Alexander":3seoqgwf said:
Fortunately the installer of my present one used #8 ga wire from the batts to the 25 amp fuse and to the up/down switch instead of the #10ga as specified in instructions.That should be ok for the 700 series but with the upgraded fuse and switch that's included. This could have been a factory installation before the windlass model was chosen.
It might slightly depend on the run. On my 22 I just barely made it into the #6 category, and #8 would have been too small for sure. Reason I say that is that for the 700 horizontal their chart shows you can have up to a 50' round trip run for #6 cable (#8 only gives you a 23' round trip run). I think I figured it out (IIRC) that their max would be close to 10% voltage drop. Also IIRC, I'm at around 45' round trip on my 22, from the windlass to the contactor and then on to the the battery in the lazarette at starboard stern. But the 700 takes a 50 amp fuse to the 550's 25 amp fuse. Also, maybe your batteries are further forward on the 25. Otherwise you might want to double check. Although now that I say that, there is something odd in the chart....
They show the "Pro Sport" (is that the 550?) and as expected, it must draw slightly less as the breaker is smaller (25A to the 700's 50A and 1000's 70A), but yet they show the Pro Sport as needing larger cable than the 700...? Something looks wrong there to me. I'll post the chart here in a moment.
I do know that many folks with 22's who have the 700 horizontal have wired with #6 cable, and when I calculated it on my own with a voltage drop calculator, I also came up with #6 for the 700 on my 22 with the ~45' run.
But maybe the 25 is set up so you would have a shorter run, or maybe if the chart is wrong, #8 would work for the 550. It would make sense given the 25 amp breaker vs. the 50 amp one.
Okay, here is the chart from the manual for the 700/1000/Pro Sport (is that the 550? It does have the gipsy on port side). There seems to be something odd going on with the wire gauge sizing for the 550, unless I'm just reading it wrong. It doesn't seem to track with the apparent lower draw suggested by the much smaller fuse (?). Or am I just suffering heat stroke?
