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OFF TOPIC / Battery (6v vs 12v)

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Rick (KS)

08-13-2000 18:07:40

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OFF TOPIC but I don't know where a group of folks knows more about 6 and 12 volt batteries than here.

On my travel trailer the on board batteries are two six volt batteries wired to produce 12 volt. The guy that installed them said that this will produce more amps that two 12 volt batteries. Somebody else said (at a later time) false, probably just bought two 6 volt batteries cheaper than 12's on that day.

The batteries on the trailer power the lights, vent fans, water pump, radio, heater fan, etc; everything but the A/C and the 110 plugins. When it's time to replace batteries, what will do the best job for me?

Thanks in advance for your thoughts, comments, and knowledge.

Rick

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Nolan

08-15-2000 05:10:37

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Re: OFF TOPIC / Battery (6v vs 12v) in reply to Rick (KS), 08-13-2000 18:07:40

Two large 6 volt batteries are going to produce more current then one small 12 volt battery. Visa versa with two small 6 volt batteries vs a large 12 volt battery. So, there is no simple answer.

MG's ran dual 6 volt batteries, so I get to listen to discussions about converting to a single 12 volt battery frequently. A significant factor for automobiles is that battery technology has changed greatly, with much higher efficiencies...in 12 volt batteries. The 6 volts haven't been upgraded at all, so they are just as inefficient as they ever were.

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Kevin(Ont)

08-14-2000 16:01:06

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Re: OFF TOPIC / Battery (6v vs 12v) in reply to Rick (KS), 08-13-2000 18:07:40

He is right by using two 6volt batteries. The 12volt battery has higher cranking speed but shorter power reserve. A 6volt battery has a larger power reserve but slower cranking speed. With it running your motorhome accesories a pair of deep cycle 6volts will suit you best.

Hope this helps
Kevin

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Claus

08-14-2000 04:41:58

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Re: OFF TOPIC / Battery (6v vs 12v) in reply to Rick (KS), 08-13-2000 18:07:40

Do not go by CCA. CCA is the cold cranking amps rating of a battery. The amount of amperes for 30 seconds a battery will provide at zero degrees farenheit. Battery capacity in ampere hours is more important for your purposes. You also want deep discharge batteries if you intent is to run converters and lights etc for long periods of time. Now for the 6 volt vs. 12 volt question. If you use 6 volt batteries, you would have to place them in series to provide for 12 volt appliances. Theorectiacally, there would be no advantage to this scheme. We are talking about watthours here and. If you had batteries of the same size case, one would have 3 cells and the other 6. One could double the number of plates in the 6 volt cell and you would wind up with the same watts. A six volt battery has 3 cells in series (2.1 volts each) and a 12 volt battery has 6 cells in series so if you series 2 6 volt batteries you have the same thing as a 12 volt battery with more ampere hours. I hope this helps your confusion.\
Happy Motoring
Claus

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Claus

08-14-2000 05:06:47

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Re: Re: OFF TOPIC / Battery (6v vs 12v) in reply to Claus, 08-14-2000 04:41:58

Footnote:
This assumes that the batteries are of equal design. Obviously, if you buy a two cheap 6 volt batteries you will not get the same watthours than two good 12 volt batteries in paralell. You can usually go by the years one gives for a warranty. Also some battery manufacturers like to rate their batteries by "CA" cranking amps, the amount of cranking amps at room temperature for 30 seconds. This is just a suterfuge since batteries will loose up to 50% of their capacity at zero deg. In this way their CA numbers can be higher than CCA. This is a ploy to fool the public.
Happy Motoring
Claus

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John (AZ)

08-13-2000 20:26:21

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Re: OFF TOPIC / Battery (6v vs 12v) in reply to Rick (KS), 08-13-2000 18:07:40

My new used moterhome has two 6 volt golf cart batterys to make 12 volts. My last moterhome had a large 12 volt battery. The to 6 volt batterys work a lot better. If you have the room for the specal golf cart batterys I think it will work better.

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8n64something

08-13-2000 18:58:17

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Re: OFF TOPIC / Battery (6v vs 12v) in reply to Rick (KS), 08-13-2000 18:07:40

for the same wattage, cutting the voltage in half will double the amps...but if they're wired in series for 12v., thats not happening...IMHO

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DIESELDALE

08-13-2000 18:41:05

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Re: OFF TOPIC / Battery (6v vs 12v) in reply to Rick (KS), 08-13-2000 18:07:40

FOOD FOR THOUGHT.IF YOU HAVE TWO 6-VOLTS WIRED PARALLEL @ 250 CCA EACH YOU HAVE 500 CCA.IF YOU HAVE TWO 12-VOLTS WIRED IN SERIES @ 500 CCA EACH YOU HAVE AN AVAILABLE 1000 AMPS.THAT GUY WAS NUTS! IT IS VERTUALLY IMPOSSIBLE TO FIND 6-VOLT BATTERIES WITH OVER 300 CCA BUT IT IS COMMON TO FIND 12-VOLT BATTERIES 850-1000 CCA SO WIRE YOURSELF UP TWO 850CCA BATTERIES IN SERIES AND LET THE LIGHTS BURN ALL NIGHT.

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Jim WI

08-14-2000 10:54:53

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Re: Re: OFF TOPIC / Battery (6v vs 12v) in reply to DIESELDALE, 08-13-2000 18:41:05

Not quite right.

If you have two 6v@250CCA wired in series you have 12v@250CCA. If you have two 12v@500CCA wired in parallel you have 12v@1000CCA.

The CCA rating doesn't tell all though -- look at the amp-hour rating to give you an indication of how long the batteries will last. The amp-hour ratings will behave just like the CCA ratings when wired in series or parallel.

All things considered, the parallel connected 12v batteries is going to be best.

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