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2-6 volt batteries, wired in series produce 12 volts, and can produce 200 to 250 amp hours depending on the brand of battery. Think of amp hours as fuel, the more the better. If you wire 2 additional 6 volt batteries, in parallel, then you double your amp hours to 400 or 500 depending on the batteries.
A typical 12v deep cycle will give you 75-85 amp hours, so 2 in parallel yield 150 to 170 amp hours.
I have 4-6v batteries, run a residential refer, heated cpap machine and power my entertainment circuit. Typically, I'll still have enough power to make a pot of coffee before I need to fire up the generator.
Hope that helps,
Ken
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