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How long will a 12VDC fan (320mA) run on 2 6V batteries connected together? Answered



I think I've seen those batteries rated at anywhere from 18 to 25 Ah. Divide that (say 20) by .320 gives 62.5 hours. Double it for 2 batteries, 125 hours. Someone with a large electrical brain please correct this if I am wrong.

No, you double either the amps or the voltage, not both.

Using your figures, if the OP connects the batteries in a series, he will have 62.5 hours @ 12 volts.

Parallel would give you 125 hours @ 6 volts.

Yeah, 125 hours @ 6V, I just didn't read the Q properly. I drink a bit.....

If you connect batteries in series (which I'm assuming he is since it is a 12V fan) the capacities dont add up.

FYI, so far the fan ran 10.5 hours last night, and is running strong tonight after 2 hours.

Thanks again, and sorry, I realized what the 320 was after I shut down, and after going to bed.

Thanks so much to all. Where does the 320 (or .320) figure come from?

thanks, they are fully charged (new) 6v alkaline lantern-type batteries. They also say NEDA 908A 6 volts, if that helps. Thanks again.