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marienschatten17 Dec 2023 15:55We 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
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RotorMotor17 Dec 2023 16:23marienschatten schrieb:
with a 25 kWh (25 kWh) storage battery. Wow, how did that happen?
marienschatten schrieb:
What I don’t understand about these curves is the electricity demand around 4:00 AM. At that time, we’re asleep and, apart from the heat pump, basically no electricity should be needed. I’m not aware of any timer that switches anything on at that time.
What could that be? Water heating?
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Radfahrer17 Dec 2023 16:51You have a high electricity consumption, so I would also be interested to know where it is being used.
Install a Shelly device on the heat pump so you can monitor its power consumption.
Install a Shelly device on the heat pump so you can monitor its power consumption.
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KarstenausNRW17 Dec 2023 16:54I don’t understand your entire curve. Why are there so many cycles around 5 kW to 7.5 kW? And why so many peaks near 5 kW? Also, why is the total consumption so high?
What kind of house is this? What kind of heat pump? What settings are you using?
I would expect a curve like this – heat pump running from one to eleven, car charging at 2 p.m., and hot water starting at 7 p.m.
What kind of house is this? What kind of heat pump? What settings are you using?
I would expect a curve like this – heat pump running from one to eleven, car charging at 2 p.m., and hot water starting at 7 p.m.
marienschatten schrieb:
We have a groundwater heat pump, an electric heating element for hot water, and a 10kW solar power system with a 25 kWh (27 US quart) battery storage.
Now in winter, the solar system practically produces nothing. The electricity demand is covered by the grid.
The system shows the electricity consumption per day.
What I don’t understand about these graphs is the electricity demand around 4:00 a.m. At that time, we are sleeping and basically no electricity should be needed except for the heat pump. I am not aware of any timer that switches anything on at that time.
What could that be?
Best regards,
Bernd
Then I’ll start with photovoltaic + battery. Hopefully, you are planning to expand the photovoltaic system to at least 30 kWp so that the battery gets enough “feed”? Otherwise, it will just deteriorate, especially in winter.
And hopefully, you were already informed that photovoltaic doesn’t produce “nothing” in winter, but significantly less than in summer. These typical generation curves are well known everywhere.
Do you have continuous hot water circulation? (In my opinion, this is a comfortable waste of energy.)
If so, consider setting the circulation pump to operate only during the times it is actually needed.
Or maybe after the evening shower, the hot water tank is cooled down due to the inflow of cold “mixed” water, so it has to be reheated already by 4 a.m. so you can shower warm in the morning?
And finally: What does the installer say about this?
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Buchsbaum17 Dec 2023 20:54Photovoltaic yields are very low from November to February. Today, I had a yield of 3.5 kWh, which was already quite a lot.
Therefore, you heat your home and hot water electrically most of the time when temperatures are around freezing.
This is expensive, and physics cannot be fooled.
I don’t find a consumption of 50 kWh to be very high. This is the total daily electricity consumption for a house.
The problem is more the electricity price in Germany. It is 10 times higher than in Norway and three times more expensive than in Austria.
However, you need very little electricity from the grid during the other 8 months, so that balances out somewhat. I would be more worried about the electricity price continuing to rise. Grid fees are increasing dramatically, and there are reports that the renewable energy surcharge will be reintroduced.
Increasing demand combined with decreasing supply naturally raises prices.
The only solution is to lower the heating setpoint and shower less. Everything else just costs money.
Therefore, you heat your home and hot water electrically most of the time when temperatures are around freezing.
This is expensive, and physics cannot be fooled.
I don’t find a consumption of 50 kWh to be very high. This is the total daily electricity consumption for a house.
The problem is more the electricity price in Germany. It is 10 times higher than in Norway and three times more expensive than in Austria.
However, you need very little electricity from the grid during the other 8 months, so that balances out somewhat. I would be more worried about the electricity price continuing to rise. Grid fees are increasing dramatically, and there are reports that the renewable energy surcharge will be reintroduced.
Increasing demand combined with decreasing supply naturally raises prices.
The only solution is to lower the heating setpoint and shower less. Everything else just costs money.
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