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I ordered this solar panel in January but because of weather and a family emergency, installed it on 5/3/2016. The output voltage has stayed between 10 and 11 volts and weather has been from rain to full sun.. The battery voltage is 12V. I am using a MPPT Tracer 1210RN controller and the charge indicator light has never come on. The voltages indicated were taken at the charge controller terminals and polarity was correct. I now understand that I can not return this item and would appreciate any assistance in fixing this problem. I have installed solar panels on my two previous RV's and had zero problems. After seeing such good reviews on the Renogy solar panels I am surprised to have this problem. UPDATE: Removed the panel and found one of the diodes was installed backwards. Reversed the diode, which was held in by two screws, and now the panel is working at full power. I will add that Renogy Tec. Support was easy to contact and I was told the panel would be replaced if I couldn't repair it. Lesson learned: Test it before you install it. I did use quick disconnect mounts so it wasn't a huge problem.