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Old 01-26-2016, 07:49 PM   #1
Senior Member
Join Date: Jan 2015
Location: Englewood FL
Posts: 1,861
Factory Battery Bank Wiring

I was looking through some posts today and navigated to a discussion about multiple battery banks. On my 335DS I have 4 Group 27 12 volt batteries. Current loads can get high since I have two inverters. A 2000 watt unit for the residential refrigerator and a 1000 watt unit for televisions and all the plugs on the drivers side. I recently installed a Trimetric and highly recommend it to anyone who has inverters and wants to manage their state of charge. Anyway I hit a very good discussion on the best cabling design for a multiple battery bank. Interested, I checked my coach and found what appears to be less than optimal wiring. Oh the voltage is fine, but 1 of the batteries is heavily loaded, 2 are less loaded and the 4th is very lightly loaded. Honestly it makes sense for heavy loads...and why have 4 batteries if you don't have heavy loads? Besides it is a matter of battery discharge and overall battery life. Makes sense that for battery banks, you don't get points for neatness, you get points for matched resistance!

Here is a picture of my bank.

And here is a diagram of how it appears to be and how it should be.

I wonder if others might have the same issue. I should be honest here and indicate that perhaps when I installed my Trimetric I could have moved a line, but I don't recall doing anything like that. I am assuming that all of the leads are identical in length (therefore resistance.)

Anybody else?
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2015 335DS
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battery, factory, wiring

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