battery charging

[WorkerB]

Scattershot,
My 2850RK has a 45 Amp charger/converter. The newer Monty's have 75 and 80 Amp chargers built in. Are you suggesting charging the batteries with your 85 Amp charger built in the Monty AND ALSO plugging in a 15 Amp charger from home into the genset to increase the charging amperage? I would say not a good idea. Usually the batteries will accept a higher charge but in a very short time you will see that the current output of the charger will drop. I watch mine closely and even though my charger CAN put out 45 Amps the batteries are only accepting between 8 to 20 amps. It's the internal Resistance of the batteries that determines how much current from the charger is required. Usually the built in charger is sufficient. Hope that helped.
On EDIT: You said your charger was not the most efficient. Hamrad had it right, maybe it's time to replace the original charger.
Hamrad! What are you doing up at 3:20 AM?
John