Noob question: why does "solar" stay empty

energy_cumulative_include should be enabled I think, Bernard.

Z-wave:
When z-wave becomes slow, sluggish or unresponsive,
I would increase the powerReportinginterval interval a bit (to 1 or 2s)

Solis:
Didn’t it make a difference to remove the Solis device from Homey, update the Solis Cloud app, and then adding the Solis inverter again?
If not, you’d best contact the developer by posting here