Submitted by nick on Tue, 2020-01-07 13:57
I wanted to put this out there to see if anyone else is running into the issue i'm seeing. I have a single PW2 with a 9KW solar system - both were installed by a local installation company which is a certified PW2 installer. After a few months of operation, i've noticed that what the PW2 says i've pushed back on the grid differs greatly with what my utility, Duke Energy, is giving me credit for. AFAIK i'm supposed to get 1:1 credit for the kHh I push back on the grid, but the numbers just don't line up. For example, one recent month I delivered 200kWh to the grid per my PW2's data, but Duke says it was 19kWh. This is way too big to be a measurement accuracy error. FWIW the PW2 reports almost the same value for solar generation as my SolarEdge inverter reports. Also, the last bill showed that the total from the grid was with 1% of what the PW2 reported. I suspect that Duke isn't measuring my meter correctly as its a CL320 meter (most houses are CL200) and doesn't appear to have the same radio in it as the rest of the neighborhood. When the meter read truck comes by each month, the dude has to get out of his truck and do a manual read - so i'm wondering if they are just not grabbing the proper parameters from the meter.
anyhow, wanted to see if anyone else may have run into this situation and where you might be with resolving it.