Figuring out correct grid import/export values in multi-powerwall installations.

[rustyshelf]

There's been a recent API change to the history and calendar_history endpoints in the Tesla API that seem to make grid usage harder (or impossible) to accurately figure out.

Previously to figure out grid use you could add app battery_energy_imported_from_grid and consumer_energy_imported_from_grid. Same for grid exports grid_energy_exported_from_solar + grid_energy_exported_from_battery. After the recent change, this seems to return values even if nothing has been imported or exported. So at midday I can see values like 3300W imported and 3300W exported from the battery, even though in practice nothing has been exported from the battery or solar to the grid, or imported. Checking the Tesla app shows 0.1kWh imported, 0.1kWh exported which I assume is the small amounts of regular pings it uses to check the status of the grid. The issue is I can't figure out at an API level where it's getting those values from anymore. Has anyone else seen this?

I don't know if this API now includes values of the batteries balancing between each other, or something else but long story short single battery installs still return values that match the Tesla app, while multi-battery installs don't. The Tesla app had this same bug for a very short time and used to show these higher values until they updated it. I'm hoping someone out there knows why?