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DO YOU KNOW? Inverter conversion formula?

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

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  1. Dave

    Dave Guest

    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. Soeren

    Soeren Guest

    Hi Dave,

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

    Input 12V_DC
    Output Load 50VA ("RMS")
    Inverter effiency 70%

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


    * If it puzzles you dear... Reverse engineer *
    New forum: <URL:>
  3. Bill Darden

    Bill Darden Guest

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

    Kindest regards,

  4. Soeren

    Soeren Guest

  5. Dave

    Dave Guest

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

    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?

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