I got my Xantrex GT 3.3 Pos Ground inverter back from repairs at Xantrex a month ago. The ground fault without blowing a fuse issue that I was running in to was being caused by some lose screws that had apprently been missed or forgotten the first time the inverter went in for service. The issues I am seeing now are different. MY GT-View software is telling me that the inverter is operating at 99.9% Efficiency until the power gets above a few hundred watts. Even wierder still, the ACWATTS is reading higher than the DCWATTS. For example, if I am getting 145 watts DC, then I will be putting out 156 watts AC. This makes no sense to me at all, but the condition seems to correct itself above 300 watts or below 50 watts. Any Ideas?

Sounds like calibration is just off a tad for reporting of the current, it has no effect on performance of the inverter

Thanks SG. I didn't think it was any big deal because the output seems to be about right if not slightly better than last year. So which do you think is not reporting correctly, the AC watts or the DC Watts? If its the AC watts, could it be incorrectly reporting the amount of KWH generated as well?