# DO YOU KNOW? Inverter conversion formula?

Discussion in 'Electronic Basics' started by Dave, Jun 4, 2004.

1. ### DaveGuest

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?

2. ### SoerenGuest

Hi Dave,

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

--
Regards,
Soeren

* If it puzzles you dear... Reverse engineer *
New forum: <URL:http://www.ElektronikTeknolog.dk/cgi-bin/SPEED/>

3. ### Bill DardenGuest

Please see Section 7.9 in the Car and Deep Cycle Battery FAQ on
www.batterfaq.org for inverter, battery and charger sizing.

Kindest regards,

BiLL......

5. ### DaveGuest

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

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