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Old 03-26-2015, 08:12 PM   #11
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I don't have a Costco anywhere near me. Also, if they're 6v, that won't work for me. The batteries will serve a dual purpose in which they'll be used separately, when not camping.

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Go for it Chris, use what you have and quit worrying. It's your money!
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Old 03-26-2015, 08:24 PM   #12
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Thanks, OC. I think I'll buy one for this trip, then replace the 24DP with a 27DC in the not distant future. That way the difference between the old 27 and the new 27, if any, will be minimal.

Now, if only I could sell somebody a slightly-used 24DP...

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Old 03-26-2015, 08:28 PM   #13
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Thanks, OC. I think I'll buy one for this trip, then replace the 24DP with a 27DC in the not distant future. That way the difference between the old 27 and the new 27, if any, will be minimal.

Now, if only I could sell somebody a slightly-used 24DP...
Keep it on a trickle charger and use it for whatever. You might need to jump start your DW's vehicle or your own this next winter.
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Old 03-26-2015, 08:40 PM   #14
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If you have the switch shown, you can use the both position when drawing power from the battery and then select only one to charge them separately.
The initial suggestion of the switch brought that to mind. If charging the batteries separately, does that double the time I have to run the generator? Or is the total amount of amperage and time the same, just split between the two, or perhaps a little longer than if a matched pair were charged together?




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Old 03-26-2015, 09:44 PM   #15
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If you parallel them temporarily for your trips and then separate and charge them independently between trips. You won't have a problem and they'll probably last a long time. The big thing to watch when parallel charging odd batteries is that one will undercharge and the other will overcharge. So, watch the battery fluid when you're charging them in parallel. Just carry a bottle of distilled water to top them off if needed. Otherwise save some cash and enjoy your trip.
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Old 03-26-2015, 09:57 PM   #16
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I'll use the switch and charge them separately. We'll have distilled water on hand.

Can I assume the smaller battery would be the one that's subject to overcharge? If correct, can I charge them together until the smaller one is topped off, then switch to continue charging only the larger? I would test their charge voltage independently.
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Old 03-26-2015, 10:33 PM   #17
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One way to know for sure which is overcharging is to charge them together and monitor which one starts to off-gas (bubbles a lot more than the other) that's the one overcharging.
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Old 03-26-2015, 10:39 PM   #18
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I'll use the switch and charge them separately. We'll have distilled water on hand.

Can I assume the smaller battery would be the one that's subject to overcharge? If correct, can I charge them together until the smaller one is topped off, then switch to continue charging only the larger? I would test their charge voltage independently.
If they're sealed batteries, have fun getting the tops off to add water!
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Old 03-27-2015, 12:17 AM   #19
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If they're sealed batteries, have fun getting the tops off to add water!
I'm too cheap for sealed batteries.
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Old 03-29-2015, 11:59 AM   #20
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Before I paralleled the 2 of them, I'd add a battery switch that lets you pick one and then the other and manage my power usage that way.
So this seems to be the direction I'm taking. Can you suggest how to mount/wire the switch? I know you attach the positive terminals to the switch and ground the batteries independently of the switch. But, wanting to operate the batteries separately when not on the trailer, and there not being space on either battery box for the switch, where do I mount the switch? I have to build my own battery rack so I can make it wide enough to house a 3rd small battery box to house wiring connections, if useful.

Also, since they're both 12v they should be wired in parallel. I understand that the parallel connection wires should be the same length, both negative and positive. What I think I'll need to do in terms of wiring is to have 2 positive cables and 2 negative cables. The positive cables should go from the switch to the respective batteries. The negative cables will be used to split the main negative cable into two, each going to the negative post on a battery.

I've seen wiring diagrams showing the trailer positive going to one battery and the trailer negative going to another battery, with equal length cables bridging between positives and negatives on the two batteries. What's the difference between that, and what I described?
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