brulaz wrote:
JRRNeiklot wrote:
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Two 6 volt Trojan J185H-AC 390 AH batteries.
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Just looked Trojan J185H-AC up and can only find a 12V, 225Ah Trojan deep-cycle FLA battery. These are big 12s. If you have two of them in parallel, that's 450Ah. Not too shabby, might even have less V drop than a similar Ah 6V golf cart battery bank.
Pretty hard to find two 6 V golf cart bats that would give you 390Ah.
a pair of the trojan 12V WILL give less voltage drop than two GC. For two reasons. First, each battery is supplying 1/2 the load current, unlike a pair of GC where each battery is supplying ALL the load current. Second, the Trojan 12V deep cycle have much lower internal resistance than the trojan GC. more and thinner plates.
The downside even with the trojan 12V is they are not rated for as many charge discharge cycles nor as deep a discharge. trojan says 50 percent at most on the 12V while the GC 6V can go to 25 percent and still beat the 12V on cycle life.
but even the trojan 12V have a cycle life few users would ever experience in 5 + years.
In fact I suspect that a pair of trojan 12V will have less voltage drop than 4 trojan GC. Even with 4 trojan GC, I see noticeable voltage drop AT the battery terminals with a 100A load
