Join Date: Apr 2006
Location: Spokane, WA
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Sure, it’s what I stated up front.
Paralleling batteries is a practical, safe and reliable way to increase battery system capacity on a boat. Paralleling is naturally redundant and a bad battery will not take your battery bank down, nor will it ruin the remaining batteries in the group. A bad battery will reduce the capacity of the total system only by its own loss of reserve capacity. Paralleled batteries will NOT self discharge into each other and the total capacity of the system is the sum of the individual capacities of the individual batteries.
A single battery bank will not increase the total reserve time over two individual banks, assuming they are both of equal total capacity, but it will simplify charging and help eliminate over-discharging one bank by human error, i.e. forgetting to switch banks.
Parrelled banks will have a higher reliability then a single large bank as not only the batteries are parrelled but so are some of the connections (that’s not to say that a single connection failure cannot bring down both parrelled and series battery banks, but there are a fewer number of connections in a parrelled bank that can bring down the entire system.)
In short, paralleling batteries works, and has some advantages over series individual large cells.
There are two types of fools...
One says this is old, and therefore good..
The other says this is new, and therefore better...