Originally Posted by meyermobile
That's a lot of sun power! I've only got a 100w charger, and a 10 amp 120v charger, when I'm plugged in.
I guess this could lead to another question. Could the charger be set up to turn off solar automatically through a relay when plugged in? Again, so I'm not getting voltage from two places.
I have just over 2kW of PV panels - I see no reason to charge the house batteries from the alternator while driving because the panels are still generating useful power whether stationary or at 60 MPH. They actually may be more efficient while driving because they are cooled better! Use the alternator only for the start batteries: that's what it's designed to do.
I do have a pair of Blue Sea switches to connect the house battery banks to the starter, but that is just to boost the start batteries in cold weather, not to charge the house batteries while driving. I would be worried about overloading the alternator if I wanted it to charge 900aH of house batteries: my solar charge controllers can push up to 120A into the house batteries, but the 160A alternator shouldn't be used continuously at more than half its rated capacity to prevent it overheating.