12v Inverter Battery Size Calculator

Do you have a 12v inverter and need to find the right size battery? At BatteryStuff.com, we are always trying to improve our Knowledge Base to help our customers solve problems.

This new calculator combines our AC-to-DC Amperage Conversion Calculator and 12V Battery Run Time Calculator into a single tool to simplify your calculations.

Simply enter your 12v Inverter’s AC voltage, the AC amperage or wattage you intend to run, and the time you intend to run it for. The calculator will determine the 12v battery needed based on the information given.

Battery Capacity Needed

Voltage Load

Inverter's AC Voltage

AC Load

Watts OR Amps

Time

Hours

Amount of time you want to run your load.

Factors

Battery temperature
below 0° or over 85° F Battery over 6 months old

Type

AGM Flooded Gel

Calculate

Result

With a safe 50% max discharge level.

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