Retrofit power outage prevention kit

Abstract

To provide a low-cost, easy-to-use emergency power supply facility and to easily take measures against the emergency power supply later. [Solution] The retrofit power outage countermeasure set, which is retrofitted to an existing distribution board 8, comprises a first main wiring 41 connecting a target branch switch 81 and a switch box 1, a second main wiring 42 connecting the switch box 1 and a specific load 9, a portable storage battery 2 attached to the switch box 1, and a portable solar power generation panel 3. The portable storage battery 2 stores electricity using power supplied from the target branch switch 81 when there is no power outage, and supplies electricity to the specific load 9 when there is a power outage. The portable storage battery 2 can also store electricity using the portable solar power generation panel 3. The portable storage battery 2 is equipped with a reverse power flow prevention circuit, or is provided with a reverse power flow detection unit 5 and a breaker 6.

Description

[Technical field]

[0001] The present invention relates to a retrofit power outage countermeasure kit that provides retrofit measures against power outages that may be caused by large-scale disasters. [Background technology]

[0002] In recent years, there have been frequent cases of natural disasters such as major earthquakes and floods causing severe damage to local lifelines, making it an urgent task to take thorough measures against these disasters. In particular, there have been many cases of large-scale blackouts caused by the destruction of power plants and damage to the power transmission and distribution grid, and the importance of taking measures against these situations is being emphasized. When a power outage occurs due to a disaster, it rarely takes a long time for power to be restored, but in many cases it takes several days. During that time, people are forced to live an inconvenient life without electricity. Many people evacuate to evacuation shelters equipped with emergency power supply equipment, but many hesitate to do so for privacy reasons and end up staying in their homes without electricity. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2023-154257 A Summary of the Invention [Problem to be solved by the invention]

[0004] In consideration of the above problems, measures are being taken to install emergency power supply equipment in ordinary homes in preparation for power outages during disasters. However, the installation must be done when the home is newly built, and there is a problem that it costs several million yen. Emergency power supply equipment for residential use generally includes solar panels and storage batteries. During normal times (non-power outages), the storage battery is charged with grid power (power supplied by the power company) and sunlight, and during disasters (power outages), the battery's power is used. In addition, there are cases where so-called V2H (Vehicle to Home) is installed, and equipment is installed so that electric vehicles or plug-in hybrid vehicles can be used as storage batteries. In any case, these conventional emergency power supply measures are very costly, require long construction periods, and are installed when a new house is built, so the reality is that they have not become widespread. The present invention was made with the issues of emergency power supply measures in the event of a disaster such as those described above in mind for ordinary homes, and aims to provide emergency power supply equipment that is low cost and easy to use, as well as to make it possible to easily implement emergency power supply measures even after construction of a home (even when the home is already occupied). [Means for solving the problem]

[0005] In order to solve the above problems, this specification discloses an invention of a retrofit power outage countermeasure set. The retrofit power outage countermeasure set according to the disclosed invention is a retrofit power outage countermeasure set that is retrofitted to an existing distribution board connected to a power grid, and is installed between a target branch switch, which is one of the branch switches in the distribution board, and a specific load in a facility in which the distribution board is installed, in a state in which power is supplied from the target branch switch to the specific load when there is no power outage. This set includes: a first main wiring connected to the target branch switch; a second main wiring connected to the specific load; a portable storage battery having an input terminal connected to a first main wiring, storing electricity via the first main wiring by power supplied from a target branch switch during a non-power outage, and being removable from the first main wiring; Solar panels and It is equipped with: The portable storage battery has an output terminal connected to the second main wiring in a state in which it is capable of supplying power to a specific load via the second main wiring during a power outage. The photovoltaic power generation panel is connected in parallel with the target branch switch on the input side of the portable storage battery. The portable storage battery is capable of storing electricity using power from both the target branch switch and the solar power generation panel connected in parallel, or is capable of storing electricity using power from either the target branch switch or the solar power generation panel. This retrofit power outage preparation set is a power outage preparation set that ensures power supply from the target branch switch to specific loads when the portable storage battery is powered by electricity from a solar power generation panel during non-power outages. In this retrofit power outage countermeasure kit, the portable storage battery is equipped with a reverse power flow prevention circuit to prevent stored power from being output from the input terminal. In order to solve the above problems, this specification discloses a retrofit power outage countermeasure set according to another invention. The power outage countermeasure set according to this other invention is a retrofit power outage countermeasure set that is retrofitted to an existing distribution board connected to a power grid, and is installed between a target branch switch, which is one of the branch switches in the distribution board, and a specific load in a facility in which the distribution board is installed, in a state in which power is supplied from the target branch switch to the specific load when there is no power outage. This set includes: a first main wiring connected to the target branch switch; a second main wiring connected to the specific load; a portable storage battery having an input terminal connected to a first main wiring, storing electricity via the first main wiring by power supplied from a target branch switch during a non-power outage, and being removable from the first main wiring; Solar panels and It is equipped with: The portable storage battery has an output terminal connected to the second main wiring in a state in which it is capable of supplying power to a specific load via the second main wiring during a power outage. The photovoltaic power generation panel is connected in parallel with the target branch switch on the input side of the portable storage battery. The portable storage battery is capable of storing electricity using power from both the target branch switch and the solar power generation panel connected in parallel, or is capable of storing electricity using power from either the target branch switch or the solar power generation panel. This retrofit power outage preparation set is a power outage preparation set that ensures power supply from the target branch switch to specific loads when the portable storage battery is powered by electricity from a solar power generation panel during non-power outages. And this retrofit power outage prevention kit is, a reverse current detection unit that detects reverse current of stored power output from an input terminal of the portable storage battery; a cutoff unit that cuts off the reverse flow power so that it does not flow into the power grid when the reverse flow detection unit detects a reverse flow; It is equipped with: In order to solve the above problems, the retrofit power outage countermeasure sets according to the disclosed inventions are as follows: The portable battery has a pass-through function. the portable storage battery is connected in series with the specific load to the first main wiring and is connected upstream of the specific load; The configuration may include a switch that connects the target branch switch and the specific load when the portable storage battery is removed from the first main wiring. In order to solve the above problems, the retrofit power outage countermeasure sets according to the disclosed inventions are as follows: a portable battery is connected in parallel with the specific load to the first main wiring; A switch is provided to disconnect the specific load from the first main wiring during a power outage and connect the portable battery to the specific load via the second main wiring to supply power. It may have the following configuration. In order to solve the above problems, the solar power generation panel in the retrofit power outage countermeasure set according to each of the disclosed inventions may be portable. Effect of the Invention

[0006] As described below, according to the retrofit power outage countermeasure kit according to each of the disclosed inventions, power is supplied to a specific load during a power outage from a portable storage battery that has been charged during normal times (when there is no power outage), so electricity can be used by the specific load until the amount of power stored in the portable storage battery becomes zero. This makes it possible to use the minimum amount of electricity necessary during a disaster, etc. In addition, construction can be completed cheaply and in a short period of time, and the cost of the hardware can be significantly reduced. This makes it possible to implement low-cost power outage countermeasures in the event of a disaster. And since the portable battery can be removed and used for outdoor leisure activities, it kills two birds with one stone. There is another reason why the battery is portable: in the event of a power outage, it can be taken to another location indoors and used as needed. Furthermore, since it is equipped with a solar power generation panel and can store electricity in a portable storage battery, it is possible to extend the time until the portable storage battery runs out of power during a power outage, which is particularly suitable for long-term power outages.

[0007] In addition, according to the retrofit power outage countermeasure set of the disclosed invention, the portable storage battery has a built-in reverse power flow prevention circuit to prevent the stored power from being output from the input terminal, preventing the stored power from accidentally flowing into the grid. This makes it possible to use the solar power generation panel as a completely self-consumption type power generation facility while taking measures against emergency power in the event of a power outage, and since no power application is required, it is an ideal product that can be easily introduced. In addition, according to another disclosed invention, a retrofit power outage countermeasure set is provided with a reverse current detection unit that detects the reverse flow of stored power output from the input terminal of the portable storage battery, and a cutoff unit that cuts off the reverse current power so that it does not flow into the power grid when the reverse current detection unit detects reverse current, so that even if the portable storage battery does not have a reverse current prevention circuit, reverse current power will not flow to the grid. Therefore, it is possible to use a solar power generation panel as a completely self-consumption power generation facility and take emergency power measures in the event of a power outage without having to worry about the type of portable storage battery, and since no power application is required, it is an ideal product that can be easily introduced.

[0008] In addition, if the portable storage battery has a pass-through function, is connected in series with the specific load to the first main wiring and is connected upstream of the specific load, and a switch is provided that short-circuits the target branch switch and the specific load when the portable storage battery is removed from the first main wiring, the power supply to the specific load is maintained even when the portable storage battery is removed, and the effect is achieved that no problems occur with power usage in the specific load.

[0009] In addition, in a configuration in which the portable storage battery is connected in parallel with the specific load to the first main wiring and a switch is provided to disconnect the specific load from the first main wiring in the event of a power outage and connect the portable storage battery to the specific load via the second main wiring to supply power, power supply to the specific load is maintained even when the portable storage battery is removed, thereby achieving the effect of eliminating problems with power usage at the specific load, and enabling the portable storage battery to supply power to the specific load in the event of a power outage. Furthermore, if the solar power generation panel is portable, retrofitting is extremely easy, and the solar power generation panel can also be used for leisure activities and other outings. [Brief description of the drawings]

[0010] [Figure 1]1 is a schematic diagram of a retrofit power outage countermeasure set according to a first embodiment. [Diagram 2] 11 is a schematic diagram showing the wiring state when the portable storage battery is removed. FIG. [Diagram 3] FIG. 2 is a schematic diagram showing an example of the configuration of an automatic switch. [Figure 4] FIG. 11 is a schematic diagram of a retrofit power outage countermeasure set according to a second embodiment. [Diagram 5] FIG. 13 is a schematic diagram of a retrofit power outage countermeasure set according to a third embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Next, a description will be given of a mode for carrying out the present invention (hereinafter, referred to as an embodiment) Fig. 1 is a schematic diagram of a retrofit power outage countermeasure set according to a first embodiment. The retrofit power outage countermeasure set shown in FIG. 1 is a set that retrofits a function to secure a power source using a storage battery when a power outage occurs. "Retrofit" means that it can be added after construction is completed, not when a building is newly constructed. As shown in FIG. 1, this retrofit power outage countermeasure set (hereinafter, abbreviated as retrofit set) is composed of a switch box 1, a portable storage battery 2, a solar power generation panel 3, main wiring 41, 42, etc. The switch box 1 is provided with a main line terminal 100 and a load terminal 101. The retrofit set of the embodiment described below is assumed to be for residential use such as a detached house or an apartment, but may also be used in non-residential buildings such as offices and public offices.

[0012] As shown in FIG. 1, this retrofit set is attached to one branch switch 81 in an existing distribution board 8 installed in a facility such as a house. As is well known, the distribution board 8 is connected to a power transmission and distribution network provided by a power company to receive power supply. The retrofit set is installed in a form interposed between the one branch switch 81 and a specific load 9 fed by the one branch switch 81. Therefore, during installation, the power feed line to the specific load 9 is removed from the one branch switch 81, one end of the first main wiring 41 is connected to the branch switch 81, and the other end of the first main wiring 41 is connected to a main line terminal 100 on the switch box 1. In addition, one end of the second main wiring 42 is connected to a load terminal 101 on the switch box 1, and the other end is connected to the specific load 9.

[0013] In the following description, the branch switch 81 to which the retrofit set is attached is referred to as the target branch switch. The specific load 9 to which the target branch switch 81 supplies power is a load to which power is supplied by the portable storage battery 2 during a power outage. In a facility such as a house, power is distributed to each room by a distribution board 8, and as the specific load 9, a room that has a high priority for power supply during a power outage (for example, the living room) is selected. In other words, the target branch switch 81 that supplies power to a room that has a high priority for power supply during a power outage is disconnected and the retrofit set is installed.

[0014] The retrofit set of the first embodiment is basically configured such that the portable storage battery 2 is interposed in series between the target branch switch 81 and the specific load 9. That is, the input terminal 21 of the portable storage battery 2 is connected to the target branch switch 81 by the first main wiring 41, and the output terminal 22 of the portable storage battery 2 is connected to the specific load 9 by the second main wiring 42. Therefore, the portable storage battery 2 and the specific load 9 are in series, with the portable storage battery 2 on the upstream side.

[0015] The portable storage battery 2 has an input terminal (hereinafter, AC input terminal) 21 for AC 100V and an output terminal (hereinafter, AC output terminal) 22 for AC 100V. An input side AC cable 24 is connected to the AC input terminal 21, and an output side AC cable 25 is connected to the AC output terminal 22. The portable storage battery 2 further has a DC input terminal 23 for connecting the solar power generation panel 3. The portable storage battery 2 has a power storage mode selection switch 20 for switching whether the power for storage is power from the AC input terminal 21 (AC mode), power from the DC input terminal 23 (DC mode), or a hybrid (HB) mode in which both powers are used for storage. In the hybrid mode in which both powers are used for storage, priority is given to storage from the DC input terminal 23 in order to achieve an energy saving effect. In the hybrid mode, when the power from the solar power generation panel 3 runs out at night, etc., AC power (grid power) is used for storage. As shown in FIG. 1, the switch box 1 is provided with an input side cable terminal 103 to which an input side AC cable 24 extending from the portable storage battery 2 is connected, and an output side cable terminal 104 to which an output side AC cable 25 extending from the portable storage battery 2 is connected.

[0016] A switch 10 is disposed in the switch box 1. The switch 10 is provided with two input terminals 11, 12 and one output terminal 13. One of the input terminals is a system-side switch terminal 11 connected to the target branch switch 81 via a main line terminal 100 and a first main wiring 41. The other is a power storage output-side switch terminal 12 connected to an output-side cable terminal 104. 1, the system-side switch terminal 11 is connected to a main line terminal 100 and is also connected to a storage battery input line 43 that is connected to an AC input terminal 21 of a portable storage battery 2. An output terminal (hereinafter, load-side switch terminal) 13 of the switch 10 is connected to a specific load 9 via a load terminal 101 and a second main wiring 42. The switch 10 is in the state shown in Fig. 1 unless the portable storage battery 2 is removed. Hereinafter, this state will be referred to as the normal state. In the normal state, the switch 10 shorts the storage output side terminal 12 and the load side switch terminal 13.

[0017] The portable storage battery 2 has a so-called pass-through function. That is, the internal circuit is configured so that the AC input terminal 21 and the AC output terminal 22 are always short-circuited regardless of the charging / discharging state and regardless of which input mode is selected. Therefore, when the switch 10 is in the normal state as shown in Fig. 1, the power from the target branch switch 81 passes through the first main wiring 41, the system side switch terminal 11, the AC input terminal 21, inside the portable storage battery 2, the AC output terminal 22, reaches the storage output side switch terminal 12, and is supplied to the specific load 9 through the load side switch terminal 13, the load terminal 101, and the second main wiring 42.

[0018] Although not shown, the portable storage battery 2 includes a power outage detection circuit and an automatic power supply circuit. The power outage detection circuit is a circuit that detects when the receiving voltage becomes zero (detects a power outage) while the input side AC cable 24 is connected to the AC input terminal 21, and detects when the receiving voltage is restored after a power outage is detected (detects the end of the power outage). The automatic power supply circuit is a circuit that automatically starts supplying power (outputs AC 100V to the AC output terminal 22) when the power outage detection circuit detects a power outage. These functions are similar to those of a so-called uninterruptible power supply (UPS).

[0019] Moreover, the portable storage battery 2 in the embodiment includes a reverse power flow prevention circuit and has a reverse power flow prevention function. Reverse power flow prevention is a function that prevents stored power from flowing in the reverse direction. In other words, it is a function that prevents power from flowing out from the AC input terminal 21. As an example of the portable storage battery 2 having such configuration, DELTA2 sold by EcoFlow Technology Japan Co., Ltd. can be used.

[0020] In the first embodiment, when the portable storage battery 2 is removed, the switch 10 is operated. This will be described with reference to Fig. 2. Fig. 2 is a schematic diagram showing the state of wiring when the portable storage battery is removed. When the portable storage battery 2 is to be removed, the switch 10 is operated in advance to be in the state shown in FIG. 2. That is, the system side switch terminal 11 is short-circuited to the load side switch terminal 13. Hereinafter, this state is referred to as the release state. By setting the portable storage battery 2 in the release state, the portable storage battery 2 is released from the specific load 9. Furthermore, the system power from the target branch switch 81 flows directly from the system side switch terminal 11 to the load side switch terminal 13 by the switch 10, and is supplied directly to the specific load 9. After setting the portable storage battery 2 in this state, the AC cables 24, 25 connected to the switch box 1 are pulled out, and the portable storage battery 2 is removed from the switch box 1. If the solar power generation panel 3 is connected to the DC input terminal 23, it may be left as it is, but if the portable storage battery 2 is to be taken outdoors, the DC cable 31 should be pulled out from the DC input terminal 23.

[0021] The operation of the retrofit set according to the first embodiment will be described below. The retrofit set is installed as described above in a facility such as a residence in which the user is currently living. That is, the power feeder to the specific load 9 is removed from the target branch switch 81, one end of the first main wiring 41 is connected to the branch switch 81, and the other end of the first main wiring 41 is connected to the main line terminal 100 on the switch box 1. One end of the second main wiring 42 is connected to the load terminal 101 on the switch box 1, and the other end is connected to the specific load 9. Then, the switch 10 is set to the normal state. Furthermore, the portable storage battery 2 is attached to the switch box 1 by connecting the AC cables 24 and 25. Furthermore, the photovoltaic power generation panel 3 is connected to the DC input terminal 23 of the portable storage battery 2 by the DC cable 31. The power storage mode selection switch 20 on the portable storage battery 2 is often set to the AC mode or the hybrid mode.

[0022] When the construction is completed as described above, the grid power from the target branch switch 81 flows through the portable storage battery 2 from the grid side switch terminal 11 of the switch 10, and is supplied to the specific load 9 via the storage output side terminal 12 of the switch 10. At this time, power is also stored in the portable storage battery 2. Furthermore, when the power storage mode selection switch 20 is set to the hybrid mode or DC mode, power is stored in the portable storage battery 2 by the solar power generation panel 3 during sunny daytime hours.

[0023] In this state, if a power outage occurs due to a large-scale disaster or the like, the power supply from the grid power to the distribution board 8 is cut off, and power supply from the target branch switch 81 is also cut off. The power outage detection circuit in the portable storage battery 2 detects this, and the automatic power supply circuit operates, and an output voltage is generated at the AC output terminal 22, and power supply is started. That is, power from the portable storage battery 2 is supplied to the specific load 9, and power supply to the specific load 9 (for example, the living room) is continued. When the power outage is resolved, the power outage detection circuit of the portable storage battery 2 detects the restoration of power, and the automatic power supply circuit stops the output of the stored power. Then, the pass-through function of the portable storage battery 2 resumes the supply of grid power to the specific load 9. Note that if it is sunny during the daytime when a power outage occurs, power is stored in the portable storage battery 2 in parallel. This postpones the time until the remaining charge of the portable storage battery 2 becomes zero.

[0024] When the portable storage battery 2 is removed for use outdoors, the switch 10 is switched from the normal state in Fig. 1 to the released state in Fig. 2. After that, the AC cables 24, 25 are pulled out, and the DC cable 31 connected to the solar power generation panel 3 is also pulled out. This removes the portable storage battery 2 from the switch box 1 and the solar power generation panel 3, making it possible to take it outdoors. In this embodiment, the solar power generation panel 3 is also portable, so it may be possible to take it out together with the portable storage battery 2 and store electricity outdoors using solar power.

[0025] According to the retrofit set of this embodiment, the portable storage battery 2 that has stored electricity during normal times (when there is no power outage) supplies power to the specific load 9 during a power outage, so electricity can be used by the specific load 9 until the amount of electricity stored in the portable storage battery 2 becomes zero. This makes it possible to use the minimum amount of electricity necessary during a disaster. And, since the construction can be completed by simply connecting the main wiring 41, 42 by interposing the switch box 1, to which the portable storage battery 2 and the solar power generation panel 3 are connected, between the target branch switch 81 and the specific load 9, the construction can be completed very cheaply and in a short time. And, since it is a set that combines the switch box 1 with a simple structure with the portable storage battery 2 and the solar power generation panel 3, which are inexpensively available, the cost of the hardware can be significantly reduced. Therefore, power outage countermeasures during disasters can be implemented at low cost.

[0026] In addition, the portable storage battery 2 can be removed and used for outdoor leisure activities, etc., so it kills two birds with one stone. There is another reason why the storage battery is portable; it has the advantage that it can be taken to another location indoors during a power outage and used as needed. For example, if the toilet can only be flushed electrically and the power cable is plugged into an outlet, the portable storage battery 2 can be taken to the toilet and the power cable can be connected to the AC output terminal 22 of the portable storage battery 2 to flush the toilet. In other words, it kills three birds with one stone.

[0027] Furthermore, since the retrofit set of the embodiment includes the solar power generation panel 3 and is capable of storing electricity in the portable storage battery 2, it is possible to extend the time until the remaining charge of the portable storage battery 2 becomes zero during a power outage, which is particularly suitable for long-term power outages. Furthermore, since the solar power generation panel 3 is also portable, it can be taken outdoors and used together with the portable storage battery 2, and the usage time of the portable storage battery 2 outdoors (the time until the remaining charge becomes zero) can be extended. If the solar power generation panel 3 is not portable, it can be attached to the roof or wall of a facility such as a house.

[0028] In addition, since the portable storage battery 2 has a reverse power flow prevention function, the stored power is prevented from flowing into the grid by mistake. In FIG. 1, when the stored power flows out from the AC input terminal 21 of the portable storage battery 2, it reaches the distribution board 8 via the grid-side switch terminal 11 of the switch 10, and flows back into the grid. In this case, if the owner who installed the retrofit set applies for power to the power company, the reverse power flow is permitted as the sale of surplus power, but if the owner has not applied for power, the reverse power flow needs to be prevented. In other words, the retrofit set of the embodiment is suitable for use as a photovoltaic power generation panel as a completely self-consumption type power generation facility while taking measures against emergency power during a power outage, and can be easily introduced because no power application is required.

[0029] In the configuration of the first embodiment described above, it is also possible to adopt an automatic switch configuration as the switch 10, which automatically goes into a released state when the portable storage battery 2 is removed. This point will be further explained with reference to Fig. 3. Fig. 3 is a schematic diagram showing an example of the configuration of the automatic switch.

[0030] In the example of Fig. 3, a socket 71 to which the input side AC cable 24 is attached is provided as the input side cable terminal 103, and a swing rod 72 is provided as a member interlocking with the socket 71. A spring member 73 is fixed to the rear of one end of the swing rod 72 (the side opposite to the socket 71), and a switch 1 is connected to the other end. The swing rod 72 can swing around a rotation axis located approximately in the center. The socket 71 can move in a direction toward the spring member 73 within a retainer (not shown). Furthermore, a stopper 74 is attached to the retainer to prevent the attached socket 71 from slipping out.

[0031] 3(1), when the input side AC cable 24 is attached, the socket 71 is pushed out and its position is held by a stopper 74. In this state, the spring member 73 is compressed via the swing rod 72, and the swing rod 72 acts as a lever to pull the short-circuit plate of the switch 1, so that the short-circuit plate shorts the system side switch terminal 11 and the load side switch terminal 13. When removing the input side AC cable 24, the stopper 74 is manually released and then the input side AC cable 24 is pulled out. This causes the swing rod 72 to swing in the opposite direction due to the action (restoring force) of the spring member 73, and the short-circuit plate of the switch 1 short-circuits the storage output side switch terminal 12 and the load side switch terminal 13.

[0032] In the above example, the socket 71 for the input AC cable 24 is an automatic switch, but the socket for the output AC cable 25 may be an automatic switch, or both may be movable switches. In the case of both, the input AC cable 24 and the output AC cable 25 may be integrated into one unit like a harness, and the above-mentioned structure may be adopted for the socket to which it is attached. There are various other possible configurations for the automatic switch, and it may be a switch that is not mechanical but is operated by electronic control using a sensor or the like. In any case, if the switch is not an automatic switch, if the operation of the switch 10 is forgotten and the portable storage battery 2 is removed, the power supply to the specific load 9 is cut off, and the state becomes as if the breaker was tripped. However, if the switch is configured as an automatic switch, there is no need to worry about forgetting to operate the switch 10, which is preferable.

[0033] Next, a retrofit power outage countermeasure set according to the second embodiment will be described with reference to Fig. 4, which is a schematic diagram of the retrofit power outage countermeasure set according to the second embodiment. As shown in Fig. 4, the power outage countermeasure set of the second embodiment differs from the first embodiment in that it includes a reverse power flow detection unit 5 and a cutoff unit 6. The rest is almost the same as the first embodiment. The reverse power flow detection unit 5 is a detection unit that detects the reverse flow of stored power output from the AC input terminal 21 of the portable storage battery 2. In this example, the reverse power flow detection unit 5 is provided on the first main wiring 41.

[0034] The interrupter 6 uses a switch 61 that mechanically opens (interrupts) a circuit by automatic external control, similar to a breaker. In this embodiment, the switch 61 is provided on the line between the system-side switch terminal 11 and the AC input terminal 21 of the portable storage battery 2. A control circuit 62 is provided to output an open signal to the switch 61. The control circuit 62 is a circuit that outputs an open signal to the switch 61 when a signal indicating that reverse power flow has been detected is sent from the reverse power flow detection unit 5. The switch 61 is automatically opened (interrupted) by the open signal, but is manually returned to a closed state. As a component of such a reverse current detection unit 5 and interrupter 6, for example, a reverse power relay with CT detection that detects reverse power can be used. The reverse power flow detection position may be on the line between the system-side switch terminal 11 and the AC input terminal 21, and a configuration in which a reverse power relay with CT detection is provided at this position may also be adopted.

[0035] Such an add-on set of the second embodiment is basically installed afterwards to a target branch switch 81 in the same manner as in the first embodiment. The switch box 1, portable battery 2, etc. are installed, and a reverse power flow detection unit 5 is provided on the first main wiring 41. The switch 61 in the breaker unit 6 in the switch box 1 is set to the closed state when use is started.

[0036] When a battery without a reverse power flow prevention function is used as the portable storage battery 2 and power flows backward from the AC input terminal 21, the reverse power flow detection unit 5 detects this and the cutoff unit 6 operates. That is, the control circuit 62 sends an open signal to the switch 61 and the line is cut off. This prevents the reverse power flow from flowing to the grid through the target branch switch 81. At this time, the power supply circuit via the portable storage battery 2 is cut off for the specific load 9, and power is no longer supplied. In this case, the user operates the switch 10 to release the circuit. Then, the grid-side switch terminal 11 is directly short-circuited to the load-side switch terminal 13 (without passing through the portable storage battery 2), and power supply to the specific load 9 is resumed. The switch box 1 may be provided with a lamp, a display, or the like that prompts the user to operate the switch 10.

[0037] In the second embodiment, since the reverse power flow detection unit 5 and the cutoff unit 6 are provided, even if the portable storage battery 2 does not have a reverse power flow prevention circuit, the reverse power flow does not flow to the grid side. Therefore, according to the retrofit set of the second embodiment, it is possible to take measures against emergency power during a power outage while using the solar power generation panel 3 as a completely self-consumption type power generation facility without having to worry about the type of the portable storage battery 2, and since no power application is required, it can be easily introduced. For example, even if the portable storage battery 2 was equipped with a reverse power flow prevention circuit when initially installed, but the user later replaced it and connected one that does not have a reverse power flow prevention circuit, it is possible to take measures against power outages without causing reverse power flow to flow to the grid.

[0038] Although the purpose of preventing reverse power flow can be achieved even if the circuit breaker 6 is configured to break on the first main wiring 41, the above configuration in which the circuit breaker breaks on the line between the system side switch terminal 11 and the AC input terminal 21 of the portable storage battery 2 is superior. Although reverse power flow to the system side is prevented even if the switch 61 is provided on the first main wiring 41, when the switch 61 is manually closed to restore power supply to the specific load 9, if the reverse power flow from the portable storage battery 2 has not been eliminated, the circuit breaker 6 immediately operates to open the switch 61. In this case, the portable storage battery 2 must be removed from the switch box 1 before the switch 61 is closed, which is cumbersome. In terms of not being such a complication, the configuration in which the circuit breaker breaks between the system side switch terminal 11 and the AC input terminal 21 of the portable storage battery 2 (on the storage battery input line 43) is superior.

[0039] Next, the retrofit set of the third embodiment will be described. Fig. 5 is a schematic diagram of the retrofit set of the third embodiment. The retrofit set of the third embodiment is also a set that is retrofitted and connected to a target branch switch 81 in a distribution board 8 of a house or the like, and includes a switch box 1, a portable storage battery 2, and a photovoltaic power generation panel 3. The retrofit set of the third embodiment differs from the first and second embodiments in that the portable storage battery 2 is in a parallel relationship with the specific load 9 during storage of electricity.

[0040] As shown in Fig. 5, in the third embodiment, a box internal main line 411 and a storage battery input line 43 are provided in a form in which a line connected to a first main wiring 41 branches off. The box internal main line 411 extends from the branch point and is connected to the load terminal 101 via a switch 14. The output side cable terminal 104 is also connected to the load terminal 101 via a switch 14. The switch 14 is normally (when there is no power outage) in a state in which the box internal main line 411 and the load terminal 101 are short-circuited (hereinafter, storage battery off state), and when a power outage occurs, the switch 14 opens the box internal main line 411 from the load terminal 101 and shorts the output side cable terminal 104 to the load terminal 101 (hereinafter, storage battery on state).

[0041] As can be seen from FIG. 5, when the switch 14 is in the battery-on state, the portable storage battery 2 and the specific load 9 are in series. That is, the portable storage battery 2 is in parallel with the specific load 9 when storing electricity, but is in series with the specific load 9 when discharging electricity. The portable storage battery 2 is connected to the target branch switch 81 on the input side, and in the event of a power outage, the power supply becomes zero, detecting the power outage, and outputs power from the AC output terminal 22 to supply it to the specific load 9. The switch 14 is a manual switch such as a rotary switch, but may be a switch that is provided with a sensor that detects a power outage and is automatically turned on and off by a signal from the sensor. The power outage detection sensor can be provided in the distribution board 8 or on the first main wiring 41.

[0042] As shown in FIG. 5, in the third embodiment, a reverse power flow detection unit 5 and a cutoff unit 6 are provided in consideration of the possibility that the portable storage battery 2 does not have a reverse power flow prevention function. In the example of FIG. 5, the reverse power flow detection unit 5 is on the first main wiring 41, but it may be on the storage battery input line 43. A switch 61 included in the cutoff unit 6 is provided on the storage battery input line 43. When a reverse power flow occurs in a case where the portable storage battery 2 does not have a reverse power flow prevention function, the cutoff unit 6 also opens the switch 61 in this embodiment to cut off the power. Therefore, the reverse power flow does not flow to the grid. When the portable storage battery 2 has a reverse power flow prevention function, the reverse power flow detection unit 5 and the cutoff unit 6 are not necessary, as in the first embodiment.

[0043] In each of the above embodiments, the portable storage battery 2 has the DC input terminal 23 and is directly connected to the solar power generation panel 3, but the present invention can also be implemented with a portable storage battery that does not have the DC input terminal 23. When using a portable storage battery that does not have the DC input terminal 23, an inverter that converts the DC voltage output from the solar power generation panel 2 to AC of 100V is provided midway and the inverter is connected to the switch box 1. A storage changeover switch is provided inside the switch box 1 to switch between storing electricity in the portable storage battery 2 or in the solar power generation panel 3 depending on the system power.

[0044] In the above case, when the portable storage battery 2 is provided in series with the specific load 9 as in the first and second embodiments, when the power storage changeover switch is operated to connect the portable storage battery 2 to the solar power generation panel 2, the power supply to the specific load 9 is cut off, so a bypass line connecting the first main wiring to the second main wiring is provided, and a switch provided on this bypass line is set to be turned on in conjunction with the power storage changeover switch. However, when the portable storage battery 2 is charged by AC using the system power and the solar power generation panel 3 simultaneously, no power storage changeover switch is provided, and the bypass line and the switch on the bypass line are not necessary.

[0045] The retrofit sets of the above-described embodiments can be suitably used not only in ordinary homes, but also in offices and public offices. For example, public offices that act as a command center for responding to disasters need to ensure the minimum necessary power supply (such as a power supply for contacting relevant parties) even in the event of a power outage. For this purpose, the retrofit sets of the above embodiments can be used. [Explanation of symbols]

[0046] 1 Switch box 101 Load terminal 102 Panel terminal 103 Input side AC cable terminal 104 Output side AC cable terminal 10 Switch 11 Grid side switch terminal 12 Storage output switch terminal 13 Load side switch terminal 14 Switch 2 Portable battery 3. Solar panels 41 First main wiring 411 Box Main Line 42 Second main wiring 43 Battery input line 44 Battery output line 8 Distribution Board 81 Target branch switch 9 Specific Load

Claims

1. A power outage countermeasure set that is retrofitted to an existing distribution board connected to a power transmission and distribution network, the power outage countermeasure set being installed between a target branch switch, which is one of the branch switches in the distribution board, and a specific load in a facility in which the distribution board is installed, in a state in which power is supplied from the target branch switch to the specific load when there is no power outage, a first main wiring connected to the target branch switch; a second main wiring connected to the specific load; a portable storage battery having an input terminal connected to a first main wiring, storing electricity via the first main wiring by power supplied from a target branch switch during a non-power outage, and being detachable from the first main wiring; Solar panels and Equipped with the portable storage battery has an output terminal connected to the second main wiring in a state in which the portable storage battery can supply power to a specific load via the second main wiring during a power outage; The solar power generation panel is connected in parallel with the target branch switch on the input side of the portable storage battery, The portable storage battery is capable of storing electricity using the power of both the target branch switch and the solar power generation panel connected in parallel, or is capable of storing electricity using the power from either the target branch switch or the solar power generation panel, A power outage countermeasure kit that ensures power supply from the target branch switch to a specific load when the portable storage battery is powered by power from a solar panel during non-power outages. The portable storage battery is an add-on power outage prevention set that features a reverse current prevention circuit to prevent stored power from being output from the input terminal.

2. The portable battery has a pass-through function, the portable storage battery is connected in series with the specific load to the first main wiring and is connected to an upstream side of the specific load; The retrofit power outage prevention set according to claim 1, characterized in that a switch is provided for connecting the target branch switch and the specific load when the portable storage battery is removed from the first main wiring.

3. the portable storage battery is connected in parallel with the specific load to the first main wiring, 2. The retrofit power outage prevention set according to claim 1, further comprising a switch that disconnects the specific load from the first main wiring during a power outage and connects the portable storage battery to the specific load via the second main wiring to supply power.

4. 4. The retrofit power outage countermeasure set according to claim 1, wherein the solar power generation panel is a portable type.

5. A power outage countermeasure set that is retrofitted to an existing distribution board connected to a power transmission and distribution network, the power outage countermeasure set being installed between a target branch switch, which is one of the branch switches in the distribution board, and a specific load in a facility in which the distribution board is installed, in a state in which power is supplied from the target branch switch to the specific load when there is no power outage, a first main wiring connected to the target branch switch; a second main wiring connected to the specific load; a portable storage battery having an input terminal connected to a first main wiring, storing electricity via the first main wiring by power supplied from a target branch switch during a power outage, and being removable from the first main wiring; Solar panels and Equipped with the portable storage battery has an output terminal connected to the second main wiring in a state in which the portable storage battery can supply power to a specific load via the second main wiring during a power outage; The solar power generation panel is connected in parallel with the target branch switch on the input side of the portable storage battery, The portable storage battery is capable of storing electricity using the power of both the target branch switch and the solar power generation panel connected in parallel, or is capable of storing electricity using the power from either the target branch switch or the solar power generation panel, A power outage countermeasure kit that ensures power supply from the target branch switch to a specific load when the portable storage battery is powered by power from a solar panel during non-power outages. a reverse current detection unit that detects reverse current of stored power output from an input terminal of the portable storage battery; a cutoff unit that cuts off the reverse flow power so that it does not flow into the power grid when the reverse flow detection unit detects a reverse flow; A retrofit power outage countermeasure kit characterized by being equipped with:

6. The portable battery has a pass-through function, the portable storage battery is connected in series with the specific load to the first main wiring and is connected to an upstream side of the specific load; The retrofit power outage prevention set according to claim 5, characterized in that a switch is provided for connecting the target branch switch and the specific load when the portable storage battery is removed from the first main wiring.

7. the portable storage battery is connected in parallel with the specific load to the first main wiring, The retrofit power outage prevention set according to claim 5, further comprising a switch that disconnects the specific load from the first main wiring during a power outage and connects the portable storage battery to the specific load via the second main wiring to supply power.

8. 8. The retrofit power outage countermeasure set according to claim 5, wherein the solar power generation panel is a portable type.

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