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🧪 Community source Tesla Energy Energy

User seeks grid import cap to manage demand charges with Powerwall

📍 Reddit Powerwall

Unconfirmed: A user of a rural electric cooperative describes a demand charge of $4.30/kW, calculated on the highest monthly 15-minute average grid import. The installation combines 10.4 kW of solar and three Powerwalls (45 kWh total, with a 15 kW inverter limit). According to the user, the hardware could keep grid import below a set value, but the software offers no setting to fix that ceiling in kW. The user cites Self-Powered, Time-Based Control, the backup reserve, and grid-charging settings as current controls, and states that none of them allows limiting grid import.…

🔎 Why it matters: Unconfirmed: there is no official confirmation. The user states that Powerwall controls (Self-Powered, Time-Based Control, backup reserve, and grid charging) do not allow setting a kW ceiling on grid import.
📈 Upside: Not applicable.
📉 Risk: The charge is calculated on the highest 15-minute average of the month, so a single uncontrolled peak sets the amount billed.
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