Sungrow’s Testing Center Approved to Participate in UL’s Witness Testing Data Program Updated On Fri, Dec 23rd, 2016 by Saurenergy Sungrow just announced that its testing center has been qualified by Underwriters Laboratories (UL), to participate in the UL Witness Testing Data Program (WTDP). This approval, together with those received from CSA, TÜV Rheinland, and TÜV Sud, has again proven Sungrow’s position as a technology leader in the PV inverter industry, due to the company’s […] Read more