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
E
Elias_dee26 Jul 2022 15:38i_b_n_a_n schrieb:
Is it necessary? I can’t fully assess the current situation, which also varies regionally. I already thought my system ordered two years ago per kWp was "too expensive." But a simple gable roof with a relatively large system only involves one-time costs. My opinion: outrageous. Regardless of when the system pays off, I would probably do it anyway (there was a reliable forecast predicting 50–55 cents per kWh). Then, even if the photovoltaic system is not yet environmentally friendly, it looks different economically as well. Actually, I would say I’m waiting a bit longer—but since this concerns a new build, the scaffolding and so on are already in place. So now would be the ideal time :-) I’ll wait for the other offer and then give you feedback.
R
RotorMotor26 Jul 2022 16:16I’m usually a fan of fully covering the roof, but at that price, I can hardly imagine that a North-facing orientation is worthwhile. And on top of that, with such a complex mounting system, which might even cast shadows on the modules below.
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Neubau202226 Jul 2022 16:20Elias_dee schrieb:
Actually, I would say I’ll wait a bit longer – but since this is a new build, the scaffolding and everything are still there at the moment. So now is actually the perfect time 🙂 I’ll wait for the other quote and then get back to you.Ask @TmMike_2. He has invested in photovoltaic modules and still has quite a stock. He might be able to offer better prices.
E
Elias_dee26 Jul 2022 20:12I have now done a more detailed calculation. Even with rather pessimistic assumptions, I don’t find any scenario where the system would make a loss. Please feel free to correct me if any of the assumptions are off…
Let’s say the 20.5 kWp system produces 18,000 kWh per year. I can use 20% of that myself (currently for an air-to-water heat pump, maybe an electric car later). The grid electricity price is €0.35 and the feed-in tariff is €0.0765 ((8.2 cents + 7.1 cents) / 2).
Calculation over 20 years:
Saved electricity costs per year: 18,000 kWh * 0.2 * €0.35 → €1,260
Feed-in tariff per year: 18,000 kWh * 0.8 * €0.0765 → €1,102
This sums up to approximately €47,000 income over 20 years.
Against that, there are expenses of €30,000 (net) plus about 20 × €200 for operating costs/insurance etc., so €4,000, totaling €34,000 expenses.
€47,000 - €34,000 = €13,000 profit.
Am I making any mistakes in these calculations?
Even if the output drops to only 15,000 kWh, there would still be a profit (a surplus of €5,000)…
Let’s say the 20.5 kWp system produces 18,000 kWh per year. I can use 20% of that myself (currently for an air-to-water heat pump, maybe an electric car later). The grid electricity price is €0.35 and the feed-in tariff is €0.0765 ((8.2 cents + 7.1 cents) / 2).
Calculation over 20 years:
Saved electricity costs per year: 18,000 kWh * 0.2 * €0.35 → €1,260
Feed-in tariff per year: 18,000 kWh * 0.8 * €0.0765 → €1,102
This sums up to approximately €47,000 income over 20 years.
Against that, there are expenses of €30,000 (net) plus about 20 × €200 for operating costs/insurance etc., so €4,000, totaling €34,000 expenses.
€47,000 - €34,000 = €13,000 profit.
Am I making any mistakes in these calculations?
Even if the output drops to only 15,000 kWh, there would still be a profit (a surplus of €5,000)…
With 20.5 kWp installed on the north and south sides, you should expect about 80 - 85% yield:
16,400 kWh
How much household electricity consumption do you estimate overall?
3,000 kWh? 4,000 kWh?
Without storage, you will probably be able to use a maximum of 1,500 to 2,000 kWh yourself.
Pessimistically, 1,500
It would be similar with a heat pump… most energy is needed from November to March. During this period, photovoltaic power is rather low. So maybe a total of 1,000 kWh
2,500 x 0.35 = 875 Euro
13,900 x 0.0765 = 1,064 Euro
Total 1,939 x 20 = 38,780 Euro
In 20 years, you can plan for a new inverter on each side. So 2 x 2,000 Euro
With 200 Euro operating costs, you end up breaking even
But don’t forget the financing costs…
However, every additional kWh self-consumed improves the return on investment.
Also, prices will probably continue to rise.
So: install the system
16,400 kWh
How much household electricity consumption do you estimate overall?
3,000 kWh? 4,000 kWh?
Without storage, you will probably be able to use a maximum of 1,500 to 2,000 kWh yourself.
Pessimistically, 1,500
It would be similar with a heat pump… most energy is needed from November to March. During this period, photovoltaic power is rather low. So maybe a total of 1,000 kWh
2,500 x 0.35 = 875 Euro
13,900 x 0.0765 = 1,064 Euro
Total 1,939 x 20 = 38,780 Euro
In 20 years, you can plan for a new inverter on each side. So 2 x 2,000 Euro
With 200 Euro operating costs, you end up breaking even
But don’t forget the financing costs…
However, every additional kWh self-consumed improves the return on investment.
Also, prices will probably continue to rise.
So: install the system
R
RotorMotor26 Jul 2022 20:39Everything is rather optimistic.
Taxes on feed-in are also missing.
Just calculate for the south.
Taxes on feed-in are also missing.
Just calculate for the south.
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