Formula For Determining Solar Panel Sizing

Calculate the size of your solar system.

Formula for determining solar panel sizing.

6 hours of sun in south africa 2. You can calculate how many solar panels you need by multiplying your household s hourly energy requirement by the peak sunlight hours for your area and dividing that by a panel s wattage. The number of solar panels of the size used in the calculation will theoretically meet that energy demand during a sunny day. So to determine the wattage of solar panels required we will use the formula watts volts x amps w v x a.

1302 wh to replace 6 hours sunlight 220 w panel rounde off. Amps the solar panels must generate in full sun. Solar panels are rated in watts but we know how many amps we require. Then divide the kw output by your panel s efficiency to get the estimated number of solar panels you ll need for your system.

Then divide the kw output by your panel s efficiency to get the total number of solar panels for your system. For amps we will plug in the number we just found 29 4 a. To figure out how to size your solar system take your daily kwh energy requirement and divide it by your peak sun hours to get the kw output. 120w panel x 80 96w actual panel size taking inefficiencies from the panel into account including charge controller inefficiency 1302 wh 96w 13 6 hours to fully charge.

13 6 hours 6 sun hours 2 26 days to fully charge. Total number of solar panels to calculate the size of your solar photovoltaic system take your daily kwh energy requirement and divide by your peak sun hours to get the kw output you need.