My memory fades, but on our coach, the solar wire from the 100w panel goes from the panel down the refrigerator vent then to the curbside 'hidden' bay just ahead of the drive axle to the solar controller. The wire from the solar controller terminates in the electrical box above the battery tray. That one panel is only good for about 5 amps in full sun, so it won't do much to charge your batteries. If you want good info on solar look up AM Solar in Springfield Or.