How to calculate the power of PV modules when you DIY your home solar system?

How to calculate the power of PV modules when you DIY your home solar system?

PV module power calculation method

Take 100W output power and use it for 6 hours a day as an example to introduce the calculation method:

1. First calculate the watt-hours consumed per day (including the loss of the inverter): if the conversion efficiency of the inverter is 90%, then when the output power is 100W, the actual required input power should be 100W/90% =111W; if it is used for 5 hours a day, the power consumption is 111W*5 hours = 555Wh.

2. Calculation of PV modules: Calculated according to the daily effective sunshine time of 6 hours, and then considering the charging efficiency and the loss during the charging process, the output power of the PV modules should be 555Wh/6h/80%=116W. 80% of which is the actual power used by the PV modules during the charging process.