Marine Electronics Forum

Battery wiring

Old 02-24-2012, 12:49 PM
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Default Battery wiring

I have a 3 battery bank that is soley for running my 12v trolling motor. Batteries A, B, and C are all connected in parallel, plus to plus to plus and minus to minus to minus.

Does it make any difference if I hook my motor pos and neg to pos and neg on Battery A, or is it better to hook pos to (A pos) and negative to (C neg). Likewise, I use the same connections for charging.

I have been told that hooking both to one battery creates a master/slave setup that could cause uneven battery life.

Is that correct? Certainly no big deal to change if this is true.
Old 02-24-2012, 12:57 PM
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There is no such thing as a "master/slave" battery connection.

The batteries are in parallel, the voltage is the same at any combinations of positive and negative terminals, and the same current is available, assuming that the cables connecting the batteries together are sufficiently sized.

You can connect the positive cable for your motor to any positive terminal and the negative to any negative terminal.
Old 02-24-2012, 01:00 PM
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This has come up before here.

Assuming very low resistance connections between each battery in the bank (which you should have!), it makes no difference where you connect your load or charging.

There has been talk of the necessity of rotating batteries within a parallel-connected bank, but it appears that is total BS unless you have a less than optimum connection between each battery in the bank.

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