Just one additional thought on this. Your converter will treat the 4 batteries as one large battery if properly wired to provide 12 VDC. Now with that being said, if 1 of those batteries starts to develop a problem and will only take a partial charge then the entire array will only charge to that capacity of the weakest battery. If not addressed it will shorten the life of the rest of the array. It's just like a multi cell flashlight, say 2 AA when one battery goes dead it doesn't work, and works/lasts better if both are replaced with new batteries at the same time. A hydrometer will be your best friend. If you don't have one get one and learn how to use. Cheap and simple.
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Marshall
2012 Laredo 303 TG
2010 F250 LT Super Cab, long bed, 4X4, 6.4 Turbo Diesel
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