Answer / mahavir jagdev

The battery is rated in ampere-hour. It means either "X" NOS OF AMPERE CURRENT WILL BE DELIVERED FOR "Y" NUMBER OF HOURS BEFORE IT GETS DISCHARGED , so the ampere-hours will be XxY.

The back up time will depend on the load applied to the battery in terms of watts/kws ....... amp-hrs divided by watts

Answer / shivaleela

Ampere Hour=(Watts/DC Voltage)*(1/Inv.Efficiency)*
(1/Batt.Efficiency)*No.of Hours

Ex:W=500W V=12V Inv eff.=0.9 Batt.eff=0.7 Time=1hour

Then Ah=(500/12)*(1/0.9)*(1/0.7)*1
=66.13
It means for 1 hour backup we can use 65Ah Battery for
500W/12V Inverter.
Similarly,for 2 hours Ah=65*2=130Ah

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