I'm sure it combines them. The last picture above shows the big black round switch on the lower right. That allows you to select the different battery groups. If the wire from the front battering is only a small gauge wire it would not pass much amperage. Therefore not much help powering the inverter? I know that combining them works to allow the Iota to also charge the truck batteries.
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'03 Freightliner FL112, 295" wheel base, with '03 United Specialties 26' living quarters, single screw, Cat C12 430 h/p 1650 torque, Eaton 10speed , 3.42 rear axle ratio
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