Two things:
- Sync of timeout
As you can see, the timeout set here is 60secs (Don’t know the default tbh).
if you are not “in-sync” with that timeout, that could be one reason. - “Discharge Limit” is Register 1040, which is only a “limit” (you tell the inverter it could only discharge until 2000W) and not the actual (dis-)charge power. for that you have to use Register 1034, which is the absolute DC Charge Power (Negative values will charge the battery, positive values will discharge the battery)
btw: If you are in Germany, please be advised, the “discharge Battery to Grid” function could be not allowed in some instances.