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.
W
WilderSueden5 Jul 2022 10:39It wasn't about enjoyment; someone had apparently been searching through the old threads. But the post is gone now.
Knüllwald schrieb:
A realistic chance to implement a photovoltaic system now only exists if you organize the components yourself.
The roofer can install the modules directly. Use conduits for the technical cables for the photovoltaic wiring. Buy the inverter and get a suitable battery storage system.
I would buy the materials myself and then have it installed. Sooner or later, photovoltaic companies run out of materials or become so expensive that they beg for every order. Prices are relatively current, and the products can still be obtained promptly.
Since the system must be accepted by an electrician approved by the grid operator, who also handles all the paperwork, you can imagine how difficult it is to find someone who will take on your preparatory work without making a profit on the components. Due to the solar installation mandate and component supply issues, you should be glad to find anyone who will install the entire system.
Grundaus schrieb:
Since the system must be approved by an electrician authorized by the grid operator, who also handles all the paperwork, you can imagine how difficult it is to find one who will take over your preliminary work without making a profit on the components. Due to the solar mandate and supply shortages of components, you should be glad to find anyone who will install the entire system. The electrician only needs to approve the AC installation at the main connection point, so you must have the inverter and meter installed by them as well.
It is definitely better to first find an electrician and clarify with them what they expect to inspect. This will help you significantly during the planning phase. They will provide a number of essential requirements and rules that must be followed. The electrician will also tell you what documentation you need and how large your main electrical panel should be. For new buildings, it is best to involve the construction electrician from the start and ask them in advance.
K
Knüllwald6 Jul 2022 13:26There are other options for photovoltaic systems as well. It doesn’t have to be on the house roof.
You can also have a module frame built and then install about 20 panels somewhere at the edge of your property.
This has the advantage that you can perfectly orient the panels. You can easily fit 9 panels on one module frame. Two frames and you have your photovoltaic system running at optimal capacity.
It’s nice if the electrician wants to earn something, but then they also have to deliver. And currently, they simply cannot. Neither binding delivery dates nor fixed prices are available. I contacted 4 companies— all very expensive and none could deliver quickly.
Luckily, I bought everything myself quickly. Now, prices are without exception 50 percent or more higher, and many items are no longer available. If someone can deliver immediately, it costs more than twice as much. The Huawei backup box for the photovoltaic system’s emergency power used to cost 600 euros. Today it costs 1400 euros with a 3-month delivery time. One supplier can deliver immediately but charges 2200 euros.
The same situation applies to inverters. I paid 1250 euros. Now, with immediate availability, they cost 2400 euros. Modules have risen from 140 to over 200 euros. Although some are still available.
I don’t believe it will get any better. More likely, it will become much, much worse. Soon there will be plenty of electricians who, due to material shortages, will gladly install self-built systems.
In South Africa, electricity is being turned off for hours due to high gas and coal prices. They are buying photovoltaic systems like crazy right now.
And this seems to be the case worldwide. Since everything here also comes from China, the German homebuilder is at the very back of the line.
You can also have a module frame built and then install about 20 panels somewhere at the edge of your property.
This has the advantage that you can perfectly orient the panels. You can easily fit 9 panels on one module frame. Two frames and you have your photovoltaic system running at optimal capacity.
It’s nice if the electrician wants to earn something, but then they also have to deliver. And currently, they simply cannot. Neither binding delivery dates nor fixed prices are available. I contacted 4 companies— all very expensive and none could deliver quickly.
Luckily, I bought everything myself quickly. Now, prices are without exception 50 percent or more higher, and many items are no longer available. If someone can deliver immediately, it costs more than twice as much. The Huawei backup box for the photovoltaic system’s emergency power used to cost 600 euros. Today it costs 1400 euros with a 3-month delivery time. One supplier can deliver immediately but charges 2200 euros.
The same situation applies to inverters. I paid 1250 euros. Now, with immediate availability, they cost 2400 euros. Modules have risen from 140 to over 200 euros. Although some are still available.
I don’t believe it will get any better. More likely, it will become much, much worse. Soon there will be plenty of electricians who, due to material shortages, will gladly install self-built systems.
In South Africa, electricity is being turned off for hours due to high gas and coal prices. They are buying photovoltaic systems like crazy right now.
And this seems to be the case worldwide. Since everything here also comes from China, the German homebuilder is at the very back of the line.
W
WilderSueden6 Jul 2022 14:02Knüllwald schrieb:
There are other options for photovoltaic systems as well. They don’t have to be installed on the house roof.
You can also have a mounting frame built and then install about 20 panels somewhere at the edge of your property.
The advantage is that you can orient the panels optimally. One mounting frame can easily hold 9 panels. Two of these and you have your photovoltaic system operating at peak performance. Of course, on the roof you usually have much less shading than at ground level. Trees, neighboring houses, etc. have less impact at a height of 6 meters (20 feet). This is especially true during the winter months when the sun is lower in the sky.
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