Solar heating and photovoltaic heating Photovoltaic heating is profitable.
1. The efficiency of photovoltaics is around 16 to 20%. It is used to generate electricity and heat hot water. The only effective way is to use a heat pump. heating, it's around 2.6. It's really the yield is 42% to 52%.
2. If solar energy directly heats hot water, the efficiency can reach more than 80%. The initial investment in solar panels + heat pump is basically exorbitant.
3. In terms of energy conversion, solar water heaters are more efficient. Photovoltaic power generation and reheating first converts solar energy into electrical energy, and then the electrical energy is converted into thermal energy. With each conversion, energy is lost.