be appropriately output using the first result 41 and the second result 42. By outputting such an evaluation result 37, it becomes easier to explain the merits or demerits of the solar power generation device 3e to the target person (for example, the donor or owner of the house 1, etc.).

[0113] A decrease in the expected photothermal cost and the expected depreciation years over 20 years is expected, and when the installation amount of the solar power generation device 3e is increased, the merits such as a further decrease in the expected photothermal cost become greater, an evaluation result 37 may display a message proposing an increase in the installation amount. On the other hand, when the demerits are significant for the target person (for example, the donor or owner of House 1, etc.), an evaluation result 37 may display a message proposing a decrease in the installation amount. This enables the target person to select an appropriate installation amount of the solar power generation device 3e.

[0114] [Determine whether the target person wishes to change the installation amount of the solar power generation device] Next, in the proposed method of this embodiment, the computer 14 shown in FIG. 2 determines whether the target person (for example, the donor or owner of House 1, etc.) wishes to change the installation amount of the solar power generation device 3e based on the output information shown in FIG. 5 (step S6). The output information includes the information 31 regarding the photothermal cost and / or the information 32 regarding the depreciation years shown in FIG. 5.

[0115] In step S6 of this embodiment, the determination unit 20f included in the program unit 20 shown in FIG. 2 is read into the work memory 17.

[0116] The determination unit 20f is a program for determining whether the target person (for example, the donor or owner of House 1, etc.) wishes to change the installation amount of the solar power generation device 3e based on the output information (the information 31 regarding the photothermal cost and the information 32 regarding the depreciation years shown in FIG. 5). By this determination unit 20f being executed by the arithmetic unit 15, the computer 14 can function as a means for determining whether the target person wishes to change the installation amount of the solar power generation device 3e.

[0117] FIG. 6 is a diagram showing an example of a screen 45 used to determine whether a subject wishes to change the installation amount of the solar power generation device 3e (shown in FIG. 1). On the screen 45, a first button 47 for pressing when wishing to change the installation amount and a second button 48 for pressing when not wishing to change the installation amount are displayed. By pressing either one of these first button 47 and second button 48, it can be easily determined whether or not to wish to change the installation amount.

[0118] Further, the screen 45 further includes an increase / decrease selection unit 50 for selecting the increase / decrease amount from the current installation amount when wishing to change the installation amount. With such an increase / decrease selection unit 50, it becomes possible to specify the installation amount desired by the subject (for example, the donor or owner of the house 1, etc.). Also, the increase / decrease selection unit 50 is displayed as a check box, for example, but is not particularly limited, and may be, for example, a pull-down menu (not shown) that can select any installation amount.

[0119] The increase / decrease selection unit 50 of the present embodiment includes a first selection unit 50a, a second selection unit 50b, a third selection unit 50c, a fourth selection unit 50d, and a fifth selection unit 50e, but is not particularly limited. For example, a part of the first selection unit 50a to the fifth selection unit 50e may be omitted, or other selection units (not shown) may be added. Also, in the increase / decrease selection unit 50 of the present embodiment, only one of the first selection unit 50a to the fifth selection unit 50e can be selected.

[0120] The first selection unit 50a is selected when the subject (e.g., the donor or owner of House 1, etc.) wishes to reduce the current installed capacity by 0.5 kW. The second selection unit 50b is selected when the subject wishes to increase the current installed capacity by 0.5 kW. The third selection unit 50c is selected when the subject wishes to increase the current installed capacity by 1.0 kW. The fourth selection unit 50d is selected when the subject wishes to increase the current installed capacity by 1.5 kW. The fifth selection unit 50e is selected when the subject wishes to increase the current installed capacity by 2.0 kW. In the example of FIG. 6, the second selection unit 50b (increase by 0.5 from the current installed capacity) is selected.

[0121] In step S6, when the increase / decrease selection unit 50 (any one of the first selection unit 50a to the fifth selection unit 50e) is selected and the first button 47 is pressed, it is determined that the subject wishes to change the installed capacity of the solar power generation device 3e (in step S6, "Yes"). In this case, the changed installed capacity (the installed capacity obtained by integrating the current installed capacity and the increase / decrease amount) is stored in the third storage unit 19c shown in FIG. 2.

[0122] In the example of FIG. 6, since an increase of 0.5 kW is desired from the installed capacity (5.5 kW) of the second solar power generation device, the installed capacity (6.0 kW) of the third solar power generation device is stored in the third storage unit 19c. Then, based on the changed installed capacity, step S7 of recalculating the energy consumption performance is performed.

[0123] On the other hand, in step S6, when the second button 48 is pressed, it is determined that the subject does not wish to change the installed capacity of the solar power generation device 3e (in step S6, "No"). In this case, based on the installed capacity (in this example, 5.5 kW) of the solar power generation device 3e used in the calculation of the energy consumption performance, the solar power generation device 3e is installed in House 1 (step S8).

[0124] In the proposed method (proposal system 10) of this embodiment, as shown in FIG. 5, it is possible to output information 31 regarding the light and heat cost reflecting the future variation in the amount of self-consumed power and / or information 32 regarding the depreciation years. With this information, in the proposed method of this embodiment, it is possible to present the merits or demerits of the solar power generation device 3e to the target person (for example, the donor or owner of House 1, etc.) considering the future variation in the amount of self-consumed power. As a result, the target person can evaluate the merits or demerits of the solar power generation device 3e in advance, and furthermore, based on those evaluations, can flexibly change the installation amount of the solar power generation device 3e. Therefore, in the proposed method of this embodiment, it is possible to propose a solar power generation device 3e that is highly acceptable to the target person.

[0125] [Recalculate the energy consumption performance based on the changed installation amount] Next, in the proposed method of this embodiment, the computer 14 (shown in FIG. 2) recalculates the energy consumption performance based on the changed installation amount of the solar power generation device 3e (step S7). In the example of this embodiment, since an increase of 0.5 kW is desired from the installation amount (5.5 kW) of the second solar power generation device, the energy consumption performance is calculated based on the installation amount (6.0 kW) of the third solar power generation device.

[0126] In step S7 of this embodiment, first, the first design factor 21 (shown in FIG. 1) stored in the first storage unit 19a shown in FIG. 2 and the second design factor 22 (shown in FIG. 4) stored in the second storage unit 19b are read into the working memory 17. Further, the changed installation amount of the solar power generation device 3e (the installation amount (6.0 kW) of the third solar power generation device) stored in the third storage unit 19c is read into the working memory 17.

[0127] Furthermore, the first calculation unit 20a included in the program unit 20 is read into the working memory 17. The first calculation unit 20a is a program for recalculating the energy consumption performance for a predetermined period after the installation of the solar power generation device (in this example, the third solar power generation device) 3e based on the changed installation amount. By the first calculation unit 20a being executed by the arithmetic unit 15, the computer 14 can be made to function as a means for recalculating the energy consumption performance.

[0128] In step S7 of the present embodiment, the energy consumption performance is recalculated in the same procedure as in step S3 for calculating the energy consumption performance. That is, among the first design factor 21 (information regarding the outer skin 2 etc.) and the second design factor 22 (reduction in the number of occupants and addition of EV outlets) used for the calculation of the energy consumption performance, the installation amount of the solar power generation device 3e is updated to the changed installation amount (6.0 kW). Then, based on the first design factor 21 and the second design factor 22 including the updated installation amount, the energy consumption performance is recalculated. Thereby, in step S7, based on the changed installation amount of the solar power generation device 3e, the energy consumption performance (the energy consumption performance for each year and the total energy consumption performance) can be recalculated. The calculated energy consumption performance is stored in the fourth storage unit 19d shown in FIG. 2.

[0129] [Recalculate information regarding the heating and cooling costs of the house and / or information regarding the depreciation years of the solar power generation device] Next, in the proposed method of the present embodiment, the computer 14 (shown in FIG. 2) recalculates information regarding the heating and cooling costs of the house and / or information regarding the depreciation years of the solar power generation device based on the recalculated energy consumption performance (step S9). In the present embodiment, both information regarding the heating and cooling costs of the house 1 and information regarding the depreciation years of the solar power generation device 3e are calculated, but only either one of these may be output. Also, the period during which the information regarding the heating and cooling costs of the house 1 is recalculated is preferably the same period as the period during which the energy consumption performance is recalculated.

[0130] In step S9 of the present embodiment, first, the recalculated energy consumption performance (energy consumption performance for each year and total energy consumption performance) input to the fourth storage unit 19d shown in FIG. 2 is read into the work memory 17. Further, the second calculation unit 20b included in the program unit 20 is read into the work memory 17.

[0131] The second calculation unit 20b is a program for recalculating information on the heat cost of the house 1 and / or information on the depreciation years of the solar power generation device (in this example, the third solar power generation device) 3e based on the recalculated energy consumption performance. By executing this second calculation unit 20b by the calculation unit 15, the computer 14 can function as means for recalculating information on the heat cost of the house 1 and / or information on the depreciation years of the solar power generation device 3e.

[0132] In step S9 of the present embodiment, based on the same procedure as in step S4, information on the heat cost of the house and / or information on the depreciation years of the solar power generation device are recalculated using the recalculated energy consumption performance.

[0133] In the present embodiment, the future variation in the self-consumption power amount and the changed installation amount of the solar power generation device 3e are reflected in the energy consumption performance (predicted power generation amount, predicted self-consumption power amount, and predicted power purchase amount) for each year used for recalculating the heat cost of the house. By using these energy consumption performances, the predicted heat cost reflecting both the future variation in the self-consumption power amount and the changed installation amount of the solar power generation device 3e can be recalculated.

[0134] In this embodiment, the energy consumption performance (predicted power generation amount and predicted self-consumption power amount) for each year used in the recalculation of the predicted depreciation years reflects the future fluctuations in the self-consumption power amount and the installed capacity of the changed solar power generation device 3e. By using these energy consumption performances, the predicted depreciation years reflecting both the future fluctuations in the self-consumption power amount and the installed capacity of the changed solar power generation device 3e can be recalculated. The information regarding the heat and light expenses of the house 1 after recalculation and / or the information regarding the depreciation years of the solar power generation device 3e is stored in the fifth storage unit 19e (computer 14) shown in FIG. 2.

[0135] [Output information regarding the heat and light expenses of the house after recalculation and / or information regarding the depreciation years of the solar power generation device] Next, in the proposed method of this embodiment, the computer 14 (shown in FIG. 2) outputs information regarding the heat and light expenses of the house 1 after recalculation and / or information regarding the depreciation years of the solar power generation device (in this example, the third solar power generation device) 3e (step S10). In this embodiment, both the information regarding the heat and light expenses of the house 1 and the information regarding the depreciation years of the solar power generation device 3e are output, but if necessary, only either one of these may be output.

[0136] In step S10 of this embodiment, first, the information regarding the heat and light expenses of the house 1 after recalculation and / or the information regarding the depreciation years of the solar power generation device (in this example, the third solar power generation device) 3e, which is input to the fifth storage unit 19e shown in FIG. 2, is read into the working memory 17. Further, the output unit 20e included in the program unit 20 is read into the working memory 17.

[0137] The output unit 20e is a program for outputting information regarding the heat and light expenses of the house after recalculation and / or information regarding the depreciation years of the solar power generation device. By this output unit 20e being executed by the arithmetic unit 15, the computer 14 can be made to function as means for outputting information regarding the heat and light expenses of the house after recalculation and / or information regarding the depreciation years of the solar power generation device.

[0138] FIG. 7 is a diagram showing an example of a screen 51 on which information 31 regarding the recalculated heating and cooling costs of a house and information 32 regarding the depreciation years of a solar power generation device are output. In the present embodiment, the installed capacity 34 of the solar power generation device, the total estimated purchased electricity expenditure 35, and the total estimated sold electricity revenue 36 are further displayed, but the present invention is not limited to such a mode, and some of these may be omitted or other information may be displayed as necessary.

[0139] In FIG. 7, a first result 41 and a third result 43 are displayed. Similar to the first result 41 shown in FIG. 5, the first result 41 is calculated in consideration of the second design factor 22 (reduction in the number of occupants and addition of an EV outlet) and the installed capacity before the change of the solar power generation device 3e (installed capacity of the second solar power generation device: 5.5 kW). On the other hand, the third result 43 is calculated in consideration of the second design factor 22 and the installed capacity after the change of the solar power generation device (installed capacity of the third solar power generation device: 6.0 kW).

[0140] In the third result of the present embodiment, compared with the first result, although the expected depreciation years slightly increase due to the increase in the installed capacity of the solar power generation device 3e, the expected heating and cooling costs decrease. Therefore, the merits of increasing the installed capacity of the solar power generation device 3e can be more clearly shown.

[0141] In step S10, an evaluation result 37 regarding the merits or demerits due to the increase or decrease in the installed capacity of the solar power generation device 3e may be output. The evaluation result 37 can be appropriately output using the first result 41 or the third result 43. By outputting such an evaluation result 37, it becomes easier to explain the merits or demerits of the solar power generation device 3e to the target person (for example, the donor or owner of the house).

[0142] [Determine whether the target person wishes to change the installed capacity of the solar power generation device] Next, in the proposed method of this embodiment, a process S6 in which the computer 14 shown in FIG. 2 determines whether the subject desires to change the installation amount of the solar power generation device 3e is performed again based on the output information shown in FIG. 7. The output information includes the information 31 regarding the heat and light cost and / or the information 32 regarding the depreciation years shown in FIG. 7.

[0143] In process S6, based on the above-described procedure, it is determined whether the subject (for example, the donor or owner of the house, etc.) desires to change the installation amount of the solar power generation device 3e. In this case, the screen 45 shown in FIG. 6 can be used to determine whether the subject desires to change the installation amount of the solar power generation device 3e.

[0144] If it is determined that the subject desires to change the installation amount of the solar power generation device 3e (Yes in process S6), the changed installation amount (the installation amount obtained by integrating the current installation amount and the increase or decrease) is stored in the third storage unit 19c shown in FIG. 2. Then, based on the changed installation amount, a process S7 of recalculating the energy consumption performance is performed again.

[0145] On the other hand, if it is determined that the subject does not desire to change the installation amount of the solar power generation device 3e (No in process S6), the solar power generation device 3e is installed in the house 1 based on the installation amount of the solar power generation device 3e used for recalculating the energy consumption performance (process S8).

[0146] In the proposed method (proposal system 10) of this embodiment, when the subject desires to change the installation amount of the solar power generation device 3e, the information 31 regarding the heat and light cost and / or the information 32 regarding the depreciation years are recalculated based on the changed installation amount, and the recalculation result is output. With these information, in the proposed method of this embodiment, it is possible to present to the subject the merits or demerits of the solar power generation device 3e considering the future variation in the amount of self-consumed electric power and the changed installation amount. Furthermore, the subject can repeatedly change the installation amount of the solar power generation device 3e. Thereby, it becomes possible to propose a more convincing solar power generation device 3e for the subject.

[0147] [Proposed Method for Solar Power Generation Device (Second Embodiment)] In the previous embodiments, when the target person desired to change the installation amount of the solar power generation device 3e (shown in FIG. 6) based on the output information shown in FIG. 5, the energy consumption performance was recalculated based on the changed installation amount, but it is not limited to such a mode.

[0148] For example, when the target person desires to change the second design factor 22 (shown in FIG. 4) based on the output information shown in FIG. 5, the energy consumption performance may be recalculated based on the changed second design factor 22. Further, the energy consumption performance may be recalculated based on both the changed installation amount of the solar power generation device 3e and the second design factor 22. Thereby, since the second design factor 22 is flexibly changed and the energy consumption performance is recalculated, it becomes possible to propose a solar power generation device 3e that is highly acceptable to the target person.

[0149] As described above, the particularly preferred embodiments of the present invention have been described in detail. However, the present invention is not limited to the illustrated embodiments and can be implemented in various modes.

[0150] [Appendix] The present invention includes the following aspects.

[0151] [Invention 1] A system for proposing a solar power generation device installed in a house to a target person, A first storage unit that stores a first design factor necessary for calculating energy consumption performance including the predicted power generation amount per unit period of each of a plurality of solar power generation devices with different installation amounts and the predicted self-consumption power amount, which is the predicted power consumption amount consumed in the house, A second storage unit that stores a second design factor, which is a factor that changes the predicted self-consumption power amount in the future and is determined by the target person or determined in advance, A first calculation unit that calculates the energy consumption performance for a predetermined period after the installation of the solar power generation device based on the first design factor and the second design factor, A second calculation unit that calculates information regarding the heating and cooling costs of the house and / or information regarding the depreciation years of the solar power generation device based on the energy consumption performance; An output unit that outputs the information, A proposal system for a solar power generation device. [Invention 2] The proposal system for a solar power generation device according to Invention 1, wherein the second design factor includes at least one of a factor that increases the predicted self-consumption power amount and a factor that decreases the predicted self-consumption power amount. [Invention 3] The proposal system for a solar power generation device according to Invention 2, wherein the factor that increases the predicted self-consumption power amount includes at least one addition of an EV outlet, a power storage device, and a heat pump water heater to the house. [Invention 4] The proposal system for a solar power generation device according to Invention 2 or 3, wherein the factor that increases the predicted self-consumption power amount includes an increase in the number of occupants in the house. [Invention 5] The proposal system for a solar power generation device according to any one of Inventions 2 to 4, wherein the factor that decreases the predicted self-consumption power amount includes a reduction in the number of occupants in the house. [Invention 6] The proposal system for a solar power generation device according to any one of Inventions 1 to 5, wherein the house is a newly constructed property for which construction is planned. [Invention 7] The proposal system for a solar power generation device according to any one of Inventions 1 to 5, wherein the house is an existing property. [Invention 8] Further includes a third storage unit that stores the changed installation amount when the subject desires to change the installation amount based on the output information, The first calculation unit recalculates the energy consumption performance based on the changed installation amount, The second calculation unit recalculates information regarding the heating and cooling costs of the house and / or information regarding the depreciation years of the solar power generation device based on the recalculated energy consumption performance. A proposal system for a solar power generation device according to any one of Inventories 1 to 7 of the present invention. [Inventive Concept 9] A method for proposing a solar power generation device installed in a house to a target person, inputting, into a computer, first design factors necessary for calculating energy consumption performance including the predicted power generation amount per unit period of each of a plurality of solar power generation devices with different installation amounts and the predicted self-consumption power amount which is the predicted power consumption amount consumed in the house; inputting, into the computer, second design factors which are a plurality of factors for varying the predicted self-consumption power amount determined by the target person or predetermined in advance; wherein the computer calculates the energy consumption performance for a predetermined period after installation of the solar power generation device based on the first design factor and the second design factor; calculates information regarding the heating and cooling costs of the house and / or information regarding the depreciation years of the solar power generation device based on the energy consumption performance; and outputs the information. A method for proposing a solar power generation device.

Description of Signs

[0152] 31 Information regarding the heating and cooling costs of the house 32 Information regarding the depreciation years of the solar power generation device

Claims

1. A system for proposing a solar power generation device to be installed in a house, comprising: a first storage unit that stores first design factors necessary for calculating energy consumption performance, including the predicted power generation amount per unit period of each of a plurality of solar power generation devices with different installation amounts and the predicted self-consumption power amount, which is the predicted power consumption amount consumed in the house; a second storage unit that stores a second design factor, which is a factor determined by the target person or determined in advance to vary the predicted self-consumption power amount in the future; a first calculation unit that calculates the energy consumption performance for a predetermined period after installation of the solar power generation device based on the first design factor and the second design factor; a second calculation unit that calculates information regarding the light and heat cost of the house and / or information regarding the depreciation years of the solar power generation device based on the energy consumption performance; and an output unit that outputs the information. A solar power generation device proposal system.

2. The solar power generation device proposal system according to claim 1, wherein the second design factor includes at least one of a factor that increases the predicted self-consumption power amount and a factor that decreases the predicted self-consumption power amount.

3. The solar power generation device proposal system according to claim 2, wherein the factor that increases the predicted self-consumption power amount includes addition of at least one of an EV outlet, a power storage device, and a heat pump water heater to the house.

4. The solar power generation device proposal system according to claim 2, wherein the factor that increases the predicted self-consumption power amount includes addition of the number of occupants in the house.

5. The solar power generation device proposal system according to claim 2, wherein the factor that decreases the predicted self-consumption power amount includes reduction of the number of occupants in the house.

6. The solar power generation device proposal system according to claim 1, wherein the house is a newly constructed property for which construction is planned.

7. The solar power generation device proposal system according to claim 1, wherein the house is an existing property.

8. The system further includes a third storage unit that stores the changed installation amount when the target person wishes to change the installation amount based on the output information, and the first calculation unit recalculates the energy consumption performance based on the changed installation amount. The second calculation unit recalculates information regarding the heating and cooling costs of the house and / or information regarding the depreciation years of the solar power generation device based on the recalculated energy consumption performance. The solar power generation device proposal system according to any one of claims 1 to 7.

9. A method for proposing a solar power generation device installed in a house to a target person, a step of inputting, into a computer, first design factors necessary for calculating energy consumption performance including the predicted power generation amount per unit period of each of a plurality of solar power generation devices having different installation amounts and the predicted self-consumption power amount which is the predicted power consumption amount consumed in the house; a step of inputting, into the computer, second design factors which are a plurality of factors for changing the predicted self-consumption power amount in the future, determined by the target person or determined in advance; wherein the computer calculates the energy consumption performance for a predetermined period after installation of the solar power generation device based on the first design factor and the second design factor; calculates information regarding the heating and cooling costs of the house and / or information regarding the depreciation years of the solar power generation device based on the energy consumption performance; and executes a step of outputting the information. A method for proposing a solar power generation device.

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