Join Date: Jan 2003
Location: Maine Coast
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Originally Posted by asdf38
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.
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...
-Maine Sail / CS-36T
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