The Solar screen of the Sense app (available if you have Sense Solar) shows five primary usage stats. Solar stats can be accessed by double-tapping the Solar bubble, tapping the solar production icon, or accessing the Solar card via the Trends screen.
Your total, whole-home consumption for the period selected. The given cost is based on your billing rate, if provided.
Your total solar production for the period selected. The given cost is based on your billing rate, if provided.
Your excess solar production sent to the grid. The given cost is calculated based on your sellback rate. You can set this in the Solar Settings screen.
Your usage pulled from the grid and not covered by solar. The given cost is based on your billing rate, if provided.
Powered by Solar
The % Powered by Solar number refers to the amount of consumption that is being drawn from solar, relative to total consumption.
For example, if you consume 10kWh in the same period that you produced 10kWh of solar, you would be 100% powered by solar.
However, if you produced 10kWh during the daylight hours and consumed 5kWh during these hours plus another 5kWh at night (a total consumption of 10kWh for the day), only 5kWh would actually be covered by your solar production. The other 5kWh produced would be sent back to the grid as excess production. You would be 50% Powered By Solar for that day.
Link for reference: https://help.sense.com/hc/en-us/articles/360041721793-What-solar-stats-does-Sense-provide-