12v inverter draw on batteries with microwave
If I get a 2000w inverter for my MH and use my 1100w microwave, what will be the draw off the house batteries? Using Ohm's Law I calculate about 9 amps draw at 120v. Then converting from 120v to 12...
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Your math is very close... I normally use 10 volts and forget the efficiency factor. (Easier that way) but your formula is more accurate and almost exactly what my display shows.
Remember this: With lead acid batteries (And all types in fact) the faster you draw power the faster still they run down.
That is for GC-2's drawing 11 amps they should take 20 hours to hit zero.
But if you draw 22 amps it is not 10 hours but perhaps 8 or less (i do not know the formula) before they hit zero. and if you draw say 5.5, they may last 50-60 hours to zero
Of course you do not want to go to zero,, just half full.
Remember this: With lead acid batteries (And all types in fact) the faster you draw power the faster still they run down.
That is for GC-2's drawing 11 amps they should take 20 hours to hit zero.
But if you draw 22 amps it is not 10 hours but perhaps 8 or less (i do not know the formula) before they hit zero. and if you draw say 5.5, they may last 50-60 hours to zero
Of course you do not want to go to zero,, just half full.
