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Old 07-18-2018, 04:52 PM   #1
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Why 6 volt vs 2 12 volt

I have read numerous threads about 2 x6 vdc batteries being "better" the same in 12 vdc. I believe. I've done it. But what is the advantage? Why?

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Old 07-18-2018, 05:18 PM   #2
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Old 07-18-2018, 05:22 PM   #3
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6v golf cart batteries have thicker and longer-lasting plates. They also have higher ratings.
And a true 12v deep cycle battery is not common. Most are dual purpose marine batteries, which are less capable. They have CCA ratings which is for starting engines.
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Old 07-18-2018, 06:03 PM   #4
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Quote:
Originally Posted by bikendan View Post
6v golf cart batteries have thicker and longer-lasting plates. They also have higher ratings.
And a true 12v deep cycle battery is not common. Most are dual purpose marine batteries, which are less capable. They have CCA ratings which is for starting engines.
Thank you. What I think you are saying is that size for size, 6 volt batts will put out more amp-hours for longer?
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Old 07-18-2018, 06:14 PM   #5
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Exactly the gist of it. However amp/hr ratings can be a bit of a shell game.
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Old 07-18-2018, 06:18 PM   #6
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But there are company's that make great 12v deep cycle batterys
https://www.trojanbattery.com/product/t-1275/
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Old 07-18-2018, 06:25 PM   #7
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Something no one ever talks about is with the 2 6V batteries if a cell goes bad you loose 12V power, where as with 2 12V batteries if you have a cell go bad in one battery you can remove the battery and still have 12V to operate.
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Old 07-18-2018, 06:38 PM   #8
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Just remember, 2 batteries in series doubles the potential and not the capacity. 2 batteries in parallel doubles the capacity and not the potential.

So, grab two 6 VDC, 220 A-Hr batteries, put them in series, and you have a 12 VDC power supply with 220 A-Hr of capacity.

Grab two 12 VDC 120 A-Hr batteries, put them in parallel, and you have a 12 VDC power supply with 240 A-Hr of capacity.

The 6 VDC batteries independently have more capacity than a 12 VDC battery. However, in a 2x battery pack, the capacity will be pretty similar when using group 29 and larger 12 VDC. 6 VDC batteries are also more durable and reliable ... will withstand more discharge/charge cycles than their weaker 12 VDC counterparts.

A Trojan T-105 will give about 225 Amp-Hours. A group 29 battery from Advanced Auto Parts will give me about 115 Amp-Hours (both using a 20 hour discharge rate). So, the 2-battery systems will have similar capacities. Trojan will be much more durable ... and about twice as expensive.

Good luck.
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Old 07-18-2018, 06:48 PM   #9
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More or less, buy wet batteries by the pound. The heavier, the more amps.
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Old 07-18-2018, 07:45 PM   #10
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Quote:
Originally Posted by SeaDog View Post
Something no one ever talks about is with the 2 6V batteries if a cell goes bad you loose 12V power, where as with 2 12V batteries if you have a cell go bad in one battery you can remove the battery and still have 12V to operate.
Thats a good point. So itís 4 each 6V Batteries, A Ford, Goodyear Tires all torqued down to 1500 ft/lb with more memory than the Pentagon. So lets go RVíing.

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