Electricity calculator

Inverter Battery Backup Calculator

Estimate how long an inverter battery will run your load during a power cut.

How it is calculated

Usable battery energy (Wh) = Ah × volts × batteries × usable depth of discharge. Backup hours = usable energy × inverter efficiency ÷ load watts.

Results are indicative planning estimates, not official invoices. Actual bills depend on your DISCOM's current tariff order, subsidies, meter charges, time-of-day rules and taxes.

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