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The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.
There's nowhere on the system to pull 12 volts from because you've effectively just made a single 24 volt battery. Electrically there's no longer any distinction between the two 12 volt batteries, they just happen to be contained in two separate (but electrically connected) containers making the single 24 volt battery.
If you decide to go the stepdown route, make sure you size the transformer for your load. The one I listed above is only rated for 60 watts, but there are much larger one$ available.
<blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote">But you cannot connect both batteries in Series and parrallel at the same time.... Boooom! <hr height="1" noshade id="quote"></font id="quote"></blockquote id="quote">
I guess you could charge them with a 24v solar panel!
With any number of similar voltage batteries connected in series, you can connect to the + & - on any single battery and get that battery's voltage.
If you wanted to be clever, you could have a couple of switches with lockouts to switch between series and parallel, then you could switch to 24v for trolling and 12v for othertimes.
But then I have to ask.... a trolling motor on a 25' sailboat? Couldn't you just setup a 12v fan in the cockpit and point it in the right direction
<blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote"><i>Originally posted by britinusa</i> <br /><blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote">But you cannot connect both batteries in Series and parrallel at the same time.... Boooom! <hr height="1" noshade id="quote"></font id="quote"></blockquote id="quote"> But then I have to ask.... a trolling motor on a 25' sailboat? Couldn't you just setup a 12v fan in the cockpit and point it in the right direction
Paul <hr height="1" noshade id="quote"></font id="quote"></blockquote id="quote"> We've had some unfortunate luck with the Yamaha 9.9 4-stroke lately. Last fall mud wasps built a nest between the timing belt and cam pulley resulting in the timing belt jumping one tooth and bending the valves. A dock neighbor convinced us his mechanic could walk on water so we had him rebuild the top end (new valves, magna-flux and shave the head, seat the new valves, etc) for $840.00. Started the motor this spring and it sounds like a sewing machine - valves clicking. We dropped the motor off yesterday and have no idea when we'll see it again. So we are hooking up a 24v trolling motor just to get us from the dock to the wind and back. It will also be nice to have a fallback propulsion unit. . . at least that is the thinking.
Notice: The advice given on this site is based upon individual or quoted experience, yours may differ. The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.