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Old 03-15-2015, 11:03 PM   #21
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Is there such a thing as a 12V pure deep-cycle battery? If so, I need two to serve as backup power for my CPAP at home. My wife and I both use it. 2 x 6v is not practical for that purpose. I'd like to use the same batteries for occasional dry camping. As I usually have shore power I don't want to lug the extra weight of 2 batteries unless I expect to use them. For those reasons I hope to use 2 x 12v in parallel for dry camping, rather than 2 x 6v in series.
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Old 03-16-2015, 09:17 AM   #22
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Deka makes true deep cycle batteries, just make sure it is a DC battery (e.g., DC24) and i believe Trojan makes true deep cycle batteries too.
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Old 03-16-2015, 11:47 AM   #23
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Recently went to dual batteries on my Lacrosse 327 and just matched what had come on the trailer when we bought it late last year. It happened to be a 27 series NAPA so I took a picture of the top of it and walked in to the store and said do you have one of these?

Had to build a bracket to run the 2 n/s because Lacrosse put the bracket to far forward to run 2 e/w.
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Old 03-16-2015, 12:10 PM   #24
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If I can reliably get a day's use out of 2 group 24s without risk of during in the middle of the night, that (and a small generator) may be my first step. I'll accumulate what I need to charge/maintain a pair of 12v DC batteries and but those when my pair of 24s no longer serves the purpose.

As I need 12v for emergency brakes but don't want to schlep the bigger batteries back and forth to the storage site when retrieving the trailer, I'm thinking of a much smaller 12v to keep on the trailer for brakes. What size do I need for that? Is that a good/bad idea?
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Old 03-16-2015, 12:22 PM   #25
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Quote:
Originally Posted by f5moab View Post
Deka makes true deep cycle batteries, just make sure it is a DC battery (e.g., DC24) and i believe Trojan makes true deep cycle batteries too.
I use Deka as well (DC 31) and have had good luck. As others have mentioned, it should be a true deep cycle and not dual purpose.
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Old 03-16-2015, 02:12 PM   #26
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The NAPA deep cycles are also Deka/EastPenns and will have a DC in their model number if they are true deep cycle.
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Old 03-16-2015, 02:19 PM   #27
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My local battery wholesaler (The Best Battery Company, Inc. | Baltimore, MD) had a Trojan 27TMH for something like $80-100 cheaper than anywhere I could find. I asked them easily 3 times if they were sure of the price and still feel like I won something over on them.
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Old 03-16-2015, 02:36 PM   #28
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I swear by Interstate. Got in a jam and had to buy a NAPA battery once. Won't make that mistake again. Interstate all the way.
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Old 03-16-2015, 11:06 PM   #29
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I just looked at the battery supplied with the trailer. It's a Deka DP24. So, while it's undersized and not the ideal type, at least it's decent quality.

Considering that I rarely dry camp, that I need to assure that the batteries won't die overnight when using 2 CPAPs without humidifiers, and that I'm willing to recharge daily, is it reasonable to buy a single DP24 so I have a matched pair? My CPAP draws 3.0A max without humidifier, according to the user manual; my wife's draws 5.0A. We use low pressures so they probably draw less than that.

In addition to LED lights we may have a fantastic fan running, if warm. Also, the usual parasitic loads like gas monitors and the 12v controller for the refrigerator when operating on propane. Considering that, am I correct in believing a pair of DP24s would suffice until I choose to replace them with a pair of true deep cycle batteries?

Is it important that the batteries match? If I found a DC27 or DC31 at a price I was willing to pay, is it bad news to combine it in parallel with a DP24?

Thanks
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Old 03-16-2015, 11:44 PM   #30
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I found some specs for the DP24 which suggests that a pair is not sufficient for my needs. If I'm reading correctly, one DP24 has a 65 AH capacity. A pair gives me 65 AH available, since I shouldn't discharge more than 50%. The CPAPs draw 8.0A max, total. That gives me 8 hrs for the CPAPs, alone, not counting any power consumption between charging and bedtime.
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