But if not...
Join Date: Sep 2011
Location: Annapolis MD
Thanked 7 Times in 7 Posts
Rep Power: 4
Re: Bow thruster - dedicated battery bank cabe
as an option, I installed a dedicated deep cycle battery for the windlass. Then connected an echo charger to the house batteries to keep the windlass battery charged.
If you do the math, the actual amp-hour rqmts of the windlass battery aren't that huge. The amperage draw is, but not the time requirement. Our Maxwell 1500 can draw up to 125 amps. But it only takes about 10 mins max running (overly generous) to raise the anchor. So worst case, it's only consuming about 20 amp hours.
The echo charger pulls up to 15 amps off the house whenever it sees over 13 volts. So worst case, the windlass battery is topped off in just over an hour of engine run time.
With only a 15 amp load, the wiring can be much smaller (and easier to run, and cheaper). Yes it does add a battery to the PM list. And it adds some extra weight. But for us it was a reasonable trade-off.
It also gave me an easy spot to tap for power for the salt water wash down pump.
Don't have a bow-thruster so can't comment on those loads or how that might change the calcs