ᐅ Heat pump/ventilation system with excessive energy consumption
Created on: 24 Jun 2025 07:44
G
Gintonik
Hello forum,
My brother-in-law sent me a screenshot from his photovoltaic app. The values shown there seem illogical and much too high to me. As far as I can interpret, his photovoltaic system generated 38 kWh and additionally drew 12 kWh from the grid. That adds up to 50 kWh for the day. He has a KfW40 house built in 2022, with a Tecalor THZ 504 heat pump/ventilation system. He also uses this system to cool his house.
The total seems far too high to me, but I have no personal experience with a heat pump/ventilation system. I have now asked him to document the electricity consumption on the meter every evening to see if he really consumes what the app shows. I once had my energy flow meter for my photovoltaic system connected incorrectly, so it showed my generated energy as consumption.
In recent days, we had warm/hot weather. During the day, when the cooling runs, the photovoltaic system supplies electricity. In the evening, when the sun is gone, there is no more power from the photovoltaic system, but then cooling should no longer be necessary.
Do you have any experience with such systems?
My brother-in-law sent me a screenshot from his photovoltaic app. The values shown there seem illogical and much too high to me. As far as I can interpret, his photovoltaic system generated 38 kWh and additionally drew 12 kWh from the grid. That adds up to 50 kWh for the day. He has a KfW40 house built in 2022, with a Tecalor THZ 504 heat pump/ventilation system. He also uses this system to cool his house.
The total seems far too high to me, but I have no personal experience with a heat pump/ventilation system. I have now asked him to document the electricity consumption on the meter every evening to see if he really consumes what the app shows. I once had my energy flow meter for my photovoltaic system connected incorrectly, so it showed my generated energy as consumption.
In recent days, we had warm/hot weather. During the day, when the cooling runs, the photovoltaic system supplies electricity. In the evening, when the sun is gone, there is no more power from the photovoltaic system, but then cooling should no longer be necessary.
Do you have any experience with such systems?
N
nordanney26 Jun 2025 13:50Gintonik schrieb:
I’m currently on a business trip and will actually be able to test that only over the weekend.Gintonik schrieb:
my brother-in-lawDo you have to help your brother-in-law with eating or going to the bathroom as well? Or is "brother-in-law" just a synonym for "I’m only asking for a friend"? 😉nordanney schrieb:
Do you also have to help your brother-in-law with eating or using the bathroom? Or is “brother-in-law” just a code for “I’m asking for a friend”? 😉My brother-in-law somehow has two left hands and a technical understanding below zero. I myself have a good handle on my “older home” and have largely brought it up to current standards.