I putting together a 24v battery bank of Golf Cart Batteries for a trolling motor. Any thoughts regarding the use in series of (3) 8volt batteries vs (2) 12 volt batteries. I have sufficient space for either option.
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Thread: 3 8v vs 2 12v batteries
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3 8v vs 2 12v batteries
Regards,
Vincent Castigliola
Lilly Marie - 43 DC 1983
Pascagoula, Mississippi
Rather than history as a peaceful continuum interrupted by war, “For the first time in the nation's history men in authority are talking about an "emergency" without a foreseeable end" _ C. Wright Mills 1956
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05-22-2023 02:45 PM #2
Re: 3 8v vs 2 12v batteries
The more individual batteries you use, the less susceptible to failure the bank will be as a whole. Obviously there's a cost/benefit curve here to consider. This is why Hatteras originally used a bunch of little batteries to make 32v banks, and why they last for a decade or more without much trouble vs. a year or two or three in most boats. Just depends on what you want.
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05-22-2023 08:33 PM #3
Re: 3 8v vs 2 12v batteries
Each wet lead acid cell is 2.2 volts. Lithium is different.
Having 2 or 3 cases is not the issue. If it were 6 volt batteries would be best. Its the quality of the cells. Not the number in a case that matters.i
I'd not use 8 volts for this at all as the 12 and 24 and 48 volt battery options are far better technology .
I do many 24 and 48 volt banks and never use 8 volt batteries.Scott
41C117 "Hattatude"
Port Canaveral Florida.
Marine Electronics and Electrical Products Distributor.
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Re: 3 8v vs 2 12v batteries
Thanks for the comments
This project involves trying electric power as kicker for my infrequently used 1975 25 foot sailboat kept on a mooring. I've grown tired of replacing gasoline outboards and want to try electric.
Rather than spend 3000+ for an electric outboard I'm going to see how a trolling motor with a solar charged battery bank will work.. Lithium batteries are probably the best technology, but for this use, I suspect lead acid provides the best cost/benefit.
After comparing 6, 8 and 12 volt batteries it looks like 6 volt is best based upon cost and weight compared to amp hour capacity.
Using Duracell golf cart batteries:
(4) 6v Cost $440 provide 215 Amp Hr. cost $2.04 / AH and weight 1.13# / AH
(3) 8v Cost $390 provide 165 Amp Hr. cost $2.36 / AH and weight 1.24# / AH
(2) 12v Cost $708 provide 228 Amp Hr. cost $3.11 / AH and weight 1.11# / AHRegards,
Vincent Castigliola
Lilly Marie - 43 DC 1983
Pascagoula, Mississippi
Rather than history as a peaceful continuum interrupted by war, “For the first time in the nation's history men in authority are talking about an "emergency" without a foreseeable end" _ C. Wright Mills 1956
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05-23-2023 01:56 PM #5
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Re: 3 8v vs 2 12v batteries
What am I missing?
It is my understanding that the Amp Hour rating remains the same for batteries connected in series, only the voltage increases.Regards,
Vincent Castigliola
Lilly Marie - 43 DC 1983
Pascagoula, Mississippi
Rather than history as a peaceful continuum interrupted by war, “For the first time in the nation's history men in authority are talking about an "emergency" without a foreseeable end" _ C. Wright Mills 1956