Good analysis. Three thoughts.
- My SolarEdge data has come via the Solar City website, then via the Tesla app, so perhaps it’s offset from the direct SolarEdge data. I discovered that I had a time offset between Sense and Solar City a while back when my straight line became a loop.
How Accurate is Sense vs. Utility Metering? - #12 by kevin1 - From my experience, and that of others on the forum, inverter readings run about 3-5% higher than Sense. But the combined Sense net calculation ends up much closer to my hourly utility net readings vs. combining Sense Total Utilization with inverter solar data. So treat the Sense solar reading as more accurate than the inverter data. Take a look at my fit lines - slope is 1.03 (inverter is 3% higher).
- It might be easier to pick out the errant points if you charted, analyzed and fit multiple days worth of data in one shot, to give regression a broader statistical sample.