Good morning, we have some questions. We are building a semi-detached house with a Dimplex Law9 IMR. The conduit for photovoltaic systems has been planned.
Would it be more practical to prepare for solar thermal systems in a semi-detached house instead? We have limited available roof space (two windows are installed on the roof).
We called Dimplex yesterday, but their answer was somewhat vague and seemed to favor photovoltaic systems (I had forgotten to mention the windows and the semi-detached house). Their reasoning was that the heat pump runs efficiently in summer and you mostly need the electricity then, which is generated by photovoltaics. In winter, a photovoltaic system is also more practical because it is more efficient.
What is your opinion?
Would it be more practical to prepare for solar thermal systems in a semi-detached house instead? We have limited available roof space (two windows are installed on the roof).
We called Dimplex yesterday, but their answer was somewhat vague and seemed to favor photovoltaic systems (I had forgotten to mention the windows and the semi-detached house). Their reasoning was that the heat pump runs efficiently in summer and you mostly need the electricity then, which is generated by photovoltaics. In winter, a photovoltaic system is also more practical because it is more efficient.
What is your opinion?
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BauBauNRW23 Dec 2020 20:31Fuchur schrieb:
As of today, we have generated 368 kWh so far in December despite several dull, foggy days and not even having a south-facing roof. I would be interested to know to what extent this covers your monthly electricity costs? How many kWh do you roughly consume in a month?
I’m not sure if you can really offset it like that. You usually use electricity even on sunny winter days. Of course, it can be cold then, but at least the heating is running. Otherwise, you need more electricity when it’s dark and there’s no sunshine, and in those cases, photovoltaic systems generally don’t produce much energy...
bauenmk202023 Dec 2020 20:55Isn't it also true that a heating system with a solar-heated buffer tank is more difficult to control?
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BauBauNRW23 Dec 2020 21:00I am especially concerned about the winter period, for example December as mentioned. I am also considering building with photovoltaic systems and often hear that it is not worth it, but I have never seen exact figures. And of course, I understand that it varies from family to family and house to house...
Currently, we have almost no feed-in (0–1 kWh per day), so we use all the electricity ourselves through the battery.
Our electricity consumption is not very representative at the moment, as we only moved in three months ago and many things are still unsettled, especially the heat pump, which is running on temporary basic settings. December consumption is currently 860 kWh.
To evaluate profitability, you need to consider the whole year. Just the fluctuations caused by the weather make weekly or monthly assessments quite meaningless. In summer, we had weeks with more than 1000 kWh production. Looking into December, the difference between the best and worst daily value (26 versus 4.5) was only one calendar day.
Our electricity consumption is not very representative at the moment, as we only moved in three months ago and many things are still unsettled, especially the heat pump, which is running on temporary basic settings. December consumption is currently 860 kWh.
To evaluate profitability, you need to consider the whole year. Just the fluctuations caused by the weather make weekly or monthly assessments quite meaningless. In summer, we had weeks with more than 1000 kWh production. Looking into December, the difference between the best and worst daily value (26 versus 4.5) was only one calendar day.
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WilderSueden23 Dec 2020 23:12BauBauNRW schrieb:
My concern is specifically about the winter period, for example December.
I’m also considering building with photovoltaic panels, and I often hear that it’s not worth it, but I have never seen exact figures. And I understand that it varies from family to family and house to house... Photovoltaic systems are generally considered to pay off in about 10 years, depending on costs, orientation, and electricity consumption. I think you can’t expect to run the heat pump much on this. Of course, there are sunny cold days, but they are not very common here, and especially in December, the days are quite short with low sun angles. If you have a hill (which is rather rare in NRW) or a neighbor with a large house shading the solar panels, you won’t generate much electricity.
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