Join Date: Jan 2003
Location: Maine Coast
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Re: Battery capacity - Peukert stuff
The Peukert number for a given battery does not change when the individual batteries are placed in parallel. For example a 100Ah 12V battery with a Peukert of 1.25 will still have a bank Peukert of 1.25 when you have four in parallel for 400Ah's. So the Ah capacity of the 4 100Ah batteries in parallel is 400Ah's with a Peukert of 1.25.
One one hundred Ah battery will support a 5A load for 20 hours before hitting 10.5V
Four 100Ah batteries wired in parallel will support a 20a load for 20 hours before hitting 10.5V. Go above the 100Ah load of 5A, with a single 100Ah battery, and you have less capacity. Go above the 20A load on a 400Ah bank and you also have less capacity. Conversely use less than 5A or 20A and you'll get more than 100Ah's or 400Ah's....
-Maine Sail / CS-36T
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