@ch6to66,
Ket’s put it this way. Sense Usage is the total usage in your house, Solar or no Solar. Any contribution from Solar Production for in-house appliances, etc. has to also flow through mains and the Sense Usage clamps into your house, and will get analyzed for device signatures by Sense. Put differently Sense Usage minus Solar Production should match up with your net meter energy if you are able to look at it on an hourly basis.
I’ve been doing a fairly detailed analysis on how Sense energy data compares to my net meter and solar supplier data here, if you are interested in how it all looks: