ᐅ Accept an offer for a 16 kWp photovoltaic system at this time?
Created on: 14 Dec 2022 20:27
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Pitiglianio
I need your opinion on the following offer for a photovoltaic system.
Gable roof with a 23-degree pitch, fully covered on both sides with a total of 40 modules, approximately 16-17 kWp, depending on the modules available at that time.
Southwest orientation, no shading.
No battery storage.
Includes all installation work, scaffolding, connection, and registration: 28,000 net.
House details: Single-family home, 135 sqm (1,452 sq ft), KfW 55 standard, air-to-water heat pump, controlled ventilation system, 3 occupants, aquarium, possible electric car in 2 years. Estimated annual electricity consumption: 8,000 kWh.
Gable roof with a 23-degree pitch, fully covered on both sides with a total of 40 modules, approximately 16-17 kWp, depending on the modules available at that time.
Southwest orientation, no shading.
No battery storage.
Includes all installation work, scaffolding, connection, and registration: 28,000 net.
House details: Single-family home, 135 sqm (1,452 sq ft), KfW 55 standard, air-to-water heat pump, controlled ventilation system, 3 occupants, aquarium, possible electric car in 2 years. Estimated annual electricity consumption: 8,000 kWh.
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Bausparfuchs31 Dec 2022 18:02A photovoltaic system does not generate 10 to 30 percent of its output in December/January as some uninformed people here claim. That is completely unrealistic.
My system produced about 700 kWh of electricity in August 2022. In December 2023, which is ending today, it only generated 30 kWh (4%). Anyone expecting electricity for a heat pump will be disappointed. No matter how large the system is, it will not produce more than about 5 percent of its rated capacity.
When there is snow or frost on the system, it produces nothing at all.
My system produced about 700 kWh of electricity in August 2022. In December 2023, which is ending today, it only generated 30 kWh (4%). Anyone expecting electricity for a heat pump will be disappointed. No matter how large the system is, it will not produce more than about 5 percent of its rated capacity.
When there is snow or frost on the system, it produces nothing at all.
I don’t understand your entire percentage calculation...
The main thing is to just claim something...
Bausparfuchs schrieb:30% of what? And who says that? My yield forecast assumes 1.7% in December and 2.5% in January, based, of course, on the annual production. This expectation assumes that the modules are not covered; snow periods are thus excluded. My actual values are above and anyone can calculate them, although it doesn’t help much because, as mentioned, the winter weather has a big impact. I have yet to see anyone claim to be fully self-sufficient with a heat pump in winter. But having or buying 400 kWh (400 kWh) per month is also a contribution to the bigger picture.
A photovoltaic system does not produce 10 to 30 percent in December/January as some uninformed people here claim. That is completely unrealistic.
Bausparfuchs schrieb:Whatever your 4% means. 4% of August? What kind of calculation is that when everyone knows August is not the month with the highest yield?
My system produced about 700 kWh (700 kWh) in August 2022. In December 2023, which just ended today, it was only 30 kWh (30 kWh) (4%).
Bausparfuchs schrieb:That’s complete nonsense. With good weather, I have no problem exceeding 20% in December, and I don’t even have a south-facing system; part of the surface is shaded until midday. I can gladly provide logged data for this.
No matter the size of the system, no more than 5 percent of the nominal output comes out.
Bausparfuchs schrieb:This has long been disproven. Frost hardly matters, and a thin snow layer of up to about 1 cm (0.4 inches) still performs quite well; only then does output drop sharply.
With snow or frost on the system, nothing works at all.
The main thing is to just claim something...
Even my small balcony solar system with 600 watts has already generated 12 kWh this December. We also had snow, and the sun was so low that for 1 or 2 hours the south-facing panel was always half shaded by the house opposite during the short daylight hours. However, this is improving day by day. Of course, 12 kWh is more of a symbolic figure, but I’m looking forward to the sun rising higher again now.
By the way, I have only had this balcony solar system in operation since mid-November. It already produced 13 kWh in the second half of November. I’m very curious to see how the monthly output will develop.
By the way, I have only had this balcony solar system in operation since mid-November. It already produced 13 kWh in the second half of November. I’m very curious to see how the monthly output will develop.
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DaGoodness31 Dec 2022 20:41Bausparfuchs schrieb:
A photovoltaic system does not produce 10 to 30 percent in December/January, as some uninformed people here claim. That is completely unrealistic.
My system generated about 700 kWh of electricity in August 2022. In December 2023, which is ending today, it only produced 30 kWh (4%). Anyone expecting power for a heat pump will be disappointed. No matter the size of the system, you won’t get more than about 5 percent of the rated output.
If the system is covered by snow or frost, it produces nothing. My 10 kWp system produced exactly 294 kWh in December. I consumed 1,150 kWh.
That means I produced 25 percent of my December consumption myself.
Just because your system didn’t perform as well (for whatever reasons), doesn’t mean your experience applies to all other systems.
My system is, of course, not representative. Additionally, I use it to charge my fully electric vehicle, which averages about 1200 km (750 miles) per month (December was slightly higher), which naturally improves the self-consumption rate significantly. I have not yet included the electricity consumption for the separate heat pump in the table... My system has only 6.5 kWp, but it is optimally tilted at 45° exactly south-facing, which is advantageous for winter. The system planned by the original poster will achieve different (worse) winter values. However, the 1290 kWh per installed kWp is more than both I and the solar installer had expected ;-)
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