Originally Posted by rb4x4
Sorry I forgot to mention it is here at the house and plugged in to shore power.
If you have a 3 stage charger that will float charge the batteries I would allow it to do that. If the charger won't take care of the chassis batteries I would look at the battery tender as others have suggested.
I recently added a DVSR Cluster from Marinco. The relay connects when charging from either the engine or from the house side and disconnects when the voltage drops so not to drain one or the other. It also has a battery switch for each battery bank and an emergency parallel switch which was something my coach did not have.
1997 Tiffen Allegro Bus 37', Cat 3126