Battery charging control system

Abstract

To efficiently utilize a storage battery by reading a weather situation from measurement data.SOLUTION: The present invention relates to a storage battery charge control system 1 in which a solar cell and a commercial power source are connected to a storage battery. The storage battery charge control system comprises: a weather measurement section 15 capable of measuring weather information of at least one of a solar radiation amount, a humidity and an air pressure in a reference time zone and transmitting weather measurement data to a determination section; a determination section 16 capable of determining whether the weather measurement data in the reference time zone are equal to or more than a threshold or less than the threshold; and a control section capable of controlling the way of charging the storage battery. The control section starts control in such a manner the storage battery is charged by surplus photovoltaic generation power until a charge amount secure target time in a case where it is estimated from a determination result in the determination section that power generation of the solar cell is sufficiently performed, and starts control in such a manner that the storage battery is charged by commercial power until the charge amount target time in a case where it is not estimated from the determination result in the determination section that the power generation of the solar cell is sufficiently performed.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a battery charging control system.

Background Art

[0002] In a contract for the use of commercial power, usually, the basic charge is determined by the maximum demand value of the power (commercial power) from the commercial power source. The demand value means the average power consumed in 30 - minute units. The maximum demand value within a day is called the maximum demand value. For this reason, when using a battery charging control system using photovoltaic power as described in Patent Document 1, when the usage amount is likely to exceed the power set by the basic charge, it may be used to discharge from the battery to the load. By doing so, it is possible to prevent the amount of power used from the commercial power source from exceeding the value set by the basic charge. Thus, reducing the maximum demand value is called peak cutting.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

[0004] To enable such a thing, it is necessary to pre - charge the battery. Also, charging the battery can be considered using photovoltaic power and commercial power. When charging the battery with photovoltaic power, the power generation situation is affected by the weather. That is, there may be a case where the charging of the battery cannot be sufficiently performed. To avoid such a situation where charging is not sufficiently performed due to such reasons, it is conceivable to charge the battery with commercial power regardless of the weather. However, in this case, even on a day when there is excess photovoltaic power, the battery will be charged with commercial power, and the usage amount of commercial power will increase.

Summary of the Invention

Problems to be Solved by the Invention

[0005] The inventors of this invention have attempted to solve this problem by diligently considering it. The problem that this invention aims to solve is to enable efficient use of storage batteries by reading weather conditions from measurement data. [Means for solving the problem]

[0006] To solve the above problems, a battery charging control system is provided, comprising a solar cell capable of supplying generated solar power to a battery and a load, a commercial power source capable of supplying commercial power to a battery and a load, and a battery capable of supplying charging power to a load, the system comprising a weather measurement unit capable of measuring at least one weather information such as solar radiation, humidity, and atmospheric pressure during a reference time period and transmitting the weather measurement data to a determination unit, a determination unit capable of determining whether the weather measurement data during the reference time period is above or below a threshold, and a control unit capable of controlling the method of charging the battery, wherein the control unit starts controlling the charging of the battery until the target time for securing the charge amount using the surplus solar power if it is expected that the solar cell will generate sufficient power based on the determination result of the determination unit, and starts controlling the charging of the battery until the target time for securing the charge amount using commercial power if it is not expected that the solar cell will generate sufficient power based on the determination result of the determination unit.

[0007] Furthermore, it is preferable that the control unit be configured to start charging the battery using both the surplus solar power and commercial power if the solar power generation exceeds the load's power consumption after charging the battery has started using commercial power.

[0008] Furthermore, it is preferable to have a configuration in which the power consumption of the load can be measured during the standard time period or a time period earlier than the standard time period, and if the measured power consumption is above a threshold, the determination unit determines whether the weather measurement data for the standard time period is above or below the threshold, and if the measured power consumption is below the threshold, it outputs a signal to the control unit to charge the storage battery with the surplus power generated by solar power.

[0009] Furthermore, if the determination unit determines that the weather measurement data for the reference time period is below a threshold, it is preferable that the discharge amount from the battery to the load remains constant from a predetermined time after the target time for securing the charge amount until the final time of desired use of the stored energy, and that the control unit controls the discharge amount so that the charge amount of the battery reaches a set value at the final time of desired use of the stored energy.

[0010] Furthermore, a battery charging control system is provided, comprising a solar cell capable of supplying generated solar power to a battery and a load, a commercial power source capable of supplying commercial power to a battery and a load, and a battery capable of supplying charging power to a load, the system comprising: a weather measurement unit capable of measuring at least one weather information such as solar radiation, humidity, and atmospheric pressure during a reference time period and transmitting weather measurement data to a determination unit; a determination unit capable of determining whether there will be a surplus of solar power using the weather measurement data of the weather information during the reference time period and predicted data of the power consumption of the load after the reference time period; and a control unit capable of controlling the method of charging the battery, wherein the control unit controls the system to start charging the battery with the surplus solar power until the target time for securing the charge amount when it is expected that there will be a surplus of solar power based on the determination result of the determination unit, and controls the system to start charging the battery with commercial power until the target time for securing the charge amount when it is not expected that there will be a surplus of solar power based on the determination result of the determination unit.

[0011] Furthermore, it is preferable to have a storage unit that stores past weather conditions during a reference time period, past solar power generation after the reference time period, and past load power consumption after the reference time period, and to compare the weather measurement data for the current day during the reference time period with the solar power generation after the reference time period on past days with similar weather conditions, and the load power consumption measured at the same time as the measurement of the solar power generation. If the solar power generation is greater than the load power consumption, it is preferable to control the system as if a surplus of solar power generation is expected, and if the solar power generation is less than the load power consumption, it is preferable to control the system as if no surplus of solar power generation is expected. [Effects of the Invention]

[0012] This invention makes it possible to read weather conditions from measurement data and utilize storage batteries efficiently. [Brief explanation of the drawing]

[0013] [Figure 1] This is a block diagram of a battery charging control system in an embodiment. [Figure 2] This graph shows an example of the daily trends in power consumption, solar power generation, and battery charging / discharging, with the standard time period and target time for ensuring sufficient charge indicated. However, this is an example for a sunny day, with the solid line representing power consumption, the dashed line representing solar power generation, and the dotted line representing battery charging / discharging. [Figure 3] This graph shows an example of the daily trends in power consumption, solar power generation, and battery charging / discharging, with the standard time period, target time for securing charge, and desired final time for using the stored energy indicated. However, this is an example of a day with poor weather, and the solid line represents power consumption, the dashed line represents solar power generation, and the dotted line represents battery charging / discharging. [Figure 4] This is a diagram illustrating an example of a control flow. [Modes for carrying out the invention]

[0014] Embodiments for carrying out the invention are shown below. As can be seen from Figures 1 to 4, the battery charging control system 1 of this embodiment is connected to a battery 11 that can supply charging power to the load 12, and includes a solar cell 13 capable of supplying generated solar power (PV power) to a battery 11 and a load 12, and a commercial power supply 14 capable of supplying commercial power to the battery 11 and a load 12. Furthermore, this battery charging control system 1 includes a weather measurement unit 15 capable of measuring at least one weather information such as solar radiation, humidity, and atmospheric pressure in a reference time period t1 and transmitting the weather measurement data to a determination unit 16, a determination unit 16 capable of determining whether the weather measurement data in the reference time period t1 is above or below a threshold, and a control unit capable of controlling the method of charging the battery 11. Furthermore, the control unit is configured to start controlling the charging of the battery 11 using surplus solar power if the determination result from the determination unit 16 indicates that sufficient power generation from the solar cells 13 is expected. Conversely, if the determination result from the determination unit 16 indicates that sufficient power generation from the solar cells 13 is not expected, the control unit starts controlling the charging of the battery 11 using commercial power until the target time t2. This makes it possible to read weather conditions from measurement data and utilize the battery 11 efficiently.

[0015] Here, we will describe an example configuration of the battery charging control system 1 of the embodiment. In the example shown in Figure 1, power can be supplied to the load 12 from the commercial power supply 14, the solar cell 13, and the battery 11. In addition, a line that branches off from the line connecting the load 12 and the commercial power supply 14 is further branched so that power can be supplied to the load 12 from the solar cell 13 and the battery 11.

[0016] In the battery charging control system 1 shown in Figure 1, a solar power conditioner control unit 31 (solar PCS control unit) is provided between the solar cell 13 and the load 12 to control the solar power generated by the solar cell 13. In addition, this battery charging control system 1 is provided with a battery power conditioner control unit 33 (battery PCS control unit) between the battery 11 and the load 12 and the commercial power supply 14 to control the power stored in the battery 11 and the stored power.

[0017] The battery charging control system 1 includes a weather measurement unit 15 capable of measuring weather information, and a determination unit 16 capable of making decisions based on the results measured by the weather measurement unit 15. Furthermore, the battery charging control system 1 shown in Figure 1 includes a storage unit 21 capable of storing information. It also includes a power measurement unit 23 capable of measuring power.

[0018] The result determined by the determination unit 16 can influence some of the operation of the solar power conditioner control unit 31 and the battery power conditioner control unit 33. For example, the amount of solar radiation is measured by the measuring instrument provided in the weather measurement unit 15, and it is determined whether the value of the solar radiation is above or below a threshold. If it is above the threshold, it is considered good weather, and the system controls the system to use the surplus power, which is the generated power minus the power used, to charge the battery 11. In this example, commercial power is not used at all to charge the battery 11. Note that the amount of solar radiation is higher when the weather is good and lower when the weather is bad. For example, 200 W / m 2 For example, a threshold value can be used, and if it is above this value, the battery charging control system 1 can be controlled assuming that the weather is good and sufficient power generation from the solar panels is expected. If it is below this value, the battery charging control system 1 can be controlled assuming that the weather is bad and sufficient power generation from the solar panels is not expected.

[0019] What is measured by the weather measurement unit 15 does not have to be the solar radiation amount. For example, the atmospheric pressure may be measured. Specifically, the atmospheric pressure is measured by a measuring instrument, and it is determined whether the atmospheric pressure is above or below a threshold value. If it is above the threshold value, it is assumed that the weather is good and sufficient power generation by the solar cell will be performed, and it can be exemplified that the surplus power obtained by subtracting the used power from the generated power is used to charge the storage battery 11. In this example, commercial power is not used at all for charging the storage battery 11. Note that the atmospheric pressure is high when the weather is good and low when the weather is bad.

[0020] Also, the humidity may be measured by the weather measurement unit 15. Specifically, the humidity is measured by a measuring instrument, and it is determined whether the humidity is above or below a threshold value. If it is below the threshold value, it is assumed that the weather is good and sufficient power generation by the solar cell will be performed, and it can be exemplified that the surplus power obtained by subtracting the used power from the generated power is used to charge the storage battery 11. In this example, commercial power is not used at all for charging the storage battery 11. Note that the humidity is low when the weather is good and high when the weather is bad. For example, taking 65% as the threshold value, if it is less than that, the storage battery charging control system 1 is controlled assuming good weather, and if it is more than that, it is controlled assuming bad weather. However, in the case of humidity, since it may vary greatly depending on the season, it is preferable to set a threshold value according to the season.

[0021] Of course, it is not necessary that only one thing is measured. A plurality of types of data may be measured, and the combination thereof may be used to estimate whether the weather is good or bad. For example, when a plurality of items such as solar radiation amount + humidity + atmospheric pressure are used as determination conditions, if all items are on the side where it is determined that the weather is good based on the threshold value, it may be estimated that the weather is good and sufficient power generation by the solar cell will be performed. In this case, even if there is only one item that is not on the side where it is determined that the weather is good, it is determined that sufficient power generation by the solar cell is not expected, but the determination does not have to be like this.

[0022] Since meteorological measurement data serves as a standard for the daily electricity usage method, it is preferable to use data over a certain period rather than instantaneous data. Therefore, it is better to measure multiple times within a certain time period.

[0023] The reference time period t1 may be any time period during which the rechargeable battery 11 can be charged using commercial power before the power consumption reaches its peak. However, it is preferable to set the reference time period t1 based on "around the time when solar power generation starts with good weather" or "the time period when the morning power consumption starts to increase". In the example shown in Figure 2, the 30-minute period from 8:30 am to 9:00 am is set as the reference time period t1.

[0024] In the example shown in Figure 2, the weather is good, and the solar power generation gradually increases until after noon, gradually decreases from around 15:00, and there is no power generation at around 18:00. Also, considering the balance with power consumption, the power consumption exceeds the solar power generation from around 8:00 to around 10:30. Also, from around 10:30 to around 17:00, the solar power generation exceeds the power consumption. That is, surplus power is generated from around 10:30 to around 17:00.

[0025] Also, in this example, the rechargeable battery 11 is being charged from around 10:30. This is because when it is expected that the solar power generation by the solar cell 13 will be sufficient based on the determination result by the determination unit 16, the charging of the rechargeable battery 11 until the charge amount ensuring target time t2 is controlled to be performed with the surplus of the solar power generation (PV power - power consumption).

[0026] In the example shown in Figure 2, the time period with relatively high power consumption is also the time period with sufficient solar power generation, and the peak of power consumption is on a day when there is no need to worry. Therefore, the power stored in the rechargeable battery 11 is used by the load 12 to bridge the difference between the solar power generation and the power consumption from when the power consumption exceeds the solar power generation. In this example, the rechargeable battery 11 may be fully charged, and most of the power used after 10:30 is supplied from sources other than the commercial power supply 14.

[0027] Of course, it's not always sunny. In the example shown in Figure 3, it's a day with bad weather, and the solar panels 13 aren't generating much power. Even so, peak power consumption can exceed 40kW, so peak shaving is desired. Therefore, on days when power consumption is not high, it's desirable to send power from the commercial power source 14 to the battery 11 and store it. Here, after checking the weather at the reference time t1, power is sent from the commercial power source 14 to the battery 11 from around 9am to store it. However, power is only sent from the commercial power source 14 to the battery 11 until the target time t2 for securing the charge amount, after which the power stored in the battery 11 is gradually released so that it can be used by the load 12. The target time t2 for securing the charge amount should be set to a time before the peak time. In the example shown in Figure 3, the target time t2 for securing the charge amount is set to the time immediately before the peak time.

[0028] In this case, it is preferable to control the amount of power released from the battery 11 (the amount supplied to the load 12) to remain approximately constant from a predetermined time until the desired final time of use of the stored energy t3. This is because it allows for stable suppression of the amount of commercial power 14 used. In the example shown in Figure 3, the control is set to remain approximately constant from the target time of securing the charge amount t2 until the desired final time of use of the stored energy t3. It is preferable to set the desired final time of use of the stored energy t3 to the time when the peak of power consumption by the load 12 is expected to end.

[0029] Furthermore, in order to enable this, it is preferable that, when the determination unit 16 determines that the weather measurement data for the reference time period t1 is below a threshold, the discharge amount from the battery 11 to the load 12 becomes constant from a predetermined time after the target time for securing the charge amount t2 until the final desired time for using the stored energy t3, and the control unit controls the discharge amount so that the charge amount of the battery 11 reaches a set value at the final desired time for using the stored energy t3.

[0030] In this embodiment, some power remains in the battery 11 at the final desired time t3 for power utilization, enabling a response to sudden power shortages. The setting value for the capacity to remain in the battery 11 can be determined according to the desired capacity. Setting this value to 0 will use up all the power available in the battery 11, but considering emergency response, it is preferable that the setting value be greater than 0.

[0031] Incidentally, even if the weather forecast based on weather information measured during the reference time period t1 predicts unfavorable weather, it is possible that the weather may improve slightly after a few hours. For this reason, if the solar power generation exceeds the power consumption of the load 12 after charging the battery 11 has started using commercial power, it is preferable for the control unit to start charging the battery 11 using both the surplus solar power and commercial power. In this way, the use of commercial power in energy storage can be suppressed while achieving the target charge level.

[0032] Incidentally, whether or not it is necessary to store energy also depends on the amount of power consumed. For example, if power consumption is not expected to be very high, it may not be necessary to actively use the commercial power supply 14 for energy storage. For example, on weekends in a factory that mainly operates on weekdays, the amount of electricity used may be significantly less than on weekdays. For this reason, it is possible to check the power consumption, and if it is expected that power consumption will be low on that day, the system may be controlled not to use commercial power for energy storage, and instead to store any surplus solar power in the battery 11. On the other hand, if it is expected that power consumption will be high on that day, it is possible to determine whether or not to use commercial power for energy storage and to control the system according to the result of that determination.

[0033] To enable this, the battery charging control system 1 is capable of measuring the power consumption of the load 12 during a reference time period t1 or a time period earlier than the reference time period t1. If the measured power consumption is above a threshold, the determination unit 16 determines whether the weather measurement data for the reference time period t1 is above or below the threshold. If the measured power consumption is below the threshold, it is preferable to output a signal to the control unit to charge the battery 11 using the surplus solar power generation power.

[0034] Here, the embodiment will be explained following the flow shown in Figure 4. In the example shown in Figure 4, first it is determined whether the power consumption in the reference time period t1 is above a threshold (ST001). If the power consumption in the reference time period t1 is above a threshold, it is determined whether the amount of power generated by the solar cell 13 is expected to be sufficient, in order to actively perform peak shaving on the power consumption for that day (ST002).

[0035] If it is determined in step 002 that the amount of power generated by the solar cell 13 is expected to be sufficient, the surplus of solar power is used to charge the battery 11. Therefore, by subtracting the power consumed from the solar power, a basis for determining whether a surplus has occurred is derived. Based on the derived value, it is determined whether or not a surplus of solar power has occurred (ST003). If a surplus has occurred, the battery 11 is charged. If no surplus has occurred, the battery 11 is discharged so that the power can be used by the load 12.

[0036] In the example shown in Figure 4, if the power consumption during the reference time period t1 in step 001 is below the threshold, the surplus solar power is also used to charge the battery 11.

[0037] If it is determined in step 002 that the amount of power generated by the solar cell 13 is not expected to be sufficient, the battery 11 is charged using the commercial power supply 14 while power consumption is low. In the example shown in Figure 4, the charging speed is calculated to determine what rate of charging is necessary to charge the required amount by the target time t2. More specifically, the charging speed is derived by dividing the total amount of charge required by the time from the last time of the reference time period t1 to the target time t2 (ST004).

[0038] Subsequently, charging is performed according to the charging speed derived by calculation, but it is determined during charging whether the target time t2 for securing the charge amount has been reached (ST005). If it is determined in step 005 that the target time t2 for securing the charge amount has been reached, charging to the battery 11 is stopped, and during the demand peak time that occurs after the target time t2 for securing the charge amount, the battery 11 is discharged so that its power can be used by the load 12, thereby suppressing the use of the commercial power supply 14.

[0039] If it is not determined in step 005 that the target time t2 for securing the charge amount has been reached, it is determined whether the solar power generation exceeds the power consumption of the load 12 and whether a surplus has occurred (ST006). If it is determined in step 006 that no surplus has occurred, charging of the battery 11 continues using only commercial power. If it is determined in step 006 that a surplus has occurred, both commercial power and surplus power are used to charge the battery 11. Here, the amount of surplus power used to charge the battery 11 is subtracted from the power supplied from the commercial power source 14 to the battery 11, and the charging speed of the battery 11 is controlled to maintain the value derived in step 004.

[0040] Incidentally, the determination unit 16 and the control unit may determine the estimated amount of electricity generated by the solar cell 13 in a different manner than the example described above, and then determine the amount of charge from the commercial power supply 14 to the storage battery 11 based on that estimated amount.

[0041] For example, the determination unit 16 uses "weather measurement data of weather information in the reference time period t1" and "predicted power consumption data of the load 12 after the reference time period t1" to determine whether there will be a surplus of PV power. If the determination result indicates that there will be a surplus of PV power, the system controls the charging of the battery 11 to begin using the surplus solar power until the target time t2 for securing the charge amount. If the determination result from the determination unit 16 indicates that there will not be a surplus of PV power, the system controls the charging of the battery 11 to begin using commercial power until the target time t2 for securing the charge amount. Even in this way, it is possible to read the weather conditions from the measurement data and utilize the battery 11 efficiently.

[0042] Therefore, the battery charging control system 1, which includes a solar cell 13 capable of supplying generated solar power to the battery 11 and load 12, a commercial power supply 14 capable of supplying commercial power to the battery 11 and load 12, and a battery 11 capable of supplying charging power to load 12, includes a weather measurement unit 15 capable of measuring at least one weather information such as solar radiation, humidity, and atmospheric pressure during a reference time period t1 and transmitting weather measurement data to a determination unit 16, and uses the weather measurement data of the weather information during the reference time period t1 and the predicted power consumption data of the load 12 after the reference time period t1 to determine the surplus solar power generation power Preferably, the system includes a determination unit 16 capable of determining whether or not there will be a surplus in solar power generation, and a control unit capable of controlling how to charge the storage battery 11. The control unit controls the system to start charging the storage battery 11 with the surplus solar power generation when the determination result of the determination unit 16 indicates that there will be a surplus in solar power generation, and to start charging the storage battery 11 with commercial power when the determination result of the determination unit 16 indicates that there will not be a surplus in solar power generation.

[0043] Furthermore, it is preferable to have a storage unit 21 that stores "past weather conditions in the reference time period t1", "past solar power generation since the reference time period t1", and "past power consumption of the load 12 since the reference time period t1", and compare "solar power generation since the reference time period t1 on past days with weather conditions similar to the weather measurement data for the current day in the reference time period t1" with "power consumption of the load 12 measured at the same time as the measurement of the solar power generation". If the solar power generation is greater than the power consumption of the load 12, it is preferable to control the system as if a surplus of solar power generation is expected, and if the solar power generation is less than the power consumption of the load 12, it is preferable to control the system as if no surplus of solar power generation is expected. By doing so, the prediction data for the power consumption of the load 12 on the day to be determined by the determination unit 16 can be predicted with higher accuracy, and the determination unit 16 that uses that prediction data can make its determination with higher accuracy.

[0044] The present invention has been described above with reference to the embodiments, but the present invention is not limited to the above embodiments and can be implemented in various forms. For example, it is not necessary to control it in a flow manner. Of course, other controls can be combined, partially deleted, or rearranged as long as they do not contradict the spirit of the invention. In addition, a control unit may be provided separately from the solar power conditioner control unit or the battery power conditioner control unit. [Explanation of symbols]

[0045] 1. Battery charging control system 11. Storage batteries 12 loads 13 Solar Cells 14 Commercial power supply 15 Meteorological Measurement Department 16 Judgment section t1 Reference time zone t2 Target time to secure charging amount t3 Desired final time of electricity storage usage

Claims

1. A battery charging control system comprising a solar cell capable of supplying generated solar power to a battery and a load, a commercial power source capable of supplying commercial power to a battery and a load, and a battery capable of supplying charging power to a load, wherein the solar cell is connected to the battery. A weather measurement unit capable of measuring at least one weather information item, such as solar radiation, humidity, and atmospheric pressure, during a reference time period, and transmitting the weather measurement data to a judgment unit, A determination unit capable of determining whether weather measurement data during a reference time period is above or below a threshold, A control unit capable of controlling how the battery is charged, Equipped with, The control unit is If the determination unit determines that sufficient power generation from the solar panels is expected, it will begin controlling the system to charge the battery using the surplus solar power until the target time for securing the charge level. If the judgment unit determines that sufficient power generation from the solar panels is not expected, it will start controlling the system to charge the battery using commercial power until the target time for securing the charge level. It is possible to measure the power consumption of the load during the standard time period or a time period earlier than the standard time period. If the measured power consumption is above the threshold, the determination unit determines whether the weather measurement data for the reference time period is above or below the threshold. A battery charging control system that, when the measured power consumption is below a threshold, outputs a signal to the control unit to charge the battery using surplus solar power.

2. A battery charging control system comprising a solar cell capable of supplying generated solar power to a battery and a load, a commercial power source capable of supplying commercial power to a battery and a load, and a battery capable of supplying charging power to a load, wherein the solar cell is connected to the battery, A weather measurement unit capable of measuring at least one weather information item, such as solar radiation, humidity, and atmospheric pressure, during a reference time period, and transmitting the weather measurement data to a judgment unit, A determination unit capable of determining whether weather measurement data during a reference time period is above or below a threshold, A control unit capable of controlling how the battery is charged, Equipped with, The control unit is If the determination unit determines that sufficient power generation from the solar panels is expected, it will begin controlling the system to charge the battery using the surplus solar power until the target time for securing the charge level. If the judgment unit determines that sufficient power generation from the solar panels is not expected, it will start controlling the system to charge the battery using commercial power until the target time for securing the charge level. If the determination unit determines that the weather measurement data for the reference time period is below the threshold, A battery charging control system that controls the discharge rate in the control unit so that the discharge rate from the battery to the load remains constant from a predetermined time after the target time for securing the charge amount until the final time of desired use of the stored energy, and so that the charge amount of the battery reaches a set value at the final time of desired use of the stored energy.

3. A battery charging control system comprising a solar cell capable of supplying generated solar power to a battery and a load, a commercial power source capable of supplying commercial power to a battery and a load, and a battery capable of supplying charging power to a load, wherein the solar cell is connected to the battery. A weather measurement unit capable of measuring at least one weather information item, such as solar radiation, humidity, and atmospheric pressure, during a reference time period, and transmitting the weather measurement data to a judgment unit, A determination unit capable of determining whether there will be a surplus of solar power generation power using weather measurement data of weather information during a reference time period and predicted power consumption data of the load after the reference time period, A control unit capable of controlling how the battery is charged, Equipped with, The control unit is If the determination unit determines that there is a surplus of solar power, it controls the system to start charging the battery using the surplus solar power until the target time for securing the charge amount. If the determination unit determines that no surplus solar power is expected, the system will control the battery to begin charging using commercial power until the target time for securing the charge amount. It includes a storage unit that stores past weather conditions during a reference time period, past solar power generation since the reference time period, and past load power consumption since the reference time period. The weather measurement data for the day during the reference time period is compared with the solar power generated during the reference time period on past days with similar weather conditions, and the power consumption of the load measured at the same time as the measurement of the said solar power generation. If the amount of electricity generated by solar power is greater than the amount of electricity consumed by the load, the system will be controlled assuming that there will be a surplus of solar power. A battery charging control system that controls the system based on the assumption that there will be no surplus solar power if the amount of solar power generated is less than the amount of power consumed by the load.

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