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[Chance]

Originally Posted by quantum

Here ya go. My math....As I thought I had read. I had thought the 12v battery times the 100ah = 120 x 2 = 240. I am new at this thus the questions and I am sure you are correct... bad brain day..LOL


My reply was based on what I read below/?
This is the online version I used :The key is to use the watts you know to calculate the amps at the battery voltage . For example, say you want to run a 250 watt 110VAC light bulb from an inverter for 5 hours. Amp-hours (at 12 volts) = watt-hours / 12 volts = 1470 / 12 = 122.5 amp-hours.

Thanks for the info on the generator. Our use will be small other than some LED lights and possible, TV for a bit. My concern was the heater fan and the fridge till the generator kicks back on.

Be well

Your math is off.

100 Ah X 12 Volt = 1,200 Watt-hours (per battery)

2 batteries is therefore 2,400 Watt-hours

Useable capacity at 50% state of charge:

2,400 X 0.50 = 1,200 Watt hours

Large residential refrigerators use “about” 2,000 Watt-hours daily (in a house setting where it’s cool), so your two batteries will need charging multiple times per day. The more you use other electrical loads, the more often you’ll need to charge the two batteries.