Hate to ask, but is the battery charger turned on and the LED visible?
If it is then check the voltage on the cables going to the batteries, it may have a problem
Does your generator have 12v as well as 120/240?
If it don't have 12v and your sure it is charging the batteries when running, again check the cables going from the charger to the battery bank and compare that with the voltage when on shore power
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