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BFL13's avatar
BFL13
Explorer II
Oct 28, 2015

Why 108 Volts for Watts Ratings?

The specs for various brand converters use 108 volts for their input ratings.

If a converter is rated as having a max input draw of 15 amps at 108v, for 1620w, what would be its draw using a Honda gen that is at 124 volts?

This is related to the business of matching generators to converter size. You also need the converter's PF and the generator's actual VA, but that is not the actual question here.

Nor is the fact that some gens have a short time they will run at overload and some can suck on their starting batteries for some extra juice.

Just trying to understand the math of VA going from 108v to 124v

Thanks
  • 2oldman wrote:
    JesLookin wrote:
    1620 watts / 124 volts = 13.06 amps
    That's the obvious answer, but OP must be getting at something else.

    Maybe, but I can't tell what it is???
  • JesLookin wrote:
    1620 watts / 124 volts = 13.06 amps
    That's the obvious answer, but OP must be getting at something else.
  • 120 volts - 10% = 108 volts.

    15 amps x 108 volts = 1620 watts

    Theoretically:
    1620 watts / 124 volts = 13.06 amps
  • I'm thinking NEC or like that, but what I really want is the answer for VA going to 124v instead of 108v. Maybe amps go down if volts go up? No idea.
  • Metinks they were anticipating their devices working in the trenches on the front lines (RV parks) ?

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