Battery capacity |
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Denver poddie
Newbie Joined: 05 Jan 2017 Location: Colorado Online Status: Offline Posts: 11 |
Topic: Battery capacity Posted: 09 Apr 2018 at 9:10am |
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Denver poddie
Newbie Joined: 05 Jan 2017 Location: Colorado Online Status: Offline Posts: 11 |
Posted: 09 Apr 2018 at 9:49am |
Hey Stephen, thanks for the input, check out this interstate battery I found, unless I am reading it wrong it has 210 ah, if you could check it out for me - interstate deep cycle SRM -29
https://www.interstatebatteries.com/products/srm-29?productLine=rv&subcategoryKey=&ignorecategoryid=true
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Happy Tripping
Senior Member Joined: 27 May 2014 Online Status: Offline Posts: 473 |
Posted: 09 Apr 2018 at 12:46pm |
Group 29 weighs 60 pounds, is 13 X 6 3/4 X 10 inches, Group 24 weighs 46 pounds, measures
11 X 6 7/8 X 9 1/2. Two 6V golf cart batteries weigh 61 pounds. Might be simplest to just upgrade to Group 29 unless you are really serious about batteries, which I am not. Does the built-in R-Pod battery charger have the 'oomph' to keep a Group 29 charged?
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StephenH
podders Helping podders - pHp Joined: 29 Nov 2015 Location: Wake Forest, NC Online Status: Offline Posts: 6297 |
Posted: 09 Apr 2018 at 1:21pm |
The Interstate battery looks interesting. Make sure it will fit in the battery bracket. Interstate's site does not do an "apples to apples" comparison for "reserve capacity." The usual rate for comparing is the 20 hour rate. That is not addressed on Interstate's site for their 12V Deep Cycle batteries. I would be interested to see what the 20 hour rate is. It might not be quite so attractive.
Compare the GC2 batteries on their site and see that while the 25 hour rate for the GC batteries are 447 and 383, the 20 hour rates are 225 and 210 which is significantly less. I think you would find the 20 hour rate to be about half the 210 AH 25 hour reserve capacity or about 100 AH. That makes the Interstate batteries much less attractive. |
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StephenH
Happy is the man that findeth wisdom,... ouR escaPOD mods Former RPod 179 Current Cherokee Grey Wolf 24 JS |
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furpod
Moderator Group - pHp Joined: 25 Jul 2011 Location: Central KY Online Status: Offline Posts: 6128 |
Posted: 09 Apr 2018 at 2:25pm |
Two group 29's will not fit on the factory rack. The most amp hours for an unmodified mounting solution is 2 GC2's. If planning on a single 12v solution for more aH's.. go with a deep cycle marine group 29 or 31. 1 of them will fit.
Battery capacity and robustness is very tightly linked to weight.. generally a heavier battery is "better".. Please note, 2 golf cart batteries do not weigh 61 pounds.. they weigh 61 pounds +/- EACH. |
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CharlieM
Senior Member Joined: 23 Nov 2012 Location: N. Colorado Online Status: Offline Posts: 1797 |
Posted: 09 Apr 2018 at 5:37pm |
Time out here. Reserve capacity is Minutes at the specified current, not ampere-hours. The specified 210 reserve capacity is 210 minutes at a 25 Amp load (210/60 * 25= 87.5 AH). Given the 59.7 pound weight that's about right but a little low for a good Gr 29 deep cycle battery. As Furpod notes, battery capacity energy storage is roughly proportional to weight: more lead equals more energy storage. Two true deep cycle 12V batteries weighing a total of 120 pounds will store about the same energy as two 6V golfers. No free lunches here. Such deep cycle 12V batteries are available but they are hard to find.
Battery cells like to operate in series, not parallel. Then all cells charge and discharge equally. The only advantage of parallel 12V batteries is redundancy in case of failure. Swapping two 12V batteries in and out forfeits a percentage of available capacity due to Peukert's Law. For a given capacity two 6V golfers in series is the best way to go. |
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Charlie
Northern Colorado OLD: 2013 RP-172, 2010 Honda Pilot 3.5L 4WD PRESENT: 2014 Camplite 21RBS, 2013 Supercharged Tacoma 4L V6 4WD |
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Denver poddie
Newbie Joined: 05 Jan 2017 Location: Colorado Online Status: Offline Posts: 11 |
Posted: 09 Apr 2018 at 8:20pm |
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Denver poddie
Newbie Joined: 05 Jan 2017 Location: Colorado Online Status: Offline Posts: 11 |
Posted: 09 Apr 2018 at 8:24pm |
Ok thanks all for the input! looks I am going to two 6v GC batteries, one last question what brand/battery should I go with? Stephen what brand are u running couldn't tell- Duracell?
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StephenH
podders Helping podders - pHp Joined: 29 Nov 2015 Location: Wake Forest, NC Online Status: Offline Posts: 6297 |
Posted: 09 Apr 2018 at 8:39pm |
Duracell from Batteries + Bulbs, 215AH SLIGC110 $89.99. Order online for pickup in store and save 10%. If you are a Sam's Club member, check their site. I don't know if it would be any less expensive there but they do have GC2 batteries listed at $84.52. Don't forget to add the core charge that your state requires plus any taxes for the final cost. For where I am in NC, the core deposit (refundable) is $21 each.
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StephenH
Happy is the man that findeth wisdom,... ouR escaPOD mods Former RPod 179 Current Cherokee Grey Wolf 24 JS |
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Denver poddie
Newbie Joined: 05 Jan 2017 Location: Colorado Online Status: Offline Posts: 11 |
Posted: 09 Apr 2018 at 9:33pm |
Ok thanks those are good prices, can you remember where and what you bought for your battery box for this set up
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