The power generation is not only related to the number of photovoltaic panels installed, but also related to meteorological conditions and system efficiency, so I will list the capacity under one condition for your reference: when the equivalent peak sunshine is 5 hours a day and the system efficiency is 80%, it takes 3.75kW to generate 15 kWh of electricity, and if each panel is 260W, it needs 15 panels. According to the current construction cost of household photovoltaic projects, the whole system will cost about 30,000 ~ 50,000 yuan.