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Tesla Powerwall 3 now boosts heat pumps to store cheap solar as heat
Tesla has launched Heat Pump Optimization for Powerwall 3 and Powerwall 3P (three-phase). The feature tells a compatible heat pump when to heat water beyond the home's immediate needs, typically into a domestic hot water or buffer tank, to store surplus or cheap solar energy. It is available only in Europe; Tesla has not said anything about bringing it to the US or Canada. The system relies on SG-Ready, a label introduced by the BWP in 2012 that uses two relay contacts on the heat pump.…
- Heat Pump Optimization: Powerwall 3 and 3P tell the heat pump when to heat extra water.
- Requires SG-Ready, firmware 26.26+, Tesla app 4.59.1+ and a Tesla-certified installer.
- 300-liter tank: about 10.5 kWh thermal stored for roughly 3.5 kWh electricity (COP 3).
🔎 Why it matters: Heat Pump Optimization is already live in Europe for Powerwall 3 and 3P running firmware 26.26 or later. According to the article, it depends on the SG-Ready standard, which barely exists in the US and Canada.
📈 Upside: A 300-liter tank heated 30 °C stores about 10.5 kWh thermal with about 3.5 kWh electricity at COP 3, leaving the Powerwall's 13.5 kWh for loads that cannot be stored as heat.
📉 Risk: The signals are recommendations that the heat pump's thermostat can override, and the app has no on/off toggle once the installation is wired.
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