Originally Posted by Boyd
Thanks for the information, I always feel more confident after sitting in your class.
My rig/coach (Not including the engine battery) has a total of four 12 volt batteries. One is a 60 Ah from the factory and three aftermarket 140 Ah. I think that totals 480 Ah when wired in parallel. But, here again, I'm the student.
Thanks Herk, later, I'm going battery shopping.
Sounds like you have plenty!
However I would remove the 60 AH battery and replace it with an exact duplicate of the remaining three. The lower capacity battery is a drain on the system since the other three will be constantly trying to charge the 60 AH battery. When wired in parallel cells with equi-length battery cables like they are supposed to be, the drain is evenly distributed over all four batteries. This causes the 60AH voltage to drop lower then the other 3 as its capacity is used up before the others.
While the photo is of 6 - 6 volt batteries; for explanation purposes treat the 2 sixes as a single 12 volt battery. So:
Here is how a 3 battery bank of "12 volt batteries" is wired as three "cells". A four battery bank would be wires similarly. Remember the positive lead from the camper goes to the FIRST battery positive and the negative lead goes to the LAST battery in the bank.
The attached article explains it better than I can.
Lou and Laura with Bella - German Short Hair Pointer
2008 GMC Sierra 2500HD Crewcab SB Allison Duramax
2010 Flagstaff 8526RLWS - Superglide 3300
HAM CALLSIGN - KC3FFW