ᐅ New Construction with a Separate Apartment: Solar Power – Electricity – Heating
Created on: 15 Jul 2024 22:21
T
Tobi_SL
Hello,
I know some of my questions have been touched on in other threads but were never answered in detail. So here is my specific situation:
My wife and I want to build a single-family house on a slab foundation with an additional granny flat on the ground floor for my mother-in-law. We already have a plot of land (750 sqm (8,073 sq ft)).
Of course, we want a photovoltaic system on the gable roof with as many kWp on the south side as possible. I have read here that the system can only be connected to one electrical circuit. The granny flat would therefore be permanently connected to the external grid. That much is clear.
My main question concerns the heating system (air-to-water heat pump): Can the heat pump and the rest of the heating be powered entirely from the electricity of the main apartment (with photovoltaic)? Or does that also have to be split somehow?
We would, of course, like to use as much photovoltaic electricity as possible. If we were to rent the granny flat externally at some point, we would simply arrange a flat-rate rent including heating costs. Would that comply with legal requirements? Or does the electricity for heating costs also have to be accounted for separately?
One more thing in conclusion: I have noticed that prefab house providers often charge significant premiums for photovoltaic systems compared to the open market, and you often cannot choose components freely. On the other hand, it is said that a system planned directly by the builder along with the house is better integrated into the overall project. Would you still recommend contracting the photovoltaic system externally? What should be considered during house planning in this case to ensure the installation and integration go as smoothly as possible?
Thanks in advance!
I know some of my questions have been touched on in other threads but were never answered in detail. So here is my specific situation:
My wife and I want to build a single-family house on a slab foundation with an additional granny flat on the ground floor for my mother-in-law. We already have a plot of land (750 sqm (8,073 sq ft)).
Of course, we want a photovoltaic system on the gable roof with as many kWp on the south side as possible. I have read here that the system can only be connected to one electrical circuit. The granny flat would therefore be permanently connected to the external grid. That much is clear.
My main question concerns the heating system (air-to-water heat pump): Can the heat pump and the rest of the heating be powered entirely from the electricity of the main apartment (with photovoltaic)? Or does that also have to be split somehow?
We would, of course, like to use as much photovoltaic electricity as possible. If we were to rent the granny flat externally at some point, we would simply arrange a flat-rate rent including heating costs. Would that comply with legal requirements? Or does the electricity for heating costs also have to be accounted for separately?
One more thing in conclusion: I have noticed that prefab house providers often charge significant premiums for photovoltaic systems compared to the open market, and you often cannot choose components freely. On the other hand, it is said that a system planned directly by the builder along with the house is better integrated into the overall project. Would you still recommend contracting the photovoltaic system externally? What should be considered during house planning in this case to ensure the installation and integration go as smoothly as possible?
Thanks in advance!
H
hanghaus202317 Jul 2024 09:16No problem for me, they are parents.
hanghaus2023 schrieb:
I have always allocated costs based on square meters of living area. That’s how my tax software requires it. It has never caused any problems. And what electricity costs do you use for heating if you don’t pay anything for electricity? Or if you have paid once up front through the investment in solar panels? Obviously, it’s simpler with oil, gas, or district heating.
H
hanghaus202317 Jul 2024 10:27Grundaus schrieb:
And what electricity costs do you assume for heating when you don’t pay for electricity? Or if you have paid once for the investment in solar panels. Clearly, with oil, gas, or district heating it’s straightforward.I should give that some thought. Thanks for the reminder. I don’t have a separate electricity meter for the granny flat.Thank you very much for the many useful tips. There were a lot of things I hadn’t considered. As mentioned, my mother-in-law is still living in the granny flat for now. That shouldn’t cause much stress. Later on, the rental agreement conditions will need to be agreed upon with the tenant before signing the contract.
I believe that heating costs with photovoltaic panels and a heat pump will be lower than those of typical rental properties with gas heating, no matter how roughly you estimate it. We don’t intend to make a profit from the heating costs either. And since it’s a small granny flat, we’re not talking about huge amounts anyway. If the final billing isn’t exactly to the last cent, the tenant probably won’t mind. You just have to make sure you comply with the applicable laws and don’t have any issues with the tax authorities.
I believe that heating costs with photovoltaic panels and a heat pump will be lower than those of typical rental properties with gas heating, no matter how roughly you estimate it. We don’t intend to make a profit from the heating costs either. And since it’s a small granny flat, we’re not talking about huge amounts anyway. If the final billing isn’t exactly to the last cent, the tenant probably won’t mind. You just have to make sure you comply with the applicable laws and don’t have any issues with the tax authorities.
H
hanghaus202318 Jul 2024 08:47I have an electricity meter at the heat pump. I can then allocate the electricity consumption based on the square meters. That should be sufficient for the tax office. I will do it that way next year.
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