Rooftop solar in Japan typically costs about JPY 371,000 per kW installed, and household electricity is around JPY 33 per kWh. The average sunshine is about 3.6 peak sun hours a day.
As a rough example, a 5 kW home system would cost about JPY 2,134,000, make around 4,928 kWh a year, and save about JPY 162,608 a year. That is a payback of roughly 13.1 years.
Rooftop solar
For homes and businesses. Size, cost, savings and payback.
Open rooftop calculatorSolar plant
For larger projects. Project returns and break-even price.
Open plant calculatorThese are typical estimates, not quotes. Replace them with real quotes before you decide anything.