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• ##### Good post!(4+ / 0-)
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Things get even more confusing when your trying to figure out how many amps you will draw out of your 12 volt battery system when running an 120 volt AC device through your invertor.

For some reason, that I've yet to understand, AC devices are rated in watts and DC devices are by how many amps(amp hours) will be consumed by the device in one hour.

For example, I want to run a 1000 watt microwave on my inverter and my 12 volt battery supply. How many amp hours will be used from my battery bank while it is running.

Using the equation Amps x Volts = Watts, we can determine how many amps of 110 volts will be consumed by the device.

Amps(?) x Volts(110) = Watts(1000) At 110 volts the microwave draws about 9 amps (1000 / 110)

At 12 volts we have
Amps(?) x Volts(12) = Watts(1000) From a 12 volt battery bank we would be using about 83 amps (1000 / 12)

It would take one big battery bank if you wanted to run a device like that for more than a short period of time, but since it only typically runs for a few minutes at a time, it's not that big a problem for a 400 amp battery bank.

Never attribute to malice that which can be adequately explained by stupidity.

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• ##### check it out, found by my seekrit little fren'(4+ / 0-)
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hyar

or worser, how much solar panel and time to charge and discharge to 50% a 12 volt battery and run a 110 v microwave with it..with the conversion efficiencies and all...people do those calculations, but geez..

that link can run at either 110vac or 12vdc...they say, and double as a cooler.

This machine kills Fascists.

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• ##### Once you throw in the time required...(4+ / 0-)
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to recharge the battery with solar power, it becomes almost a wild ass guess unless you live in some place like the Sahara Desert where you never see a cloud. I use my simple method and it seems to work fairly well...

If your battery is still not charged at the end of a sunny day, you need more solar panels!!! I'm not sure you can ever go wrong having more panels than you need!

Never attribute to malice that which can be adequately explained by stupidity.

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