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tubman · 10-02-2023, 09:27 AM

Here's a little calculation for you about a 6 volt fan. Conventional wisdom says that it takes from 2 to 5 HP to turn an engine driven fan. 1 HP equals 745 watts, so the best case, you need 1490 watts to turn an electric fan for the same effect. 1490 watts/6 volts=248.3 amps. I know these are theoretical figures, but in the real world Flex-A-Lite (who claim to make the most efficient automotive fans) state their fans require between 17.5 and 29 amps to function on 12 volts. That translates to 35 to 58 amps for a 6 volt version. Good luck getting that out of your generator (or even your alternator).

No wonder Brassworks doesn't list a 6 volt fan.

10-02-2023, 09:27 AM	#5
tubman Senior Member Join Date: Dec 2013 Location: Minnesota, Florida Keys Posts: 10,436	Re: 6 volt radiator fan recommendation Here's a little calculation for you about a 6 volt fan. Conventional wisdom says that it takes from 2 to 5 HP to turn an engine driven fan. 1 HP equals 745 watts, so the best case, you need 1490 watts to turn an electric fan for the same effect. 1490 watts/6 volts=248.3 amps. I know these are theoretical figures, but in the real world Flex-A-Lite (who claim to make the most efficient automotive fans) state their fans require between 17.5 and 29 amps to function on 12 volts. That translates to 35 to 58 amps for a 6 volt version. Good luck getting that out of your generator (or even your alternator). No wonder Brassworks doesn't list a 6 volt fan.