Good morning,
Yesterday, we received a quote for a photovoltaic system. Our construction of the single-family house will start in October 2023 and is expected to be ready for occupancy in September 2024.
We have an annual electricity consumption of about 3000 kWh for our household, plus an unknown amount for the air-to-water heat pump (Weishaupt Biblock).
Our roof is oriented exactly south with a 25° pitch (gable roof). According to the calculation in the quote, the entire south roof is fully covered with modules (20 units), and the north roof is also equipped with 5 modules.
Attached you will find the details of the quote. The price is €20,900 net with battery storage and €15,900 net without storage.
What do you think of the offer? From what I understand in the discussions here on the forum, it is advisable to skip the battery storage. That would bring the cost to just under €16,000, which is a bit over €1,600 per kWp. That seems relatively expensive, doesn’t it?
Thank you very much in advance for your help.
Best regards,
Elias
Yesterday, we received a quote for a photovoltaic system. Our construction of the single-family house will start in October 2023 and is expected to be ready for occupancy in September 2024.
We have an annual electricity consumption of about 3000 kWh for our household, plus an unknown amount for the air-to-water heat pump (Weishaupt Biblock).
Our roof is oriented exactly south with a 25° pitch (gable roof). According to the calculation in the quote, the entire south roof is fully covered with modules (20 units), and the north roof is also equipped with 5 modules.
Attached you will find the details of the quote. The price is €20,900 net with battery storage and €15,900 net without storage.
What do you think of the offer? From what I understand in the discussions here on the forum, it is advisable to skip the battery storage. That would bring the cost to just under €16,000, which is a bit over €1,600 per kWp. That seems relatively expensive, doesn’t it?
Thank you very much in advance for your help.
Best regards,
Elias
D
Deliverer25 Jun 2022 08:55If it stays at 27 modules, I would wire them in a cross pattern. 14 south-facing + 14 north-facing in parallel to one input. Then do the same again with 13. However, there should be no moving shadows (such as from a chimney) on either side. Normal shading early in the morning or in the evening is not a problem.
More (and probably better) tips can be found elsewhere, which I am not allowed to mention here.
More (and probably better) tips can be found elsewhere, which I am not allowed to mention here.
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Elias_dee25 Jun 2022 09:03Deliverer schrieb:
If it stays at 27 modules, I would wire them in a crossed string configuration. 14 S + 14 N in parallel to one input. Then the same again with 13.
However, there should be no moving shade (such as from a chimney or similar) on either side. Normal shading early in the morning or in the evening is not a problem.
More (and probably better) advice is available elsewhere, which I’m not allowed to mention here. Okay, good idea with the crossed string wiring. Ideally, there shouldn’t be any shading at all. So from our roof, there won’t be any shading because there is no chimney. The only question is how much shadow the house above us casts, especially in winter (we are on a slope). I can’t really assess that right now because it’s a new development and our house isn’t built yet...
D
Deliverer25 Jun 2022 16:49The shadow from another house is then so extensive that the type of stringing hardly matters. However, chimneys, bay windows, dormers, and similar features should be avoided with poly-strings, as partial shading can also affect the opposite side.
Question to the group:
I plan to install a photovoltaic system on the flat roof of the garage in the future. At the moment, we are doing paving work in the front yard.
I would like to prepare conduit(s) in advance. How many and what type of cables run from the photovoltaic system to the equipment room?
Does the number of cables differ depending on whether a battery storage system is included or not? Also, does it make a difference if, in addition to the garage flat roof, the main roof of the house is used for photovoltaic as well?
Thanks in advance!!!
I plan to install a photovoltaic system on the flat roof of the garage in the future. At the moment, we are doing paving work in the front yard.
I would like to prepare conduit(s) in advance. How many and what type of cables run from the photovoltaic system to the equipment room?
Does the number of cables differ depending on whether a battery storage system is included or not? Also, does it make a difference if, in addition to the garage flat roof, the main roof of the house is used for photovoltaic as well?
Thanks in advance!!!
R
RotorMotor27 Jun 2022 10:23Once again, this is quite off-topic, but a photovoltaic string usually requires two 6mm² (10 AWG) photovoltaic cables and one grounding conductor.
It is best not only to install empty conduits but also to pull the cables through them right away. Depending on the diameter, bend radius, and number of corners, it can sometimes be difficult, and it would be a shame if it didn’t work out. If the cable installation isn’t ideal, you can still use the cables as pull wires if necessary 🙂
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