switching to two 6 volt batteries??? - Page 2 - Fiberglass RV


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Old 11-26-2014, 12:17 PM   #15
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It is not going to be a major problem to connect the batteries in parallel, as long as they are the same condition. They may be at different charges at time of connection. This will result in current flow, Maybe quite high current. Also, they may charge and discharge at different rates depending on their condition. If one battery is not holding a charge, it will drain the other battery as well.

I guess I just feel it is a less elegant solution. Totally subjective. I should have said that first.
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Old 11-26-2014, 01:43 PM   #16
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6 V golf cart batteries have the same foot print as a group 24 battery. They are however taller. clip They both act like one big battery, and they fit where two group 24 batteries would go.

I just got some numbers off the Trojan battery website and it is interesting. Their 6V 225 AH T-105 battery (GC2, traditional golf cart battery) is 10.3 X 7.1 X 11.1 inches and 62 pounds. A 12V group 24 85 (measly) AH is 10.92 X 6.6 X 9.24 and 47 pounds. So, if you can stand a half inch more width (assuming end to end configuration), a couple of inches in height and 30 more pounds tongue weight you can gain over 30% more AH capacity going with two 6V.
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Old 11-26-2014, 02:07 PM   #17
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Golf cart 6 volt batteries are true deep cycle design, most commonly available 12 volt "deep cycle" batteries are not. The 12 volt batteries generally available in stores are designed more for dual use, start small marine engines with some deep cycle capabilities designed in.

That said I find multiple battery set ups a headache when I have had to deal with them. Seems like one or the other will develop some minor issue and then I dink around trying to figure out which of the two kids is being a problem child. Or which connection. Hmmm I sound sort of jaded by past experiences even to myself.

That said there are folks who really need the storage capacity, and have the means to fully charge it via solar or generator. For them I guess the additional weight and maintenance makes sense. Thinking of folks that use 12 volt compressor fridge or CPAP machine and want to boondock.

If there was an easy way to address charging a dual independent system that would be my preference. As long as one of these buggers is working right I have power. Avoid the dependency between both batteries of either parallel and series hookup.
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Old 11-26-2014, 03:11 PM   #18
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Originally Posted by David Tilston View Post
It is not going to be a major problem to connect the batteries in parallel, as long as they are the same condition. They may be at different charges at time of connection. This will result in current flow, Maybe quite high current. Also, they may charge and discharge at different rates depending on their condition. If one battery is not holding a charge, it will drain the other battery as well.

I guess I just feel it is a less elegant solution. Totally subjective. I should have said that first.
Actually batteries in parallel are just fine. There might one exception if one battery gets a shorted cell it can drag both down.
You can connect batteries of different sized together and the rate of discharge will be the same in percentage of charge. It's a lot more fuss and bother to put switches in than just connect them in parallel.

Sometimes a water comparison is used when talking about electricity. In this case imagine two containers of water one half the size of the other connected at the 50% point. It doesn't matter which container you draw the water from. When you draw water out of one container the other follows until you get to the 50% point. I used the 50% point because you should never draw a battery below that point.

When making the first connection it's a good idea for them to both be fully charged, however they don't have to, they'll equalize soon.
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Old 11-26-2014, 03:36 PM   #19
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6 volt batteries in Bigfoot

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What would the advantage of having two 6 volt batteries which I assume you would be hooking up in series to get 12 volts vs having two 12 volt batteries hooked up in parallel to get 12 volts with more capacity. Just curious.
Here is my 2001 Bigfoot 21RB with two six volt batteries. We had to make a new bracket for batteries. Unable to remove propane tanks for filling. No one has had trouble filling them.
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Old 03-30-2016, 01:43 PM   #20
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Scamp 16 with 2 golf cart batteries

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I am changing from two propane bottles and one (12V) battery to one propane and two (6V) batteries. There will some weight increase but not much, and I tow with a 1/2 ton pickup so it will not hurt. The batteries will sit behind the single propane and the new set up is actually cleaner looking as the old dual propane hung over each side of the tongue.
Hi Tim,
Wish I checked out your Scamp at Green Eggs and Ham. I'm looking at adding two GC2 6V batteries to replace my group 29 12V battery on our 16' Scamp, but the space seems tight to be able to get them both within the frame width of the current location. Did you finalize your installation, and if so, do you have any photos? Did you end up switching to the single tank?
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Old 03-30-2016, 04:32 PM   #21
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I too just got (2) Trojan 6 volt batteries rated at 225 AH each...that is substantially more than my 12 volt marine/rv deep cycle at under 100 AH by itself...They are tremendously heavy in comparison though and I am not sure I want to put that much weight on the tongue to stress the frame of my '71 Boler even though the frame is in good condition. I am considering a box on the rear bumper. One thing to consider though with a battery setup is the distance and size of cable from the battery bank to the charger/controller and/or inverter. To small a diameter/gauge or too long a cable and you can get voltage drop and/or generate heat if the cables are not sufficient to carry the load.
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Old 03-30-2016, 04:34 PM   #22
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I have the T-105 same as TimberWolf mentioned...
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Old 03-30-2016, 04:38 PM   #23
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Also, here is a link to a very good explanation of voltage drop and a calculator for it as well...Voltage Drop Calculator
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Old 03-30-2016, 06:35 PM   #24
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if it hasn't been posted before....

this is a good link......1/3 more available amp hours.....and 1/3 the cost...over time

Deep Cycle Golf Cart Batteries For Power Storage


I have the same Bigfoot propane locker.....if I put two GCs in there and couldn't remove the tanks...I don't think anybody would fill them around here .....you got to admit those optics don't look good....probably work just fine forever...but removing the fill nozzle always squirts a little LIQUID (quickly turning to vapor)....one spark right then would cause a very loud bang...if it was me I'd install a cover over the batts...a right sized upside down plastic tub would do the trick....(my batts are inside the coah now)
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Old 03-30-2016, 07:20 PM   #25
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Originally Posted by Radar1 View Post
Hi Tim,
Wish I checked out your Scamp at Green Eggs and Ham. I'm looking at adding two GC2 6V batteries to replace my group 29 12V battery on our 16' Scamp, but the space seems tight to be able to get them both within the frame width of the current location. Did you finalize your installation, and if so, do you have any photos? Did you end up switching to the single tank?
Here is a link to the thread showing pics of the conversion:Custom "nose cone" & storage for Scamp. It all fits but is snug. The bottle goes in and out fine but has to be out to get the batteries in/out. I think I have all of 3/4" to spare in length for the batteries. Height is not an issue since I sized the space for the taller propane bottle.
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Old 03-30-2016, 08:16 PM   #26
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Here is a link to the thread showing pics of the conversion:Custom "nose cone" & storage for Scamp. It all fits but is snug. The bottle goes in and out fine but has to be out to get the batteries in/out. I think I have all of 3/4" to spare in length for the batteries. Height is not an issue since I sized the space for the taller propane bottle.
Thanks Tim. I suspect the two batteries are right behind the propane tank? Did you fit them lengthwise front to back or widthwise side to side?
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Old 03-30-2016, 08:47 PM   #27
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Thanks Tim. I suspect the two batteries are right behind the propane tank? Did you fit them lengthwise front to back or widthwise side to side?
Widthwise end to end behind bottle. I would take a pic but have lost my camera.. I actually took some cardboard and made a mock-up* of the two batteries (from dimensions gleaned from the 'net) and made sure it all fit. I had everything built before I even bought the batteries.

*I come by this honestly. My Mother built a whole scale model (out of cut up manila folders) of the two-story custom home she had built 35 years ago. It even had little scale furniture in the rooms to make sure it all fit! The Contractor loved it, no change orders during construction because she had worked it all out ahead of time and knew what she wanted and what would work.
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