Formula For Determining Solar Panel Sizing

Calculate the size of your solar system.

Formula for determining solar panel sizing.

So to determine the wattage of solar panels required we will use the formula watts volts x amps w v x a. Then divide the kw output by your panel s efficiency to get the total number of solar panels for your system. 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. Use a low wattage 150w and high wattage 370w example to establish a range ex.

You calculate how many solar panels you may need by dividing the maximum hourly solar energy system output by the wattage output of one single panel. The number of solar panels of the size used in the calculation will theoretically meet that energy demand during a sunny day. 13 6 hours 6 sun hours 2 26 days to fully charge. For amps we will plug in the number we just found 29 4 a.

Solar panels are rated in watts but we know how many amps we require. 1302 wh to replace 6 hours sunlight 220 w panel rounde off. Amps the solar panels must generate in full sun. 6 hours of sun in south africa 2.

Then divide the kw output by your panel s efficiency to get the estimated number of solar panels you ll need for your system. 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.