[jcus]

This is good discussion. A 160 amp unit should be plenty.

However, one should always avoid charging low house batteries using the engine alternator unless you have the big 50dn. I really do think that is the major cause of alternator failure in RVs including Newells. My opinion, your alternator.

I agree, if solar or shore power has not kept my batteries up, I will run gen. and let inverter/charger bring them up to at least 90% [by trimetric], before securing it and letting eng alternator take over.