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furpod View Drop Down
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Joined: 25 Jul 2011
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Posts: 6128 		Direct Link To This Post Topic: Battery Recommendation
    Posted: 08 Mar 2016 at 8:26am
Originally posted by TheBum

Originally posted by furpod

Originally posted by TheBum

Beware. Most dual GC2 boxes place the batteries with their long sides together. Those won't fit. I looked into the dual Century Plastics box and two individual boxes was about $50 cheaper, so that's the route I'm taking. I hope you luck out and find battery boxes as B+B; none of the local stores had any in stock, so I'm waiting for them to come in.

BTW, I'm going with two of the Duracell 6V 230Ah batteries (SLIGC115).


Not sure how the 2 separates can be "$50 cheaper" then the century plastics.. it's $52, and shipping was free from Amazon.
I've searched Amazon and cannot find it. How long ago did you buy yours and can you post a link? I did actually find one for $64 shipped on eBay, so it's "only" $43 cheaper.


I did the change last spring, 10-11 months ago now. I have no control over eBay or Amazon pricing, just related what I paid.

A quick google search shows 2 single GC-2 boxes are about $35-$45 to the house right now, based on the first 4 hits on Amazon. The one I used, from the place I bought it, without looking to see what they have for specials/shipping/eBay/Amazon, is $77 to the house today. (it looks like the one at $64 is the same people I bought from.) Again, I have no control over current pricing of anything. I find the single box to be a much cleaner installation, vs my sister's two separate boxes, it's also much heavier construction. Personal preference. I was just relating what I paid when I did it, and offering up an option.
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CharlieM View Drop Down
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Posts: 1797 		Direct Link To This Post Posted: 08 Mar 2016 at 9:04am
A source for the box Furpod used:

http://www.allbatterysalesandservice.com/browse.cfm/4,576.html

It shows ~$52 plus ~$15 shipping.

Charlie
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StephenH View Drop Down
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Posts: 6288 		Direct Link To This Post Posted: 08 Mar 2016 at 9:29am
I purchased two of these to use.
http://www.amazon.com/gp/product/B00316KU6E?psc=1&redirect=true&ref_=oh_aui_detailpage_o04_s00

They work well. It took finding a longer cable to wire them in series since there is some space between them, but it is working very well.
StephenH
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hogone View Drop Down
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Posts: 1042 		Direct Link To This Post Posted: 08 Mar 2016 at 10:34am
I thought I had found a dual box (black one) but I think I was wrong. if anyone stumbles upon a site with them, please let me know. I have been looking! hogone
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howmanyds View Drop Down
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Posts: 71 		Direct Link To This Post Posted: 08 Mar 2016 at 10:55am
What gauge cable should we use when wiring two GC2s in series? Is the rest of the cabling coming off the pod 2AWG or 4?
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furpod View Drop Down
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Posts: 6128 		Direct Link To This Post Posted: 08 Mar 2016 at 12:09pm
Originally posted by howmanyds

What gauge cable should we use when wiring two GC2s in series? Is the rest of the cabling coming off the pod 2AWG or 4?


I used a 4gauge starter cable from AutoZone..
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techntrek View Drop Down
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Posts: 9059 		Direct Link To This Post Posted: 08 Mar 2016 at 2:07pm
Don't fret too much over the size whether 2 or 4, since the distance is so short.
Doug ~ '10 171 (2009-2015) ~ 2008 Salem ~ Pod instruction manual
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TheBum View Drop Down
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Posts: 1407 		Direct Link To This Post Posted: 08 Mar 2016 at 4:41pm
You could probably go as small as 8AWG. We're only talking about 30A max here and, as techntrek said, it's a very short run. Automobiles can pull a lot more than 30 amps when cold starting, which is why they need larger cable.
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Posts: 71 		Direct Link To This Post Posted: 08 Mar 2016 at 4:46pm
Cool, thanks.

Now, with batteries in series, I know it's the voltage, not the Ah, that doubles, so two GC2s of 210Ah each will still produce 210Ah when in series.  But does the RC double?  I still haven't figured out if the Costco batteries have an RC of 107 at 75Amps or 25Amps, but either way, would it be a Reserve Capacity of 214 minutes when in series?

Thanks for all the battery advice, everyone!!
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CharlieM View Drop Down
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Posts: 1797 		Direct Link To This Post Posted: 08 Mar 2016 at 5:21pm
Batteries in SERIES: Voltage adds, AH and RC stay the same.

Batteries in PARALLEL: AH and RC add, voltage stays the same.

In both cases stored energy (Voltage x Current x Time) adds.

So two 210AH GC2s provide 12V at ~210AH and ~107 min RC. Actually you'll get slightly more than 210 AH since the 210 is measured at the 20 hour rate, or 10.5Amps. Your normal usage will be less than 10.5A so the battery will supply more than 210AH. Thanks to Mr. Peukert. The reserve capacity, usually specified at 25A, is essentially meaningless for RV applications.
Charlie
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OLD: 2013 RP-172, 2010 Honda Pilot 3.5L 4WD
PRESENT: 2014 Camplite 21RBS, 2013 Supercharged Tacoma 4L V6 4WD
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