A funny thing happened on June 10, 2026. My Tesla app started showing zero exports to the grid whereas before that I always had exports going to the grid once the powerwall batteries were fully charged (solar goes to charge the batteries until full, then excess to the grid). I also noticed that my reported Home Kw Use nearly doubled from what it is normally every day once the batteries got full, and the Home Use curve was mimicking the Solar Generation Curve.
After a month of troubleshooting with Tesla Support, turns out a glitch got into my system somehow on June 10 that caused this error in the App data reporting. Fortunately, the electrical company still received the correct amount of Grid Exports to give me credits as they do not rely on the Tesla data but on the meter itself.
So exported energy was being incorrectly allocated to Home usage rather than Grid export. While the Powerwalls were charging, all energy flows were normal. On July 19, Tesla pushed Gateway firmware 26.10.3 (build 4f924de8) into my system which fixed the problem. After the update, Grid Export and Home energy accounting returned to normal.