I'm replacing the inverter in my tractor with a Multiplus-II and am looking for advise for the best way to go with my current battery banks. The truck came from the factory with 2 battery banks, The "truck" side consists of (4) Lead Acid group 31 batteries. The "house" side has (4) AGM group 31's. I'm sure you see the problem already.... I'm changing out the "truck" bank to AGM's.
They are connected through a solenoid, or combiner, controlled by a battery management system (BMS) that consists of shunts on either battery bank. When I am driving down the road the BMS closes the solenoid and charges both banks through a 300 amp brushless alternator. When I'm parked the system runs off of both banks until the truck side falls to 12.6 volts. At that time the BMS opens the solenoid, disconnecting the truck bank, and continues to run off the house bank until they are depleted. Once depleted the BMS then auto starts the truck, bumps the idle and runs for approximately 1 hour to recharge the batteries as much as possible and the process starts over.
Besides the obvious mixing of battery chemistry that I am resolving by switching out the truck batteries with matching AGM's does anyone see any other issues I may have? The reason for all this is I have frequent issues with the lead acid batteries and my original inverter (Xantrex Freedom HFS 2000) just fried. I'm concerned with the house batteries being depleted far more than the truck batteries, then through either the alternator or the shore power of the inverter, overcharging the truck batteries.
(4) Group 31 Interstate AGM-7's
Rewire both battery banks to Inverter with 4/0
GX Touch 50