A PV-house experience in Japan

A PV-house with a 3 kW solar-cells panel roof was constructed and has been used for ordinary family life by one of the authors. The PV output is interconnected to the utility power network with a reverse current flow. Average power output of the solar panel exceeded 13 kWh per day for sunny days and 6 kWh for cloudy days in May. Time-sequential data of power consumption and supply have been recorded. The PV generation system is found to be capable of generating 300 kWh per month on average and supplying as large as 100-200 kWh per month to the utility power network. This system has been proved to be effective in reducing the peak power demand in the hot summer days in Japan.