Hi,
last month we put a photovoltaic system without storage into operation.
Currently, we are not receiving any compensation because a bi-directional meter has not yet been installed. The current meter has a reverse current lock, so we are effectively giving away all excess electricity.
For the first 2-3 years after moving in, I had our heat pump set up to operate without an outdoor reset control and only respond to the outside temperature. Differences between day and night operation were not configured. This has been running more or less unchanged for about 7-8 years.
To avoid giving away electricity right now, I’ve been adjusting the heat pump settings over the past two weeks — shifting domestic hot water production more towards daytime and, through parallel shift, raising the heating curve during the day and lowering it at night. This initially caused it to become noticeably too warm in the evenings last week, in combination with the sun. So I lowered the curve during the day again. This morning it was a bit too cold. Nothing serious, but not as consistent as before.
How do you handle this?
last month we put a photovoltaic system without storage into operation.
Currently, we are not receiving any compensation because a bi-directional meter has not yet been installed. The current meter has a reverse current lock, so we are effectively giving away all excess electricity.
For the first 2-3 years after moving in, I had our heat pump set up to operate without an outdoor reset control and only respond to the outside temperature. Differences between day and night operation were not configured. This has been running more or less unchanged for about 7-8 years.
To avoid giving away electricity right now, I’ve been adjusting the heat pump settings over the past two weeks — shifting domestic hot water production more towards daytime and, through parallel shift, raising the heating curve during the day and lowering it at night. This initially caused it to become noticeably too warm in the evenings last week, in combination with the sun. So I lowered the curve during the day again. This morning it was a bit too cold. Nothing serious, but not as consistent as before.
How do you handle this?
We have a heat pump and photovoltaic system with storage.
We try to shift consumption to different times of the day.
Night setback by 3 degrees,
hot water overheated to 60°C (140°F) at 4 p.m.,
otherwise automatic operation.
Our house only loses about 1 degree overnight.
Whether I supply, for example, 10 kWh heating power during the day or at night makes no difference.
The underfloor heating is simply too slow for that.
We try to shift consumption to different times of the day.
Night setback by 3 degrees,
hot water overheated to 60°C (140°F) at 4 p.m.,
otherwise automatic operation.
Our house only loses about 1 degree overnight.
Whether I supply, for example, 10 kWh heating power during the day or at night makes no difference.
The underfloor heating is simply too slow for that.
H
hausbauen10116 Mar 2025 18:57@Nida35a What type of insulation does your house have that it only loses 1 degree overnight?
W
wiltshire16 Mar 2025 19:23nordanney schrieb:
Why buy an additional heating element (which then directly uses how many kW)?When raising the temperature in the hot water storage tank from, for example, 50 to 60 degrees Celsius (122 to 140°F), the heat pump no longer offers significant advantages. The heating element prevents additional switching cycles of the heat pump. It's not a bad idea.hausbauen101 schrieb:
What kind of insulation does your house have that it only loses 1 degree overnight?Better than KfW 40 standard, but this applies only down to 0 degrees Celsius (32°F).
At temperatures between -10 and -20 degrees Celsius (14°F to -4°F), the heat pump runs continuously, using 0.7 to 1.5 kWh of electricity, which easily drains the battery.
For example, last night with 0 degrees Celsius (32°F) and while we are on vacation.
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