System: Tesla PW3 18.86kW (site 111702)
Setup:
- Battery (Tesla Powerwall 3, Solar Export mode / self-consumption only, no battery export to grid) discharge power is posted as Extended Parameter v10 (Battery Power, W), signed convention: positive = discharging, negative = charging.
- On the Extended Data page for v10, I set Net calculation: Power (W), which per the on-page help text implements
Net = Consumption - Generation - v10. - On Edit Tariffs, both Export Model and Import Model are set to Net.
- Change was saved today (8/11) at approximately 9:27am Pacific.
Expected behavior:
From 9:27am onward, any interval where the battery is discharging to cover household load (i.e., v10 positive, grid import = 0) should be netted out of the Import/Peak calculation, so the Daily TOU chart and Credit/Debit/Balance should reflect near-zero import during those intervals.
Observed behavior:
Today’s Peak window (4-9pm) fell entirely after the 9:27am settings change. My battery was discharging to cover the home’s evening load for the entire Peak window (confirmed via the Tesla app’s own Powerwall/Grid monitoring, which is independent of PVOutput). Specifically:
- Tesla app’s Grid “Importing” graph shows essentially flat-zero import from mid-afternoon through the evening.
- Tesla app reports a $28.89 Net Credit for the day.
- Despite this, PVOutput’s Daily TOU chart for the same day (08/11/26) shows 13.261 kWh of Peak import and a $14.15 debit.
This suggests the v10 “Net calculation” setting on the Extended Data page may be applied to the Net Production/Live chart display, but is not being incorporated into the Daily TOU / Tariff billing aggregation, even though the Import/Export Model is set to Net.
Questions:
- Is the Extended Parameter “Net calculation” setting expected to feed into the Daily TOU/Tariff billing totals (Credit/Debit/Balance/Peak-Off Peak breakdown), or only into the Net Production chart’s own display math?
- If it should feed into TOU billing, is there a delay/batch process for the Daily TOU aggregate to recalculate after a Net calculation setting change, or should it apply immediately per-interval as data is ingested?
- Is there a known interaction issue between per-interval Net calculation (via an Extended Parameter) and the Tariff engine’s own “Net” Import/Export Model that I might be missing?
Happy to provide screenshots (Extended Data settings, Edit Tariffs settings, Daily TOU chart, and the Tesla app’s Grid import graph for the same day/window) if useful for troubleshooting. Thanks in advance for any insight.