I logged into my POCO website where I can get daily meter readings. I did the below table for January.
Unfortunately, Sense won't let me go back further than 25 days on the daily usage stats, not sure why as the amount of actual storage this takes up should be minuscule.
The POCO obviously has some issues on 1/25 and 1/26. I got a call into them to get that adjusted. If you subtract 50,000 from the meter readings, you get variances of 1 and 2 for those days. Looks like an issue with their software.
Also, the POCO billing software does not allow for negative readings, which is why the variance is pretty high on 1/18 and 1/19. Not sure why it did not subtract 50,000 on that day.
My panels were covered with snow on 1/15, which is why the reading is negative. That -4 kWh is what was consumed by the switch, solar gateways, wireless link, and the air compressor coming on once or twice the maintain the pressure in the holding tank at the shop 200' away from the house.
So when discarding those dates, my average variance is 0.35 kWh per day, a rounding error. In my case it might be that the slight always on usage I have in the shop sub-panel that the Solar CTs is monitoring, is perfectly off-setting the otherwise slightly higher solar production I would have seen.