The daily energy requirement is then multiplied by the number of days that the system needs to be self-sufficient. This will depend on the location and the weather conditions in the region. The total energy requirement is then divided by the battery voltage and the efficiency of the inverter to calculate the size of the solar panel needed.

Besides calculating the total energy load, it is also essential to consider the peak load. The peak load refers to the maximum energy requirement during a given period. For instance, an air conditioner that consumes 1200 watts may only be used for a few hours each day, but during that time, it will require the full 1200 watts. It is important to ensure that the inverter and battery capacity can handle such peak loads without failure.