BTW, if you are considering 500 watts of solar think about this. At 19VDC, operating voltage of Zamp panels, 500 watts is 26.32 amps, just barely gets your 20% safety margin squeezed in. Now the Zamp controller will convert that into some amps at 13.2 - 14.7 VDC on the long 8 ga wire run. Nearly as I can tell that is about 25 ft one way run, 50 ft circuit. All in a coach only 25ft long? I would plan on around 400 watts max if you plan on keeping the Zamp controller and making some wire changes. All up to you but the wiring drops pretty much straight down from the controller into a large bundle in a plastic conduit, runs to the front and the POS goes into the cavity below the passenger seat to a 30 amp button reset breaker, then to the battery POS red cable. The NEG branches directly to the battery NEG lead, most negative.