... be converted into AC power 220V or 110V , the Inverter is necessary.)The function of every part:1.Solar Panel ... Ni-MH battery, Ni-Cd battery or Lithium battery.4.Inverter: The direct output solar power is 12VDC, 24VDC,48VDC.In ... 220VAC power for the electric appliances,so one DC-AC Inverter is necessary.it needs to convert the DC power ... nature?7. How many sets do you need ? solar home inverter off grid