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
Scout** schrieb:
You mean yield? Let me guess: north-facing roof, northern Germany. Then yes.Even with east/west orientation here, pvgis (5% system loss) only gives me 830 kWh/kWp.
But in my case, it will probably be a bit lower since I have shading during the first 3 hours of the day.
So the answer is: it depends.
Scout** schrieb:
You mean yield? Let me guess: north-facing roof, northern Germany. Then yes Yes, exactly, yield.
Western Germany, NRW 46562, 8 kWp southeast, almost south, 4.2 kWp northwest, almost north.
Here are the data again from PVGIS, I hope everything is correct.
Southeast side with 8 kWp
Horizon: Calculated
Database used: PVGIS-SARAH2
Photovoltaic technology: Crystalline silicon
Photovoltaic installed [kWp]: 8
System loss [%]: 14
Simulation outputs:
Slope angle [°]: 45
Azimuth angle [°]: -43
Yearly photovoltaic energy production [kWh]: 7868.2
Yearly in-plane irradiation [kWh/m²]: 1227.95
Year-to-year variability [kWh]: 415.67
Changes in output due to:
Angle of incidence [%]: -3
Spectral effects [%]: 1.8
Temperature and low irradiance [%]: -5.68
Total loss [%]: -19.91
Photovoltaic electricity cost [per kWh]: 0.158
Northwest side with 4.2 kWp
Horizon: Calculated
Database used: PVGIS-SARAH2
Photovoltaic technology: Crystalline silicon
Photovoltaic installed [kWp]: 4.2
System loss [%]: 14
Simulation outputs:
Slope angle [°]: 45
Azimuth angle [°]: 137
Yearly photovoltaic energy production [kWh]: 2339.44
Yearly in-plane irradiation [kWh/m²]: 734.48
Year-to-year variability [kWh]: 59.11
Changes in output due to:
Angle of incidence [%]: -5.36
Spectral effects [%]: 1.55
Temperature and low irradiance [%]: -8.25
Total loss [%]: -24.16
Photovoltaic electricity cost [per kWh]: 0.533
D
Deliverer31 May 2022 21:28Smart meters yes – it’s simply enjoyable to see how the system is performing. It also helps with optimization if you want to.
Otherwise: regular taxation!
And 800 kW/kWp is acceptable. That is the German standard for east/west systems. You should aim to build up to 600, while a south-facing roof usually reaches around 1000.
Otherwise: regular taxation!
And 800 kW/kWp is acceptable. That is the German standard for east/west systems. You should aim to build up to 600, while a south-facing roof usually reaches around 1000.
Deliverer schrieb:
Smart meter yes – it’s just fun to see what the system is doing. It also helps with optimization if you’re interested in that.I have a digital electricity meter, which I already read via the IR interface and analyze with ioBroker. It’s a two-way meter, so I can also see the current consumption. I’ll probably skip the smart meter for now.
E
Elias_dee6 Jun 2022 13:00Hello everyone,
I’m the original poster of this thread and wanted to share an update. I received a second offer from a solar installer recommended by one of my future neighbors.
Here’s what was offered: €12,500 net for an 11 kWp system. This would fully cover the south-facing roof (25° pitch).
The components include:
27 x JinkoSolar Tiger NE HC N-Type black solar modules JKM410N-54HL4-B
1 x SMA inverter STP10.0-3SE-40
1 x SMA Sunny Home Manager HM-20
Optionally, a BYD B-Box Premium HVS 7.7 kWh (net price €5,900) is available.
I spoke with him again today, and he also now offers the option to install modules on the north-facing roof.
What I’ve learned here: battery storage isn’t really worth it, and definitely fully use the north roof at 25° pitch :-D
Is that still the case? The price for the battery seems relatively good. The price for the system itself is, of course, very attractive.
Financially, it’s unfortunately not an option for us to fully cover both north and south roofs and add battery storage. So the consideration is either 11 kWp on the south roof plus battery, and possibly 3–4 kWp on the north, or fully use both roofs and skip the battery (with the option to add it later).
Fully covering both roofs would also have the advantage that we could avoid installing tile roofing and instead go with a metal roof. I still need to check with the general contractor about any price reduction for this.
What do you think? Any ideas or tips?
Thanks in advance!
I’m the original poster of this thread and wanted to share an update. I received a second offer from a solar installer recommended by one of my future neighbors.
Here’s what was offered: €12,500 net for an 11 kWp system. This would fully cover the south-facing roof (25° pitch).
The components include:
27 x JinkoSolar Tiger NE HC N-Type black solar modules JKM410N-54HL4-B
1 x SMA inverter STP10.0-3SE-40
1 x SMA Sunny Home Manager HM-20
Optionally, a BYD B-Box Premium HVS 7.7 kWh (net price €5,900) is available.
I spoke with him again today, and he also now offers the option to install modules on the north-facing roof.
What I’ve learned here: battery storage isn’t really worth it, and definitely fully use the north roof at 25° pitch :-D
Is that still the case? The price for the battery seems relatively good. The price for the system itself is, of course, very attractive.
Financially, it’s unfortunately not an option for us to fully cover both north and south roofs and add battery storage. So the consideration is either 11 kWp on the south roof plus battery, and possibly 3–4 kWp on the north, or fully use both roofs and skip the battery (with the option to add it later).
Fully covering both roofs would also have the advantage that we could avoid installing tile roofing and instead go with a metal roof. I still need to check with the general contractor about any price reduction for this.
What do you think? Any ideas or tips?
Thanks in advance!
In my opinion, this is a straightforward decision. Fully cover both north and south roofs (also because of the 70%). The SMA inverter should be a hybrid inverter, so the BYD battery can be retrofitted later.
Personally, I would go further and borrow money to install the battery right away. I now believe it pays off. Price is fair. Wallbox?
Personally, I would go further and borrow money to install the battery right away. I now believe it pays off. Price is fair. Wallbox?
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