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post #9 of Old 03-13-2010
sailingdog
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For a windlass, you really don't want a 10% voltage drop. It would probably make far more sense to install a battery forward and use a duocharge unit to keep it charged or to go with much heavier wire to provide a 3% voltage drop at a maximum. Providing low voltage to a windlass motor will shorten its lifespan.

BTW, from the lewmar windlass instructions:

Quote:
Check the voltage across the motor leads with the windlass on. (Proper voltage is 13.5 V. Constant low voltage will destroy the motor)

Quote:
Originally Posted by prior View Post
I am planning to go with AWG 2 for the windlass based on a reportedly fine (by some)10% voltage drop. I may install a battery in the bow as well but am undecided. I am thinking the windlass will run at about 85 amps under normal load?

130 amp, 50’. @ 10%
10.75x130x50/1.2=58229 AWG2
CM=K x l x L / E

CM = Circular Mil area of Conductors
K = 10.75 (Constant representing the mil-foot resistance of copper)
I = Current - amps
L = Length - feet
E = Voltage drop at load (in volts)



Sailingdog

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Telstar 28
New England

You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
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Last edited by sailingdog; 03-13-2010 at 02:50 PM.
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