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Old 03-05-2009, 08:46 AM   #11
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Re: Dual Batteries

Good info to know, thanks
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Old 04-27-2009, 10:56 AM   #12
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Re: Dual Batteries

Hi all

Can any one tell me if 2 12 volt deep cycle batteries in parallel wouldnt provide more amp hours than two 6 volt in series thanks walt.

Walt
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Old 04-29-2009, 07:46 PM   #13
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Re: Dual Batteries

Walt,

At a first approximation, each kilogram of battery will have a fixed amount of stored energy. Energy (in joules) is amps times volts times number of seconds. (The voltage varies as the battery discharges, but we will ignore that.) Say you have a twelve-volt battery with 112 A*hr. Since there are 3600 seconds in an hour, the battery stores 4.8 megajoules. A six-volt battery storing the same amount of energy (because it has the same mass) will deliver 224 A*hr at 6 V.

Note, though, that when you put batteries in series, the number of amp-hours for the two batteries cannot be added together, because each amp that passes through the first battery also passes through the second. If you put them in parallel, you can add the amp-hours. So putting two 6-V in series gives you 224 amp-hours at 12 V, and so does putting two 12-V in parallel.

Now, all of this depends on the statement that the mass/energy ratio is constant for a particular type of battery. I checked Crown Battery's web site and found three representative batteries:


Part number
Voltage
Amp-hours[br](20-hour discharge)
Mass
Energy stored
Energy per kilogram
CR-235
6 V
235 A*hr
29.9 kg
5.1 MJ
170 kJ/kg
27DC36
12 V
115 A*hr
26.7 kg
5.0 MJ
190 kJ/kg
31DC36
12 V
140 A*hr
30.3 kg
6.0 MJ
200 kJ/kg

So, in this case, two 30-kg 12-V batteries in parallel should will give you a bit more energy than two 6-V batteries in series. You might want to look at the prices of the particular batteries.

But, as we discussed in a different thread, if your 12-V batteries are not perfectly matched, you will wear them out faster. They are not designed to be wired in parallel.
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Old 12-16-2009, 12:24 PM   #14
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Re: Dual Batteries

Ron,

This is really good information - thanks for sharing that.

Eric
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Old 12-17-2009, 10:16 AM   #15
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Re: Dual Batteries

Does anyone know if it is ok to use a 12v smart charger across both 6v batteries? I have one of these: http://www.amazon.com/gp/product/B00...ss_T15_product
and am hoping that it will work ok across the dual 6v.

Eric
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Old 12-17-2009, 09:04 PM   #16
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Re: Dual Batteries

Hi Eric

It will work fine, mine are on my work bench right now
and I put the charger on them once every month or two.
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