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.
K
karl.jonas23 Dec 2022 17:39Understood. By "purchase," I meant electricity.
B
Bausparfuchs24 Dec 2022 13:18Realistically, your system will probably generate around 12,000 kWh annually. Without a storage system, you would consume about 4,000 kWh of that yourself.
8,000 kWh would be fed into the grid.
With an appropriate storage system, you might be able to consume up to 7,000 kWh yourself.
Therefore, I would recommend building a smaller system and adding a storage unit. The talk about falling electricity prices is complete nonsense. In the last 40 years, electricity prices have never decreased, and they won’t do so in the next 40 years either.
You only need to look at fuel prices. The oil price keeps dropping, but fuel prices stay high. Wholesale electricity prices are falling dramatically, yet widespread electricity price increases between 50 and 100 percent are happening nonetheless. Thanks to the electricity price cap.
With a Renewable Energy Act feed-in tariff of 7.5 cents per kWh, there’s no point in starting with a small photovoltaic system. Even if you fed all the electricity into the grid and received 8 cents per kWh, you would only get about 960 in feed-in remuneration. Your electricity bill would still amount to around 3,200 euros with your 8,000 kWh consumption, minus the feed-in remuneration and including the electricity price cap. But this will expire again in April 2024.
Prices could then be as high as 60 cents per kWh.
A cost-benefit calculation would be ideal with a 10 kWp system combined with a 15 kWh storage unit.
You should expect zero output in January and December. There’s simply no generation then, although these are also the months when heating demand is highest.
8,000 kWh would be fed into the grid.
With an appropriate storage system, you might be able to consume up to 7,000 kWh yourself.
Therefore, I would recommend building a smaller system and adding a storage unit. The talk about falling electricity prices is complete nonsense. In the last 40 years, electricity prices have never decreased, and they won’t do so in the next 40 years either.
You only need to look at fuel prices. The oil price keeps dropping, but fuel prices stay high. Wholesale electricity prices are falling dramatically, yet widespread electricity price increases between 50 and 100 percent are happening nonetheless. Thanks to the electricity price cap.
With a Renewable Energy Act feed-in tariff of 7.5 cents per kWh, there’s no point in starting with a small photovoltaic system. Even if you fed all the electricity into the grid and received 8 cents per kWh, you would only get about 960 in feed-in remuneration. Your electricity bill would still amount to around 3,200 euros with your 8,000 kWh consumption, minus the feed-in remuneration and including the electricity price cap. But this will expire again in April 2024.
Prices could then be as high as 60 cents per kWh.
A cost-benefit calculation would be ideal with a 10 kWp system combined with a 15 kWh storage unit.
You should expect zero output in January and December. There’s simply no generation then, although these are also the months when heating demand is highest.
X
xMisterDx28 Dec 2022 21:17Since the heat pump is mainly used in winter, when the sun is low and provides very little power, achieving 50% self-consumption with around 17,000 kWh/year is purely an illusion.
Unless you drive 500 km (310 miles) daily in the summer with your electric car.
PS:
Even if you assume 20 kWh/100 km (20 kWh/62 miles) for the electric car... with 5,000 kWh you would cover about 25,000 km (15,500 miles). And half of that would be during the darker months.
Unless you drive 500 km (310 miles) daily in the summer with your electric car.
PS:
Even if you assume 20 kWh/100 km (20 kWh/62 miles) for the electric car... with 5,000 kWh you would cover about 25,000 km (15,500 miles). And half of that would be during the darker months.
M
Marvinius29 Dec 2022 14:02xMisterDx schrieb:
Since the heat pump is mainly needed in winter, when the sun is low and produces very little power, achieving 50% self-consumption at around 17,000 kWh/year is pure illusion.
Unless you drive 500 km (310 miles) daily with the electric car in summer.
PS:
Even if you assume 20 kWh/100 km (32 kWh/62 miles) for the electric car... with 5,000 kWh (5,000 kWh) you get about 25,000 km (15,500 miles). And half of that is during the darker months. My electric car uses 25 kWh/100 km (40 kWh/62 miles) including charging losses in summer and 30 kWh/100 km (48 kWh/62 miles) in winter....
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