I'm grid-tied, and aside from some extremely non-intuitive settings I've had to discover, no problems to report.
Main use cases (all successful):
- Charge batteries from PV first, but only before 4PM (peak period starts). When batteries are full, send excess back to grid.
- Zero export between 4-9PM
- 100% usage from grid at night. Do not touch the battery, except for backup power via EPS port.
- Backup power for critical circuits if the grid goes out. Related side note - anyone know what the "seamless switch" option does?
A few odd settings were made to do this:
- "Charge first" to set PV priority from midnight - 4PM, and 9PM to midnight. Why also at night? Because otherwise, the system defaults to self-consumption, which will randomly pull from battery to cover load. I do not want the battery to discharge to grid at all prior to 4PM, or after 9PM.
- Peak shaving enabled from 4-9PM, set at 0.1kW. This is to allow battery to cover excess load beyond 100W to the grid.
I have not experienced any unintended grid-sell from battery with this configuration. I can't speak for PV, since I want my excess to go back to grid.
In regards to CT, I am likely the only person on here using RS485 (modbus RTU) for metering, with no clamps directly connected to the inverter. This allows for additional tuning and programmability I won't get into here, but it's possible this is saving me from some of the CT related headaches mentioned in the thread.