I love the title of this thread: "Feasible to change to 6v golf cart batteries?"
Simple answer: Yes.
Basis? Many of us simply configure our drives as with golf carts and even use the same components. Perhaps billions of hours of successful golf cart use and thousands of successful hours on boats.
Going with golf cart batteries is one of your best "bang for buck" options and about 3-4x cheaper per KWH than using the GPL-31T-2V Lifeline 2v batteries that have been suggested earlier.
And don't be afraid of parallel solutions despite the warnings…I ran with 2 permanently-linked parallel 36v golf cart battery strings for at least 10 years before switching to 10x paralleled 48v lithium permanently-connected (though fused w/10amp fuses each half-module) lithium modules.
There is a lot of misinformation out there. One I read here suggested that a shorted lead in paralleled strings of lead acid are somehow more dangerous than a shorted cell with paralleled batteries----As if that single shorted cell causes more current to flow from one string to the other because they are 48v nominal strings in parallel vs 6v batteries in parallel. In fact, with more series connections in a string, less current would flow into a shorted cell in a paralleled string than if batteries were "buddy paired" and one had a short. Also, a 2v cell short seriously stresses buddy pairs but doesn't stress series strings in parallel---e.g. a 2v cell short would only be 1/4volt stress on each of 8 golf cart batteries in a paralleled series string. Things would settle quickly, without danger.
Again, I ran my boat for several years with 6 series T-105 batteries in parallel with another series string. Another friend ran his boat with 3 parallel 36v strings and did hundreds of miles of cruising and charge cycles over 8-10 years before recently changing to a 6x parallel lithium configuration like mine---actually it's technically 12x parallel: 12P(12S2P) of Enerdel lithium cells.
YMMV-
-MT, Portland, Or.
Posted by: "Myles Twete" <matwete@comcast.net>
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