I finally got a direct answer from Progressive Dynamics about isolating the battery bank from the converter. When the shore power is plugged in, the charger goes thru the battery disconnect cable to the batteries. When you don't have shore power, it uses the same cable to draw 12 volt power from the batteries. The only way to bypass the charger when plugged into shore power is to put a disconnect on the battery cable at the terminal that goes to the house battery disconnect. That is an easy solution. By doing this, I can install my own charger, just need to remember to turn off battery disconnect cable before I turn on my charger.
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