Re: Diesel batteries- two 6 volt vs. two 12 volt

Posted by n9lhm on August 11, 2007 at 04:49:46 from (70.224.62.52):

In Reply to: Diesel batteries- two 6 volt vs. two 12 volt posted by 460 albert on August 10, 2007 at 19:38:26:

The make-or-break of it is more a question of reliability when they are sitting over time. Two batteries in parallel will discharge from the one with slightly higher open-circuit voltage into the one with lower open-circuit voltage. In addition, a shorted cell in one will quickly drain the other for the same reason. But, if you know which one is bad, you can disconnect the bad one and run on the good one, since the voltage does not change.
With batteries in series, they cannot discharge into each other over time. If a cell shorts, you will still have almost as much capacity. You can"t disconnect one and run without it, though, as you will only have half the voltage.
Personally, I prefer having two sixes in series. But there are good arguments either way, and the 12"s are more readily available.

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