Quote:
Originally Posted by Laird Scooby
6V x 85A = 510W
510W / 12V = 42.5A
I'd suggest a 45A/h battery or slightly above, anything up to 60A/h would be fine but make sure your dynamo/alternator has a decent output in A to cope with a bigger battery.
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+1.
Except, if you want to be really pedantic, the unit you should use for expressing battery capacity is Amp-hr, Ah, or the like (amps
times hour, not amps per hour).
A 12v battery having the same capacity (i.e. work-performing storage) as a 6v battery need have only half the Amp-hr rating. My 12v Amazon runs on a 53 Amp-hr battery without any problems (although the handbook - for the B20 - specifies 60 Amp-hr).