pianotuna wrote:
Hi,
The 12.9 cut out and the 13.4 connect are why I don't think the "smart" relay is a good idea. Particularly if an inverter is in use the battery voltage may drop. At least one converter goes to 13.2 when it is in "float" mode. That means the "smart" relay will not maintain the chassis battery.
Those are some of the reasons I recommended a simple inexpensive continuous duty solenoid relay.
I don't quite understand. How this isolator works is it makes a connection between the aux and main battery if
either battery reaches 13.4v. If I am driving somewhere the main battery will be over 13.4 (more like 14.4V) and there will be a connection, charging the rv battery. If there is something in the coach drawing so much power that the truck charging system wont handle it, dragging down the alternator to under 12.9v then the connection will be cut, but the 20 amp fuse on the aux circuit to the camper will have blown anyway so that will never happen.
