We have a groundwater heat pump, an electric heating element for hot water, and a 10 kW solar system with a 25 kWh (27 kWh) battery storage.
Now in winter, the solar system produces practically nothing. The electricity demand is supplied from the grid.
The system shows the daily electricity consumption.
What I don’t understand about these curves is the electricity demand around 4:00 AM. At that time, we are sleeping, and except for the heat pump, no electricity should be needed. I am not aware of any timer switch that turns anything on at that time.
What could that be?
Best regards,
Bernd
Now in winter, the solar system produces practically nothing. The electricity demand is supplied from the grid.
The system shows the daily electricity consumption.
What I don’t understand about these curves is the electricity demand around 4:00 AM. At that time, we are sleeping, and except for the heat pump, no electricity should be needed. I am not aware of any timer switch that turns anything on at that time.
What could that be?
Best regards,
Bernd
marienschatten schrieb:
We have a groundwater heat pump, an electric heating element for hot water, and a....@KarstenausNRW – the respected boxwood is not entirely wrong; the hot water is (for some reason) produced by the electric heating element – so it is probably stored in the hot water tank, and possibly the legionella prevention cycle is regularly performed. @marienschatten – not all experts here in the forum are skilled at reading coffee grounds, so you will need to provide some solid data to support your points.
R
RotorMotor19 Dec 2023 07:28I still suspect the issue is with hot water.
Have you checked if there is a timer program set for it?
Have you checked if there is a timer program set for it?
M
marienschatten19 Dec 2023 07:45The heat pump heats the domestic hot water up to 40°C (104°F), and the electric heating element raises it further to 55°C (131°F). These are shown as the small icons on the graphs, but the heating element never runs for more than one hour continuously. The heating element is controlled solely by the thermostat; there is no timer program.
The unusual electricity consumption around 4:00 a.m. first appeared on October 1, 2023, and has occurred daily since then. It cannot be related to the outside temperature, as that was not the same every day.
It remains a mystery!
The unusual electricity consumption around 4:00 a.m. first appeared on October 1, 2023, and has occurred daily since then. It cannot be related to the outside temperature, as that was not the same every day.
It remains a mystery!
I cannot see any unusual peaks consistently occurring at 4 a.m. in the provided charts. The consumption appears to be related to compressor start-ups throughout the day. The spike around 4:15 a.m. is probably due to the heating element switching on, just like at other times. @marienschatten where do you see the mystery?
My question is: does the domestic hot water need to be heated to 55°C (131°F)? Wouldn’t 40-45°C (104-113°F) also be sufficient? Because for the legionella prevention program, 55°C (131°F) is actually too low anyway, while 40-45°C (104-113°F) could be managed by the heat pump without using the heating element.
My question is: does the domestic hot water need to be heated to 55°C (131°F)? Wouldn’t 40-45°C (104-113°F) also be sufficient? Because for the legionella prevention program, 55°C (131°F) is actually too low anyway, while 40-45°C (104-113°F) could be managed by the heat pump without using the heating element.
marienschatten schrieb:
Why would the heating element always turn on at the same time at night when no hot water is being used? This can simply be related to the temperature dropping below a set threshold. If you have a fairly consistent daily routine, it’s likely that the temperature (either of the heating system or the hot water tank) falls below that threshold at a similar time each day.
Alternatively, it could be a night setback setting, although the timing would be a bit unusual, it’s not impossible.
Are you sure you’ve checked all possible control settings? Sometimes manufacturers hide these options in a third-level submenu somewhere you wouldn’t intuitively expect.
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