Hello everyone,
I would like to ask the experts for an assessment of our offer (A1, A2, A3) – as far as it is technically and financially feasible.
We want to fully cover the south side of the roof (total 6.4 kWp (kilowatt peak)) without storage. Since we will also be getting a heat pump (SG ready), we want to supply it with photovoltaic power.
The system can be installed directly at the beginning of September, right after the roofer’s work is finished. It will be handled and carried out by an acquaintance who is always available to support us with advice and assistance. We are newcomers in this field ourselves.
With a total net cost of 10,000 €, I calculate an average of €1,562.50 per kWp.
Title 02 in the summary refers to the Home Manager, not to the energy storage (which I had removed from the offer, as it was originally included).
I look forward to your feedback.
Best regards,
Christian
I would like to ask the experts for an assessment of our offer (A1, A2, A3) – as far as it is technically and financially feasible.
We want to fully cover the south side of the roof (total 6.4 kWp (kilowatt peak)) without storage. Since we will also be getting a heat pump (SG ready), we want to supply it with photovoltaic power.
The system can be installed directly at the beginning of September, right after the roofer’s work is finished. It will be handled and carried out by an acquaintance who is always available to support us with advice and assistance. We are newcomers in this field ourselves.
With a total net cost of 10,000 €, I calculate an average of €1,562.50 per kWp.
Title 02 in the summary refers to the Home Manager, not to the energy storage (which I had removed from the offer, as it was originally included).
I look forward to your feedback.
Best regards,
Christian
D
Deliverer11 Jun 2022 17:10Well... What do you want to know?
For the size of the system, the price is still reasonable. Of course, it would be more worthwhile if you also fully utilize the north side. How steep and how north-facing is the north roof?
Have you checked whether you can fit four rows across? You can also place the panels much closer to the ridge and closer to all edges.
If there are still any roofing works planned, could you possibly adjust the roof overhang so that more panels can be installed?
The goal should be not just to build a 6.4 kWp system. In the future, that would be just a drop in the bucket for an electric car’s roof load. Crosswise installation, four rows, including the north side, would already bring you to 16 kWp. Then an electric car can start charging more consistently. And in winter, during gloomy weather, if only about 10% of the system’s capacity is available, that will still be enough for the house and heat pump combined.
Regarding roofing work: The roofers should install the hooks right away. That way, you won’t have to remove all the tiles again a few days later.
For the size of the system, the price is still reasonable. Of course, it would be more worthwhile if you also fully utilize the north side. How steep and how north-facing is the north roof?
Have you checked whether you can fit four rows across? You can also place the panels much closer to the ridge and closer to all edges.
If there are still any roofing works planned, could you possibly adjust the roof overhang so that more panels can be installed?
The goal should be not just to build a 6.4 kWp system. In the future, that would be just a drop in the bucket for an electric car’s roof load. Crosswise installation, four rows, including the north side, would already bring you to 16 kWp. Then an electric car can start charging more consistently. And in winter, during gloomy weather, if only about 10% of the system’s capacity is available, that will still be enough for the house and heat pump combined.
Regarding roofing work: The roofers should install the hooks right away. That way, you won’t have to remove all the tiles again a few days later.
Deliverer schrieb:
Yeah... What do you want to know?
For the size of the system, the price is still reasonable. It would, of course, make more sense if you also fully utilized the north side. How steep and how north-facing is the north roof?
Have you checked if maybe four rows can fit across? You can also place modules much closer to the ridge and closer to all edges.
If there are still any roofing works to be done, could you perhaps adjust the eaves so that more modules fit?
The goal should be not just to build 6.4 kWp. In the future, that will only be a drop on the hot electric car roof. Cross-mounting, four rows, including north, gets us to about 16 kWp. Then an electric car will slowly start charging from your system. And if in winter, during cloudy weather, about 10% of the system’s capacity is available, that will be enough for the house and heat pump combined.
Regarding roofing work: The roofers should install the mounts (hooks) right away. Then you won’t have to remove all the tiles again a few days later. Thanks for the feedback, Deliverer.
The north roof is more northwest, with an azimuth angle of about +135 degrees. According to PVGIS, that results in an annual energy production of 647 kWh per 1 kWp. I wouldn’t mind installing modules there as well (e.g., 3.5 kWp?), but I can’t really judge if that’s worthwhile. I’ll talk to my electrician to see how that affects the average price per kWp. The roof pitch is about 35 degrees.
In the next few years, we plan to replace the old double garage with a carport, which will give me plenty of additional space for photovoltaics.
I have to decide in the next few days, as the materials need to be ordered. I appreciate any advice 🙂
D
Deliverer11 Jun 2022 22:45650 kWh/kWp is usually not bad. A year ago, this was clearly economically viable. Currently, prices have increased significantly, which makes it a bit more challenging.
Once there is a heat pump in the house, every kWp is worthwhile (even on the north side). When it’s cloudy, every orientation performs about the same. And as is well known, winter is often cloudy.
In general, it makes sense to install the full system at once, rather than adding pieces every few years. Each time you do that, you incur the "one-time effort" and need an additional inverter. The latter doesn’t cost more just because you add a north-facing section. But if you need a second inverter because you realize a year later that 6.4 kWp is too small, that will cost an extra 2000 euros. Plus additional paperwork, plus an electrician.
If a south-facing system currently costs 1500 euros, adding 3 kWp more will reduce the cost to 1400 euros for the south-facing part. Each additional kWp on the north side should then cost only 900 euros. That makes it worthwhile.
Where you can save money: a meter replacement is free. Anyone who says otherwise is not telling the truth. Only the solar installer’s electrician is authorized to commission the system. Your grid operator is welcome to come by but does NOT get paid for it. This is exactly stated in the Renewable Energy Act and Metering Point Operation Act.
And take it from someone with almost 30 kWp: ANY photovoltaic system is too small!
Once there is a heat pump in the house, every kWp is worthwhile (even on the north side). When it’s cloudy, every orientation performs about the same. And as is well known, winter is often cloudy.
In general, it makes sense to install the full system at once, rather than adding pieces every few years. Each time you do that, you incur the "one-time effort" and need an additional inverter. The latter doesn’t cost more just because you add a north-facing section. But if you need a second inverter because you realize a year later that 6.4 kWp is too small, that will cost an extra 2000 euros. Plus additional paperwork, plus an electrician.
If a south-facing system currently costs 1500 euros, adding 3 kWp more will reduce the cost to 1400 euros for the south-facing part. Each additional kWp on the north side should then cost only 900 euros. That makes it worthwhile.
Where you can save money: a meter replacement is free. Anyone who says otherwise is not telling the truth. Only the solar installer’s electrician is authorized to commission the system. Your grid operator is welcome to come by but does NOT get paid for it. This is exactly stated in the Renewable Energy Act and Metering Point Operation Act.
And take it from someone with almost 30 kWp: ANY photovoltaic system is too small!
F
fromthisplace12 Jun 2022 22:02Deliverer schrieb:
And trust someone with nearly 30 kWp: ANY photovoltaic system is too small!That's right. I was quite disappointed that we could only fit 11.7 kWp on our roof.
Go ahead and fully utilize the roof. The price is reasonable.
H
HoisleBauer2213 Jun 2022 00:50May I ask the professionals for their opinion on this offer:
53 Trina Vertex S TSM-400DE09M.08 - 400 Watt - Black Frame modules with optimizers and mounting system including installation (21 kWp)
SolarEdge POWER OPTIMIZER S440 (MC4)
SolarEdge SE10K-EN4 with e-meter
Surge protection
Charging station openWB series2 standard+ (with 7 m (23 ft) charging cable and touch display) and cable holder, etc.
for approximately €39,500 including VAT. Delivery time up to 24 months.
As a small business owner, the VAT would be reclaimable, so about €31,000 (charging station excluded) for 21 kWp. It’s a north- and south-facing roof.
Assumptions from the solar company:
- 21 kWp, 18 MWh annual production (28 modules facing azimuth 180 + 25 modules facing azimuth 360, roof pitch 45° – which is odd, because I indicated for south “azimuth orientation -20 (SSW)” and for north “azimuth about 160”)
- Self-consumption 4 MWh, 22% rate (based on the system’s 18 MWh production)
- Total consumption including electric car at 9 MWh per year, of which 4 MWh is covered by photovoltaics, which would correspond to a self-sufficiency rate of 44%.
53 Trina Vertex S TSM-400DE09M.08 - 400 Watt - Black Frame modules with optimizers and mounting system including installation (21 kWp)
SolarEdge POWER OPTIMIZER S440 (MC4)
SolarEdge SE10K-EN4 with e-meter
Surge protection
Charging station openWB series2 standard+ (with 7 m (23 ft) charging cable and touch display) and cable holder, etc.
for approximately €39,500 including VAT. Delivery time up to 24 months.
As a small business owner, the VAT would be reclaimable, so about €31,000 (charging station excluded) for 21 kWp. It’s a north- and south-facing roof.
Assumptions from the solar company:
- 21 kWp, 18 MWh annual production (28 modules facing azimuth 180 + 25 modules facing azimuth 360, roof pitch 45° – which is odd, because I indicated for south “azimuth orientation -20 (SSW)” and for north “azimuth about 160”)
- Self-consumption 4 MWh, 22% rate (based on the system’s 18 MWh production)
- Total consumption including electric car at 9 MWh per year, of which 4 MWh is covered by photovoltaics, which would correspond to a self-sufficiency rate of 44%.
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