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Old 03-16-2015, 11:54 PM   #31
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I have dual Interstate SRM-27's and they perform well, however they are only a year old. Time will tell but I'm very optimistic they will provide years of service.
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Old 03-17-2015, 12:11 AM   #32
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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.
When you wire them in parallel you add the Ah, so if they are both 65 Ah wiring them in parallel will give you 130 Ah. You'd be a lot better off with 2 true deep cycle batteries that will be in the 100 Ah range each for a total of around 200 Ah.
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Old 03-17-2015, 01:10 AM   #33
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When you wire them in parallel you add the Ah, so if they are both 65 Ah wiring them in parallel will give you 130 Ah.
I understand to add the capacity but don't I then divide by 2 to determine the usable capacity? I've read they should never be discharged more than 50%?
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Old 03-17-2015, 01:33 AM   #34
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Originally Posted by chriscowles View Post
I understand to add the capacity but don't I then divide by 2 to determine the usable capacity? I've read they should never be discharged more than 50%?

It is considered a "best practice" to not deplete below 50% for longevity purposes, but it's not the end of the world if you go a little below occasionally. When discussing battery bank capacity though, you normally talk total Ah capacity (because it's there if you NEED it).
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Old 03-18-2015, 05:44 PM   #35
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Stopped at Costco in Oshawa today. They have Kirkland brand deep cycle batteries which are supposed to be made by Johnson Controls.

Group 24 has a 95 Ah rating @ $95
Group 27 has a 115 Ah rating @ $105
Plus $10 core charge without an old battery trade-in
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Old 03-18-2015, 06:42 PM   #36
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Stopped at Costco in Oshawa today. They have Kirkland brand deep cycle batteries which are supposed to be made by Johnson Controls.

Group 24 has a 95 Ah rating @ $95
Group 27 has a 115 Ah rating @ $105
Plus $10 core charge without an old battery trade-in
The specs are exaggerated. NO Group 24 or 27 has amp hours that high.
Figure 10-15 amp hours less than that in actual use situations.
That is not a slam...just advice. Make sure there is NO mention of starting or cranking amps on the label or you are probably looking at DP batts...but nothing wrong with JControl batts in general....but never have seen a true deep cycle from them other than in 6V

EDIT: Looking at some JC group 24 batteries on their web site...I see a RESERVE CAPACITY spec of 95 amp hours...Could you be confusing this with 20 hour ratings which are different and typically in the 75 amp hour range for this size battery?
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Old 03-18-2015, 06:59 PM   #37
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They likely are optimistic. I know they aren't pure deep cycles because they state cold cranking amps. The labels say Amp-Hours.
http://www.costco.ca/kirkland-signature-batteries.html
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Old 03-18-2015, 07:12 PM   #38
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BTW, Trojan claims 115 Ah for their 27TMH battery and 105 Ah for their 27TMX model.
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Old 03-18-2015, 07:15 PM   #39
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Before I turned to the Dark Side and purchased an 8 MPG motorhome, I had an electric Chevy S-10 pick-up truck. It was powered by 24 East Penn Deka 6 volt golf car batteries (144 volts total). The Deka batteries worked great and never had a single failure during 4 years of daily driving. Sam's Club sells the Deka golf car batteries under the Duracell brand in some locations. Other Sam's Clubs sell an Energizer branded battery which I think is made by Johnson Controls. It depends on what part of the country you are located in.
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Old 03-19-2015, 02:52 PM   #40
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I find it strange no one mentioned six volt batteries. Two six volt deep cycle batteries are much better than one 12v and will last for years.
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