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Old 10-13-2015, 01:55 PM   #1
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Battery Size

Hello all,
I'm new to all this RV stuff but jumping in and learning a lot from this forum. I have a 2016 Freelander and it only came with one 24DC battery. I have just purchased roof solar panels awaiting installation and a suitcase style portable solar system. To compliment this setup I need to add a second battery. I put a GC2 battery into the battery compartment and it fit, with the exception that the screw post terminals and fill vent pressed lightly against the foam insulation of the battery box lid/step top. I assume its a no go with such a tight clearance., If I raise the step top, how much venting room is needed?
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Old 10-15-2015, 12:36 AM   #2
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If U R going to use solar,u will need a lot more battery than a single group24. Two group 31s would be more like it. What good is it to have solar if you have no place to store your elec? I have 600 watts of panels and a MPPT controller with 5 grp31 bats. We boondocks a lot and rely on solar.


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Old 10-15-2015, 12:59 AM   #3
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I would have a huge battery bank if there were room, but the battery box can only support 2, and not sure if they can even be 27's. It's just a bit larger than two 24 batteries
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Old 10-15-2015, 06:12 AM   #4
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Can you fit two 6v golf cart batteries? You need as much storage as you can get.
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Old 10-15-2015, 11:53 PM   #5
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Quote:
Originally Posted by Mark_Harrington View Post
Hello all,
I'm new to all this RV stuff but jumping in and learning a lot from this forum. I have a 2016 Freelander and it only came with one 24DC battery. I have just purchased roof solar panels awaiting installation and a suitcase style portable solar system. To compliment this setup I need to add a second battery. I put a GC2 battery into the battery compartment and it fit, with the exception that the screw post terminals and fill vent pressed lightly against the foam insulation of the battery box lid/step top. I assume its a no go with such a tight clearance., If I raise the step top, how much venting room is needed?
A GC2 is a 6 volt golf cart battery. you can't mix that with a 12 volt, You will need either 2 12v or 2 6 v. If you have the room or can make room get 2 6v golf cart batteries they will produce more amps.
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Old 10-17-2015, 06:33 PM   #6
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One more time. If you combine two 6 vdc batteries of 125 amp hr each in series, you have 12vdc @ 125 amp hrs, NOT 250. The 125 amp hrs is at 6vdc, not 12vdc.
If you combine two 12vdc batteries of 125 amp hrs each in parallel, you will have a total of 250 amp hrs @12vdc.
You will find this on several threads here on the forum. It's a common miscalculation.
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Old 10-17-2015, 07:45 PM   #7
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I think what wanderer69 is saying is you will have more amp hour capacity with two 6v batterys compared to two 12v of the equivalent physical size and weight.
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Old 10-17-2015, 08:15 PM   #8
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My sailboat has 8 x 6vdc batteries for the house and 2 x 12vdc batts for cranking [diesel] so this isn't my first rodeo. If I could trade out all the 6vdc units for 12vdc batteries, I would do it in a heart beat, but the battery compartment was designed for the 6vdc setup.
A 12vdc battery of the approximate size same size as a standard 6vdc, will not have very many amp hrs to play with and the 6vdc will out weigh it by far.
I have 5 x 12vdc batteries in my bank in the TT and can't imagine what the weight would be if I used 6vdc units. It's just what fits your personal needs and weight/size parameters. Just remember there is a core charge for each unit and if you lose a 6vdc battery in the system, you are shut down. Lose one 12vdc and you just lose amp hrs, but you are still online.
Different strokes for different folks. My golf cart has 12vdc bats.
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Old 10-18-2015, 01:26 AM   #9
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"I have 5 x 12vdc batteries in my bank in the TT and can't imagine what the weight would be if I used 6vdc units."

In discussing weight and amp hours. Your 12v Group31 weighs 69 lbs and is rated at 100 AH and a 6v that weighs 68 lbs is rated at 245 AH.

So if we do the math.

Your TT battery bank weighs 345 lbs with a capacity of 500 AH and a total of 5 batterys. The equivalent with 6v batterys would be 4 batterys weighing 272 lbs with a capacity of 490 AH.
That is 73 lbs more with a 12vdc bank and almost the same capacity (10 AH less).
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Old 10-18-2015, 09:08 PM   #10
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All of my 12vdc batteries are rated 125 amp hrs or above. The way I figure it, that's 625+ amp hrs.
The 6vdc batteries in my boat are 180 amp hrs weigh 71 lbs each. Where can you get a 6vdc battery that stores 245 amp hrs?? I've bought a lot of 6vdc batteries in my time but never seen one that big. Even then, connected two each in series then paralleled, that would total 490 amp hrs @ 12vdc.
That is 135 amp hrs difference or the equivalent of one large deep cycle 12vdc battery.
Sorry, just not a fan of all those 6vdc batteries taking up so much space and all the core charges when they need replacing. My boat cost me a fortune every time I have to replace batteries and they are charged by a wind gen.
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