Formula For Determining Solar Panel Sizing

Solar panels are rated in watts but we know how many amps we require.

Formula for determining solar panel sizing. Use a low wattage 150w and high wattage 370w example to establish a range ex. 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. Then divide the kw output by your panel s efficiency to get the total number of solar panels 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.

For amps we will plug in the number we just found 29 4 a. Then divide the kw output by your panel s efficiency to get the estimated number of solar panels you ll need for your system. 6 hours of sun in south africa 2. 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. Calculate the size of your solar system. 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. 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.

So to determine the wattage of solar panels required we will use the formula watts volts x amps w v x a. 17 42 panels to generate 11 000 kwh year.