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CJT

wrote:

Hello, I use a 12 volt winch to pull my boat up on a marine railway at
my seasonal cottage in Canada. I do not have permanent AC power to the
location, but can get a big enough extension cord to it if need be. I
want to buy a more powerful winch which requires a battery rated at "12
VDC - 650 Cold Cranking Amps" which is not a problem. I would like to
buy a back-up 12 volt AC to DC converter to power the winch if the
battery fails. Please advise on how to rate the converter based on the
battery requirement. Much thanks! D. MacQueen.

If it really draws 650 amps, or a significant fraction thereof, you
might as well forget it. The power supply will cost much more than
the winch (and I seriously doubt your extension cord will be up to
the task). Buy a backup battery instead.

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