I've got 2 85 watt and 2 100 watt panels. John Palmer installed the panels for me and said that the wire that DRV supplies will not support the wattage I am using..As far as I know and remember the wire is hidden next to the vent cap that has a melted mark on the top. When they (I helped) ran the wire we went through the utility closet into the basement..
http://www.palmerenergysystems.com/
If you have any questions John is a great guy and can hook you up with anything you might need.