They're vastly undersizing the wiring. For an 85 amp load, at 12 VDC, with a 25' run (one direction) 4 AWG wire is going to result in a 9.04% voltage drop. This is really a bad idea.
1/0 wire over a run of 25' (50' total) with a load of 85 amps @ 12 VDC, will result in a 3.57% voltage drop... Ideally, you should be using 4/0 cable for this.
The voltage drop calculator I used is located HERE.
Originally Posted by SanDiegoChip
Finally found the cable size in the windlass manual It is 4 AWG up to 50’ run.
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