OK. I understand better now. Thank you for that description. Doing it
without isolation also solves the problem of how to do solar charging
(my solar controller is only for one battery).
You're not kidding about the mounting options. I took Optima to heart
and mounted both batteries on end. I hope they live up to their claims,
but I've seen much anecdotal evidence that they do.
C
"Dr. Gerald N. Johnson, electrical engineer" wrote:
>
> If you keep the two batteries in the trailer decently matched (same age,
> same maker, same size, same specific gravity), they will give you the
> most energy wired in solid parallel. The internal construction in each
> cell is plates in parallel. Paralleling batteries is the same concept
> but with copper wire involved. The diode drop will cost you probably 40
> or 50% of capacity by not getting the two batteries charged. Worse with
> the two isolated batteries you'd have to split and make a perfect split
> of your trailer loads to get full energy from both batteries. You'll get
> more utility from them paralleled without diodes.
>
> There will come a time when one battery discharges into the other. Then
> its time for a new PAIR of batteries. It probably would have happened at
> about the same time of life with one big battery, but two fit the
> battery space better than one.
>
> Gerald J.
>
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