Changelog

During winter operation (ambient temperatures below 0 °C), the ground source heat pump consistently consumed over 50 kWh per day. This level of consumption had a noticeable impact on the electricity bill and was not aligned with: the building's actual heat demand, the thermal inertia of the ground loop, or efficient compressor operation. The system was running on mostly default, conservative settings with no fine-grained control over priorities and schedules.

The configuration changes were applied on January 26. This section evaluates their impact using real electricity consumption data and outdoor temperature data from the heat pump itself, ensuring consistent and comparable measurements. Raw Consumption Overview (Timeline) Daily electricity consumption data from SolarEdge shows: January (before optimization): Typical daily consumption: 45-55 kWh Multiple days exceeding 50 kWh, even at moderate winter temperatures Late January (immediately after optimization): Short-term reduction in daily consumption Several days in the 40-45 kWh range February (after optimization, very cold period): Daily consumption often again exceeded 50 kWh This coincided with significantly lower outdoor temperatures, including periods below -10°C and down to approximately -15°C 📈 Consumption timeline (SolarEdge): consumption January consumption February Weather Context Outdoor temperature data used in this analysis comes directly from the outdoor temperature sensor

How domestic hot water can be used as a thermal energy buffer to absorb excess PV production in a SolarEdge-based system operating under net metering, where exporting electricity to the grid is financially inefficient. A real-world look at control strategies, efficiency limits, and the actual impact on self-consumption-without using a battery.