e57- thanks for the welcome! The inverter is is hooked to a big deep cycle battery, which is charged by a 130 amp rated diode type isolator. Basically there are two big diodes that let the alternator charge both the primary and secondary batteries, but the current can't go the other way so one battery won't drain the other. It works pretty well. The chargers are zip-tied to the top shelf in the bin, this way they are always ready for action. One thing I also added was a big relay inline with the power wire going to the isolator. The coil of the relay is turned on by a toggle switch and indicator light on the dash. If you don't have this feature, you will eventually forget to turn the isolator off one day resulting in a VERY DEAD battery. I speak from experience! [Linked Image]