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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That 1100 cooking watts, is going to draw about 1600 input watts, approx 140 amps draw on the batteries, could be more
And the amps draw will increase as the cooking minutes increase and the voltage of the batteries drop
And the "P" factor messes you up royally
15 minutes could end up being 60 amp hrs of use drain from the batteries
It's raining here, my generator is tucked away
And I just ran the diesel engine while using the inverter to power the MW to warm up coffee and lunch
That way the drain on the batteries wasn't as bad
Our MW is 1150cw. 1645 input watts
With alternator going voltage was holding at 13.6v
Adding 10% overhead for the inverter losses the 1645 input was 1809.5 watts into the inverter, which is 133 amps at 13.6v
1 2.6v from a near full battery will mean draw of at least 140 amps
This is use amps flow...NOT amp hrs capacity
Capacity used is amps*time*perkuet factor
And the amps draw will increase as the cooking minutes increase and the voltage of the batteries drop
And the "P" factor messes you up royally
15 minutes could end up being 60 amp hrs of use drain from the batteries
It's raining here, my generator is tucked away
And I just ran the diesel engine while using the inverter to power the MW to warm up coffee and lunch
That way the drain on the batteries wasn't as bad
Our MW is 1150cw. 1645 input watts
With alternator going voltage was holding at 13.6v
Adding 10% overhead for the inverter losses the 1645 input was 1809.5 watts into the inverter, which is 133 amps at 13.6v
1 2.6v from a near full battery will mean draw of at least 140 amps
This is use amps flow...NOT amp hrs capacity
Capacity used is amps*time*perkuet factor
