Hey yall, found this thread through Google. Has anyone got these working? I have 12 of the t5 panels purchased from a solar liquidator in Texas. They are in three strings of 4 installed on my roof with pressure treated lumber framing, and I am getting very low output back to my MPP 5048 inverter. The aluminum version of the Sunpower panel uses positive grounding. I'm just wondering if these panels have issues from not being grounded at all. I read there could be low output if you didn't ground positive ground panels. I actually got another set of aluminum framed SPR 305 watt panels and the voltage output is 60 volts in full sun, vs 54 on the T5 panels. Specs should be the same. Still, 12 panels 54 volts should be pushing some power. I guess the difference in voltage is age, but less than 1 watt PV input from 3600 watts in full sun? Geez