6 hours of sun in south africa 2.
Formula for determining solar panel sizing.
Solar panels are rated in watts but we know how many amps we require.
For amps we will plug in the number we just found 29 4 a.
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.
Use a low wattage 150w and high wattage 370w example to establish a range ex.
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.
Then divide the kw output by your panel s efficiency to get the total number of solar panels for your system.
Then divide the kw output by your panel s efficiency to get the estimated number of solar panels you ll need for your system.
Calculate the size of your solar system.
17 42 panels to generate 11 000 kwh year.
Amps the solar panels must generate in full sun.
1302 wh to replace 6 hours sunlight 220 w panel rounde off.
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.