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.
mayglow schrieb:
Mounting frames are usually installed on the south to southwest/southeast sides. On the north side, it’s better to keep it more flat, if the roof orientation remains that way. (I mean to allow more sunlight exposure from the east and west). A quick search also provides relevant statistics.I don’t quite understand that right now. But PVGIS would clarify this. Currently, I can’t access it on my mobile phone...K
Knüllwald4 Jul 2022 17:58A realistic chance to install a photovoltaic system now only exists if you organize the components yourself.
The roofer can install the panels directly during the roofing work. Run conduit for the technology cables needed for the photovoltaic wiring. Purchase the inverter and obtain a suitable battery storage system.
Add a smart meter, and you have everything assembled. Perhaps a professional can help with the calculations.
Companies are either completely overwhelmed, out of materials, or simply unwilling. There are just too few companies, staff, and materials to meet the current demand. Of course, we are not discussing prices here.
For example, I have the following configuration:
18 x Trina Vertex 400Wp (210€/each)
Huawei WR Sun 6 KTL M1 (1800€)
Huawei Luna Storage 10 kW (6000€)
Huawei Smartmeter DTS 666 (250€)
Schletter Profile 8 x 6m (500€)
Miscellaneous small parts (500€)
Photovoltaic system capacity 7.2 kWp
I would buy the materials myself and then hire someone to do the installation. Sooner or later, photovoltaic companies will run out of materials or become so expensive that they have to beg for every contract. The prices are relatively current, and the components are still available on short notice.
Fronius BYD storage systems are impossible to obtain. BYD will not deliver any more this year, and the price per storage unit is expected to increase by 3000 euros next year.
The roofer can install the panels directly during the roofing work. Run conduit for the technology cables needed for the photovoltaic wiring. Purchase the inverter and obtain a suitable battery storage system.
Add a smart meter, and you have everything assembled. Perhaps a professional can help with the calculations.
Companies are either completely overwhelmed, out of materials, or simply unwilling. There are just too few companies, staff, and materials to meet the current demand. Of course, we are not discussing prices here.
For example, I have the following configuration:
18 x Trina Vertex 400Wp (210€/each)
Huawei WR Sun 6 KTL M1 (1800€)
Huawei Luna Storage 10 kW (6000€)
Huawei Smartmeter DTS 666 (250€)
Schletter Profile 8 x 6m (500€)
Miscellaneous small parts (500€)
Photovoltaic system capacity 7.2 kWp
I would buy the materials myself and then hire someone to do the installation. Sooner or later, photovoltaic companies will run out of materials or become so expensive that they have to beg for every contract. The prices are relatively current, and the components are still available on short notice.
Fronius BYD storage systems are impossible to obtain. BYD will not deliver any more this year, and the price per storage unit is expected to increase by 3000 euros next year.
H
Hitokiri-19784 Jul 2022 18:00i_b_n_a_n schrieb:
Discard outrageous counteroffers (95% at the moment?). What is a counteroffer?? :/ I inquire, and they send me a deliberately overpriced offer so I won’t bother them as a potential customer?? Then they might as well not reply at all, because I have an elephant’s memory and I definitely know who I will never sign with. 🙁
Ysop*** schrieb:
Is a storage system mandatory for you? Otherwise, I would reconsider. We will have one, but economically it’s an expensive affair ;-). My boss also opted for the combination of photovoltaic + battery/storage + heat pump and said it makes sense if you’re not home during the day, so you can use the charged electricity at night. Why wouldn’t that be worthwhile?
Scout** schrieb:
You can order a conduit from the roof to the utility room from the electrician and ask if they would also install the inverter and connect the system. Otherwise, check with a solar installer to see if they handle this part in the utility room. I’m completely lost... 🙁 If my knowledge about houses is at 100, then about photovoltaic systems it’s barely 5… Until recently, it just wasn’t necessary to deal with this topic. And the house-building project is far from certain yet. There are probably two million things that can go wrong in this gamble 😉
Scout** schrieb:
There are also forums on the topic of photovoltaics (which can’t be named here) that will gladly help you with planning and choosing modules. I’ll get back to that by private message. I’ve already received a warning for a “satanic link.” Sorry... I’m active in so many other forums on all sorts of topics and nobody there cares about a link. I don’t understand why the moderators here react so aggressively? Different countries—uh, forums—different customs. What’s the Sharia to one is the link ban to another 😀
So, according to the development plan, we are not required to install a photovoltaic system, but since the government is increasingly pushing, and possibly mandating, photovoltaics and heat pumps, it probably makes sense to include them in the build now. Later on, we probably won’t do it once the loan is fully used.
The idea of buying components individually sounds interesting, but we are complete novices! We do want to do floors and such ourselves, but compared to that, this is rocket science and I wouldn’t trust myself easily with it.
There is no general contractor; every plot owner—as opposed to owner (those are not the same)—manages their own build.
Thanks for the responses!
If I have used PVGIS correctly, here are the results:
The remaining questions are: Is a mounting structure allowed, visually acceptable or tolerated, and then also whether it is cost-effective?
North-northeast
A 30° mounting tilt should result in an 18° "tilted" angle facing south-southwest
The remaining questions are: Is a mounting structure allowed, visually acceptable or tolerated, and then also whether it is cost-effective?
North-northeast
| Slope angle [°]: | 12 |
| Azimuth angle [°]: | -135 |
| Annual photovoltaic energy production [kWh]: | 8497.74 |
A 30° mounting tilt should result in an 18° "tilted" angle facing south-southwest
| Slope angle [°]: | 18 |
| Azimuth angle [°]: | 45 |
| Annual photovoltaic energy production [kWh]: | 10281.84 |
Yes, these are defensive offers. I would estimate that given the current situation, some of them will be sent out... and even accepted 😱 out of desperation.
Just for your information: You cannot send or receive private messages yet, only after reaching 250 posts. However, these messages cannot mention other forums or share links.
Batteries (I do have one, partially sponsored through KfW40+) usually don’t pay off because they are too expensive. My prediction regarding electricity prices is that the cost per kWh for a battery would need to be around €600 net for it to be worthwhile.
Just for your information: You cannot send or receive private messages yet, only after reaching 250 posts. However, these messages cannot mention other forums or share links.
Batteries (I do have one, partially sponsored through KfW40+) usually don’t pay off because they are too expensive. My prediction regarding electricity prices is that the cost per kWh for a battery would need to be around €600 net for it to be worthwhile.
i_b_n_a_n schrieb:
"tilted" toward south-southwestAh, there was our misunderstanding. I thought you wanted to tilt in the roof direction (that is, propping it up toward NNE), which wouldn’t have made sense. I wasn’t aware that you could tilt against the roof orientation. Wouldn’t that potentially cast shadows on your own panels?Similar topics