| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem in the post-fitting of a photovoltaic power generation system, that a connection with a commercial power supply conventionally required a new installation of wiring from a photovoltaic inverter to a distribution board via a photovoltaic breaker, but an increase in high-density dwelling houses and the consideration of a fine view in recent years resulted in an increase in installation as existing facility of an in-house distribution board in a shed where post-wiring is difficult, making exposed wiring which impairs a fine view and an opening in the wall which impairs airtightness unavoidable, in the worst case, leading to determination about the photovoltaic power generation system itself that it is impossible to install.SOLUTION: Instead of connecting a photovoltaic power generation system and a commercial power supply in an in-house distribution board, a service breaker (contract breaker) in the distribution board is relocated together with a photovoltaic breaker into a waterproof box installed outdoors near a watt-hour meter. Wiring from the primary side of the photovoltaic breaker is connected by pressure welding in the middle of wiring on the secondary side of the service breaker, and lead-in wiring from the existing watt-hour meter into the inside of the house is connected to the secondary side of the service breaker, and further wiring from the watt-hour meter to the primary side of the service breaker is newly installed. As a result, a new installation of wiring from the inverter to the distribution board becomes unnecessary, and an inverter of indoor use type can be installed in a place which is wire-connectable from the outside. For an inverter of outdoor use type, furthermore, wiring into the house becomes unnecessary, providing only that a monitor, etc. are nonexistent. |
