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#### Dave

- Jan 1, 1970

- 0

Just curious if there is a set formula for calculating how many amps a

12 volt car inverter draw from battery given the load of an AC device?

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Was my original question, had a few more...

Got this as an answer (thanks Soren):

Input current = output power / (input voltage * inverter efficiency)

Eg.

Input 12V_DC

Output Load 50VA ("RMS")

Inverter effiency 70%

Input current = 50VA / (12 * 0.7) = ~6A

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Does this equation apply for an 120VAC device plugged into the 12V_DC

inverter?

Is the equation different for resistive and inductive loads?

Being new to the terminology, is VA truly equal to Watts?

So lets say I have a TV plugged into my inverter: needs 120VAC of

course and draws who knows, 1.2 amps. Would the above equation apply?

Dave