Solar PV system design will depend on several variables. First, determine the power consumption demands of the building. In a home, the appliances and total time of use are the biggest factors. You can also check the monthly bill for the average consumption in kWh.

Figure out how many PV panels would be needed to generate this kind of energy based on unit capacity. Get the right size of the inverter and provide an allowance of about 30% to be on the safe side.

Next comes the battery sizing which should be enough to store the charge necessary for at least the entire day. Others might want to get a battery that can last up to 3 days just in case requirements go up or the battery begins to discharge faster.

Lastly, the designer should compute for the proper solar charge controller size.