Join Date: Sep 2008
Location: Charlotte, NC
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Re: Trolling Motor Battery Charge
What size trolling motor? How much dinghy cruising are you doing that you are running down a battery so bad you need to switch it out? I assume a standard group 24/27 AGM for the trolling motor? So 105AH or so, so roughly a half hour full throttle to 50% on a 55lb thrust motor, or about an easy 1.5 mile range round trip. I suppose you are doing multiple trips a day?
The basic idea as you have said it is fine, I just dislike pulling the starter battery, seems to defeat the purpose.
Oh I think I see. You are saying your only way to charge it is to swap it out, than absolutely just add a pigtail and connect it to the house batteries to charge it (provided 12v bank of course). There are more complicated solutions (isolators, charge balancers, etc.) that might/would charge a bit faster, but that is totally workable.