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post #13 of Old 03-27-2013
Maine Sail
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Re: Battery Bank Parallel or Series

Originally Posted by btrayfors View Post
It does make a difference, especially in larger battery banks.

Here's a good discussion:

SmartGauge Electronics - Interconnecting multiple batteries to form one larger bank

And these differences are measurable over time with the equipment Bill & I use.

I think EnerSys/Odyssey Battery sums it up nicely.

Odyssey Battery Technical Manual - Parallel Connections

Typically the positive and negative leads to the load
are taken from the same battery; usually the leads from
the first battery are used. This is not a good practice.

Instead, a better technique to connect the load is to take
the positive lead from one end of the pack (the first or last
battery) and the negative lead from the other end of the pack.

The two methods are illustrated above. Solid lines and
arrows indicate positive terminals and leads; broken lines
and arrows indicate negative terminals and leads.

In both illustrations, the positive leads are connected to
each other; similarly the negative leads are connected to
each other. The only difference is that in the first illustration
the positive and negative leads to the load come from the
first and last batteries. In the second case, both leads to
the load are tapped from the same battery.

The first schematic is recommended whenever batteries
are hooked up in parallel to increase battery capacity.

With this wiring, all batteries are forced to share both charge
and discharge currents. In contrast, a closer inspection
of the second schematic shows that it is possible for only
the battery whose terminals are tapped to support the load.
Implementing the first schematic eliminates this possibility
and is therefore a better one."

Deka/East Penn
US Battery

and many others, all suggest & show taking loads from opposite ends of a parallel bank or opposite corners of a series parallel bank. It is the suggested installation by every battery manufacturer I know of when wiring parallel or series parallel. As banks get larger star tapping winds up being more efficient but is harder to do correctly.

-Maine Sail / CS-36T

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Last edited by Maine Sail; 03-27-2013 at 07:24 PM.
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