Assessment of Photovoltaic System Offer

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 possible.
We want to completely fill the south side of the roof (total 6.4 kwp). Without storage. Since we are also 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 after the roofing work. It will be handled/carried out by an acquaintance who is always available to support us with advice and assistance. We are beginners in this field.

With a total of 10K net, I come to an average of €1562.50 per kwp.

Title 02 in the compilation refers to the Home Manager and not to the energy storage (which I had removed from the offer, it was originally included).

I look forward to the feedback.

Best regards
Christian

Jo... What do you want to know?

For the size of the system, the price is still bearable. Of course, it would be more worthwhile if you also fully cover the north side. How steep and how north-facing is the north roof? Have you checked if maybe four rows could go crosswise? You can also be much closer to the ridge and anyway closer to all edges. If there are still "Dachdeckerarbeiten" you might be able to change something at the roof overhang so that more can fit? The goal should be not just to build 6.4 kWp. That’s just a drop in the bucket for the hot electric car roof in the future. Cross mounting, four rows, north added, we’re already at 16. That’s when an electric car also slowly starts charging. And if, in winter, in bad weather, 10% of the system’s capacity is available, that’s enough for the house and heat pump together.

Topic Dachdeckerarbeiten: The roofers should set the hooks right away. Then you don't have to take all the tiles off again a few days later.

Yeah... What do you want to know?

For the size of the system, the price is still bearable. Of course, it would be more worthwhile if you also fully equipped the north side. How steep and how northern is the north roof?
Have you checked if maybe four rows could go on crosswise? You can also get much closer to the ridge and anyway closer to all edges.
If there are still "roofing works" to be done - maybe you can change something at the eaves so that more fits?
The goal should be not just to build 6.4 kWp. In the future, that's just a drop on the hot e-car roof. Crosswise installation, four rows, north included, we're already at 16. Then an e-car starts to slowly charge. And if in winter, in bad weather, 10% of the system's output is available, then that's enough for the house and heat pump together.

Regarding roofing work: The roofers should put the hooks on right away. That way you don't have to remove all the tiles again a few days later.

Thanks for the feedback, Deliverer.

The north roof is more northwest, the azimuth angle is 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 here as well (e.g. 3.5 kWp?), but I can’t really assess whether that makes sense. I’ll talk to my electrician about how this affects the average price per kWp. The roof pitch is about 35 degrees.

In the next few years, we want to replace the old double garage with a carport > here I will then have plenty of space for photovoltaics again.

I have to decide in the next few days because the material has to be ordered. I am grateful for any advice :)

650 kWh/kWp is normally not bad. A year ago, the situation was clearly economical. Currently, prices have simply risen significantly, which makes it a bit more difficult.
As soon as there is a heat pump in the house, every kWp is worthwhile (even on the north side). As soon as it is cloudy, every orientation is equally good. And in winter, this is known to be very frequent.

In general, it makes sense to do it FULL once, rather than adding a bit every few years. Because every time, that costs the "one-time effort" and an additional inverter.
The latter doesn't cost more just because north is added. But as soon as you need a second inverter because you realize a year later that 6.4 kWp is way too small, it costs you 2000 euros extra. Plus additional paperwork for registration, plus electrician.

If south currently costs 1500 euros, south costs 1400 euros if you add another three kWp. Every additional kWp on the north side should then only cost 900 euros. Then it will be worthwhile.

Wherever you can save money: a meter exchange is free. Anyone who says otherwise is lying. And the commissioning is DONE ONLY by the electrician of the solar installer. Your grid operator may come by, but does NOT get paid for it. Everything is written exactly like this in the Renewable Energy Act and MsbG.

And let someone with just under 30 kWp tell you: EVERY photovoltaic system is too small!

And let someone with almost 30 kWp tell you: EVERY photovoltaic system is too small!

That's right. I was quite disappointed that only 11.7 kWp fit on our roof. Now fill the roof completely. The price is reasonable.

May I ask the professionals, what do you think of this offer: 53 Trina Vertex S TSM-400DE09M.08 - 400 Watt - Black Frame Module with optimizer and substructure including installation (21 KWp) SolarEdge POWER OPTIMIZER S440 (MC4) SolarEdge SE10K-EN4 with E-Meter Surge protection Charging station openWB series2 standard+ (with 7m charging cable and touch display) and cable holder etc. for approx. €39,500 including VAT Delivery time up to 24 months The VAT would be refunded as a small business owner, so €31K (charging station excluded) for 21 kWp. It is a north and south roof. Assumption of the solar company: - 21 kWp, 18 MWh annual production (28 modules at azimuth 180 + 25 modules at azimuth 360, roof pitch 45° - here it is strange, I specified "orientation azimuth -20 (SSW)" for south and "azimuth approx. 160" for north...) - Self-consumption 4 MWh, 22% rate (based on the production of the system with 18 MWh) - Total consumption including e-car at 9 MWh p.a., of which 4 MWh covered by photovoltaics, would mean a degree of self-sufficiency of 44%.