Gualtier Malde wrote in message
news:frEbc.65804$w54.401828@attbi_s01...
Dick Locke wrote:
I am thinking about installing dual electric primary winches,
which
are 1500 watt 12 v motors (still waiting on the electric
specs to see
breaker size which will define wiring size. I believe that's
startup
wattage.)

1500 Watts? Are you sure? The formula P=IE, or I=P/E =
I=1500/12=125Amps.
Thats a whole lot of juice. Do you have water cooled jacketed
batteries?

My anchor winch takes 100a when it's working hard, so as soon as
the chain tension comes on and the winch slows down, we shove the
boat forward with a touch of engine.

Because it can take such high amps, I prefer to feed the winch
from the engine battery (good at high amp discharge) rather than
my domestic deep cycle batteries, which don't like such a
discharge. It's not as bad as it seems though, the engine's
always running when I'm lifting the anchor, so some 50a is being
supplied direct from the alternator.

JimB