The price of household solar panels is currently around 15 yuan per watt, and there are many types of panels, ranging from tens of watts to more than 300 watts. Install according to your home's electricity consumption. For example, a 30-square-meter battery board needs about 20 pieces for a 180W board or 15 pieces for a 240W board (total about 4000W), about 35 to 40 pieces for a battery (12V100A), an inverter, and the battery board accounts for 60% of the cost. %, the current market price is about 15RMB for 1W, the battery accounts for about 30% of the cost (about 600RM per piece), the inverter accounts for about 5% of the cost (about 3000-4000RMB), and the other accounts for about 5% of the cost. Total cost At about RMB 100,000, the light is 6H a day, and the power generation per day is about 20-30 degrees.

The solar energy conversion efficiency of a general solar panel is about 11%, and it is about 14W per square meter under the sunshine on a sunny day.