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Old 04-04-2016, 20:34   #16
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Re: Is high current draw bad for deep cycle batteries?

Originally Posted by tinkrman69 View Post
With multiple batteries run in parallel, the draw is not always equal on all batteries in the circuit. Its funny you mention plumbing, as it's very similar in many respects.

In a plumbing situation, say, you have two equal tanks sitting on a level plane. you plumb a 1/2 drain pipe from both tanks to a 1 inch pipe at the same point, one foot below the level of the tanks. one tank is two feet away and the other tank os 100 feet away. Due to the friction/resistance in the pipes the nearer tank will empty first.

in a battery bank run in parallel whilst a draw is present the last battery will contribute the least and like wise receive charge last. electricity flows the path of lest resistance or the shortest path. in essence, the successive batteries from the back foreword would drain into the previous battery. If all the batteries in a parallel circuit were wired to a single point respective of + and- with all cables the same length and size and the load taken from that point, then you would have an equal draw and recharge of the batteries in that bank

unlike plumbing, if you increased the wire size of the jumper from the back battery the resistance in the wire would increase too. A physicist might be able to figure a balance, but electrolysis in the wire would change the balance in time. Its easier and longer lasting to wire it to a central point. Say #4 jumpers coming into a #2 wire or #2 jumper wires into a 00 wire and so forth.
Understood, thank you. Does this mean that ideally I should rotate my batteries, say annually, so the one furthest from the buss bar is swapped with the one nearest the buss bar etc thus helping to equalise the work they all do over their life?


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