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
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