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  #11  
Old 12-01-2010
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I'm tentatively leaning towards four of the US Battery US2200's based upon comments I've read in this forum. I may want to do some research on the CG2 batteries sold by Sams Club and manufactured by Johnson Controls. I have no idea how they compare to the US2200's so would not go that route unless I found some real data to back them up.
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Old 12-01-2010
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I'm tentatively leaning towards four of the US Battery US2200's based upon comments I've read in this forum. I may want to do some research on the CG2 batteries sold by Sams Club and manufactured by Johnson Controls. I have no idea how they compare to the US2200's so would not go that route unless I found some real data to back them up.

The US2200 is an excellent & well built battery. US specifically buids this as their T105 killer and a number of manufacturers have made the move to US from Trojan such as Yamaha and Club Car in the golf industry. This battery has severely eaten away at Trojan's market share.

The Sam's Club Johnson Controls batts are a good battery at a great price but arguably not as well built as a Trojan, US Battery or even Crown. They should still last a good long while though if cared for. If you can get the US2200 for under $100.00 it is a great value. I don't know if it is really worth any more than a $25.00 - $30.00 spread though per battery from the JC product but that is a decision you'll have to weigh...

I know many with the Sam's Club 6V's who are extremely happy with them.
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  #13  
Old 12-01-2010
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Quote:
Originally Posted by Maine Sail View Post
If you can get the US2200 for under $100.00 it is a great value. I don't know if it is really worth any more than a $25.00 - $30.00 spread though per battery from the JC product but that is a decision you'll have to weigh...

I know many with the Sam's Club 6V's who are extremely happy with them.
Thanks. Based upon my research, I can get the Sams Club GC2 battery for $82 and the US2200 for $114 locally or $100 if I'm willing to drive 250 miles round-trip. All prices are outright (ie, not exchange) prices.
Pete
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Old 12-04-2010
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Quote:
Originally Posted by prroots View Post
I'm tentatively leaning towards four of the US Battery US2200's based upon comments I've read in this forum. I may want to do some research on the CG2 batteries sold by Sams Club and manufactured by Johnson Controls. I have no idea how they compare to the US2200's so would not go that route unless I found some real data to back them up.
So how come it makes sense to have four 6V's instead of two or three 12V's?
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Old 12-04-2010
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So how come it makes sense to have four 6V's instead of two or three 12V's?
More amp hours with 4 6V, 440-450 Ah's for 4 standard GC batteries, when compared to three 12V of a similar case size. 6V's have thicker plates internally which means longer cycle life with 6V batts than with 12V batts. Also less money $$ per Ah, and available world wide..
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Last edited by Maine Sail; 12-04-2010 at 10:54 PM.
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Old 12-04-2010
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Four GC2 type batteries give you about 400 amp-hours at 12 VDC. You'd need to have two 8Ds to get about the same capacity, but an 8D weighs 140 lbs... and is a PITA to install or remove.

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So how come it makes sense to have four 6V's instead of two or three 12V's?
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Old 12-05-2010
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Ok, for what its worth I ran the energy density numbers and the larger 12V's come out just a bit on top. Thats what you'd expect simply due to economies of scale.

US2200
232AH * 6V *1000 = 1,392,000 mWH
260mm*181mm*286mm = 13459160 square milimeters

Total : 0.1034 mWH per square milimeter

US 31 DCXC

130AH * 12V * 1000 = 1,560,000mWH
330mm*171mm*248mm = 13,994,640

Total: 0.1115 mWH per square milimeter
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Ok, for what its worth I ran the energy density numbers and the larger 12V's come out just a bit on top. Thats what you'd expect simply due to economies of scale.

US2200
232AH * 6V *1000 = 1,392,000 mWH
260mm*181mm*286mm = 13459160 square milimeters

Total : 0.1034 mWH per square milimeter

US 31 DCXC

130AH * 12V * 1000 = 1,560,000mWH
330mm*171mm*248mm = 13,994,640

Total: 0.1115 mWH per square milimeter
Yes and four group 31's will be 520 Ah's and four US2200's will be 464 Ah's. BUT the US2200's will last a considerably longer and take up less floor space than four group 31's. Remember that 12v batts have 6 cells in them and thus each plate is quite a bit thinner. Each 6V battery has only 3 cells thus the battery plates are much thicker and you will almost always get a longer cycle life from them.

A more fair comparison is a GC2 size to a group 24 as they are closer in floor foot print though the GC2's are slightly taller...
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Old 03-10-2014
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Re: Best battery monitor for the buck

Iím dusting off this old thread to give a headís up that Victron is apparently discontinuing the BMV-600s battery monitor and releasing a new 700 series in its place this spring. I found one vendor (not sure if Iím allowed to state the name, but can be found with a search engine) selling the 600s on clearance for just a little over $100. This is an amazing price for a really useful device and I donít imagine it will last long. I definitely couldnít pass it up. At that price, itís cheaper than a lot of simple marine grade digital voltmeters.
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