Hello everyone,
We recently selected a building plot in a new development area during the allocation appointment in our home municipality near Munich. I won’t even start talking about the problems and frustrations this topic will continue to bring us for years to come—otherwise, I might as well do a dive off the 10-meter (33-foot) platform into an empty pool. So, let’s just leave it at that.
My main concern is the photovoltaic system that is supposed to be installed (with battery storage + heat pump) or on the (semi-detached house). I have to say that the development plan isn’t very well thought out and specifies a shed roof (mono-pitched roof) facing north-north-east for our house and the five other semi-detached houses on the side street. I have seen from various tables that a 12° (12°) roof pitch combined with a north orientation is quite poor for photovoltaic system yield. And if I am already investing a lot of money in such a system to make the heat pump pay off, it really should operate at maximum efficiency.
According to the municipality, which will discuss this in its building committee on Tuesday, it is not yet clear whether they will approve a 180° rotation of the roof orientation (then facing south-south-west). It is also uncertain whether this would be required only for the directly attached neighbor or for all six semi-detached houses in that row, due to the requirement for uniform profiles.
Two questions on this:
1. How do I find providers with a good price-performance ratio for photovoltaic systems (with or without storage? pros and cons)? I think there is hardly any other technical system about which I have less knowledge than photovoltaic systems. I know more about sewing machines and construction machinery, even though I neither sew nor dig deep holes. 😀
2. From a construction point of view, I see two possibilities:
a) Do nothing, which means I would have a photovoltaic roof system facing north. How much output can I expect from 0° flat-hung balcony panels or wall-mounted panels? It probably looks awful and what about the yield?
b) Rotate the roof by 180°, and raise it overall by about 50cm (20 inches), which would automatically exceed the maximum allowed height according to the development plan. The roof pitch would be flattened from 12° (12°) to 7° (7°) (so that rain can still provide self-cleaning) to prevent the sloping side from extending too far over the south-facing balcony below. The balcony forms the bay window for the first floor and ground floor.
I would like possible providers to calculate both scenarios, but how do I find reasonable, reliable, and capable photovoltaic system providers? Many thanks.
We recently selected a building plot in a new development area during the allocation appointment in our home municipality near Munich. I won’t even start talking about the problems and frustrations this topic will continue to bring us for years to come—otherwise, I might as well do a dive off the 10-meter (33-foot) platform into an empty pool. So, let’s just leave it at that.
My main concern is the photovoltaic system that is supposed to be installed (with battery storage + heat pump) or on the (semi-detached house). I have to say that the development plan isn’t very well thought out and specifies a shed roof (mono-pitched roof) facing north-north-east for our house and the five other semi-detached houses on the side street. I have seen from various tables that a 12° (12°) roof pitch combined with a north orientation is quite poor for photovoltaic system yield. And if I am already investing a lot of money in such a system to make the heat pump pay off, it really should operate at maximum efficiency.
According to the municipality, which will discuss this in its building committee on Tuesday, it is not yet clear whether they will approve a 180° rotation of the roof orientation (then facing south-south-west). It is also uncertain whether this would be required only for the directly attached neighbor or for all six semi-detached houses in that row, due to the requirement for uniform profiles.
Two questions on this:
1. How do I find providers with a good price-performance ratio for photovoltaic systems (with or without storage? pros and cons)? I think there is hardly any other technical system about which I have less knowledge than photovoltaic systems. I know more about sewing machines and construction machinery, even though I neither sew nor dig deep holes. 😀
2. From a construction point of view, I see two possibilities:
a) Do nothing, which means I would have a photovoltaic roof system facing north. How much output can I expect from 0° flat-hung balcony panels or wall-mounted panels? It probably looks awful and what about the yield?
b) Rotate the roof by 180°, and raise it overall by about 50cm (20 inches), which would automatically exceed the maximum allowed height according to the development plan. The roof pitch would be flattened from 12° (12°) to 7° (7°) (so that rain can still provide self-cleaning) to prevent the sloping side from extending too far over the south-facing balcony below. The balcony forms the bay window for the first floor and ground floor.
I would like possible providers to calculate both scenarios, but how do I find reasonable, reliable, and capable photovoltaic system providers? Many thanks.
Hitokiri-1978 schrieb:
My boss is also considering the combination of photovoltaic panels plus battery/storage plus heat pump and said it makes sense if, for example, you’re not at home during the day but can use the stored electricity at night. Why wouldn’t that be worthwhile?Because the price of a battery currently likely doesn’t pay off compared to the cost savings it can provide. And since I remember that money doesn’t grow on trees for you, and you’re building in a high-cost area, I would have left out the storage.
mayglow schrieb:
Ah, there was our misunderstanding. I thought you wanted to tilt in the roof direction (meaning mounting elevated towards NNE), which wouldn’t have made any sense. I wasn’t aware that tilting opposite to the roof orientation is possible. Doesn’t that sometimes cause shading on your own modules? I never considered mounting elevated towards NNE, that really wouldn’t have made any sense 😉
Mounting opposite to the roof pitch is possible and is done, but of course you need spacing between the module rows. At 12° (about 21 inches) that’s probably acceptable. However, my photovoltaic software trial period has expired, so I can’t simulate it anymore 🙁
W
WilderSueden4 Jul 2022 18:38Have you managed to find any additional funding anywhere? If I remember the financing thread correctly, you really need to save every penny. A large photovoltaic system or even a battery storage unit were certainly not included in the original budget back then, and since then both construction costs and interest rates have increased significantly.
Ysop*** schrieb:
Because the price of a battery currently does not seem to pay off compared to the cost savings it provides. And since I remember that money doesn’t grow on trees for you, plus you are building in a high-cost area, I would have left out the storage. From an ecological standpoint, it also doesn’t make sense, as the photovoltaic electricity that is not self-consumed is converted with losses. Overall, less fossil energy would be needed if there were no home batteries. Additionally, the production of batteries itself is not environmentally friendly.
W
WilderSueden5 Jul 2022 10:25No problem, I found it using the search function:
https://www.hausbau-forum.de/threads/abwaegung-erbbaurecht-vs-grundstueckskauf-renovieren.38175/
https://www.hausbau-forum.de/threads/hier-bleiben-und-bauen-oder-wegziehhen-und-dort-bauen-kaufen.42954/
If the figures are still the same, we basically have no equity and a net income of €4400 (about 4700 USD), with a target monthly payment of €1700 (about 1800 USD). What this means for an area near Munich, considering current interest rates, anyone can calculate for themselves.
https://www.hausbau-forum.de/threads/abwaegung-erbbaurecht-vs-grundstueckskauf-renovieren.38175/
https://www.hausbau-forum.de/threads/hier-bleiben-und-bauen-oder-wegziehhen-und-dort-bauen-kaufen.42954/
If the figures are still the same, we basically have no equity and a net income of €4400 (about 4700 USD), with a target monthly payment of €1700 (about 1800 USD). What this means for an area near Munich, considering current interest rates, anyone can calculate for themselves.
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