• Assume daily average household electricity consumption: 15kwh,

• Assume inverter efficiency 90%,

• Solar panel: assume average equivalent sunshine hour 6 hours, charging efficiency of 80%.

• Assume solar panel has 150 w/m2 energy area density.

• Maximum output power: 5kw

• So, battery pack size: 15kwh/0.9=16.7 kwh. Take as 17 kwh.

• Inverter, take as continuous rated output 5kw.

• Solar panel power: 17kwh/0.8/6hour=3.5kw.

• Solar panel size: 3.5kw/150w/m2=23 m2

• All parameters in the above calculation are taken as common values, and the calculation results can be used for reference at present. Depending on the location of the environment and the type of solar panels, the results may vary considerably.

• Optional function: to sell electricity back to grid.