I have tried values between 20W and 50W for the zero export to CT, but still have occasions when the power from the grid goes negative. This happens when the sun is shining and the load drops away or the battery reaches 100%. Suddenly excess power still gets dumped on the grid. This can be many kilowatts for many minutes at a time.
This wouldn't be so bad, but I have a prepaid meter that only goes in one direction. I get charged by the meter when I push power back, and this can be as much as 20% of my total usage. My only option has been to turn off the grid completely when I'm not using it. It is a bit of a pain to remember to turn it when needed as I cannot just leave it on standby.
Anyone have this issue or a solution?