This is the address of their subsidiary SolRayo, Inc., 4005 Felland Rd Ste 107 Madison, WI 53718 It's tough to see but they were still in biz at the time of this street view. Right side of sign, second name down. https://www.google.com/maps/@43.1440973,-89.2757373,3a,15y,76.35h,84.44t/data=!3m6!1e1!3m4!1s7tDBjMXbBk8k7ZbZH4P1iw!2e0!7i13312!8i6656!6m1!1e1