ᐅ Evaluating the Proposal and Technology of a Photovoltaic System
Created on: 30 Jan 2023 12:00
H
hanghaus2023
Hello,
I am planning to equip my house with a photovoltaic system.
Electricity consumption: 7100 kWh per year
Southwest orientation, roof pitch 45 degrees
Most affordable photovoltaic offer:
23 * modules
Jolywood JW-HD108N-420W (frame: black, backsheet: glass)
- Best price-performance ratio: high nominal power of 420 W per module and an efficiency of 21.51%.
- Linear power warranty for 30 years (minimum 87.4% after this period).
- 25 years product warranty from the manufacturer.
- Half-cut cells: two separate cell areas connected in series reduce shading losses.
- Front and back glass with anti-reflective technology.
23 * modules DC installation including scaffolding
1 * Sungrow SBR096 9.6 kWh
- High-voltage lithium iron phosphate battery with multi-level protection concept and comprehensive safety certifications.
- Up to 30A continuous charge and discharge current with high efficiency and 100% usable energy.
- Plug & Play, no wiring required between individual battery modules.
- Of the total price, €4,476.16 net is allocated to the battery storage.
1 * Sungrow Hybrid SH8.0RT
- Three-phase hybrid inverter for residential use.
- Fast charging/discharging to easily manage consumption peaks.
- High self-consumption through optimized integrated energy management system.
- Remote firmware updates and customizable settings.
- Quick and easy installation, commissioning via smartphone.
1 * AC installation for Sungrow SBR096 9.6 kWh battery with Sungrow inverter(s)
According to the provider, the meter cabinet does not incur any additional costs.
Note:
The cost for the required additional electricity meter is not included in the purchase price. Your local grid operator is responsible for installing this meter and will charge you separately for this service.
Net price: €26,192
The provider is relatively new to the market and has 150 ***** reviews on Google.
Previously, I received offers with lower specifications starting above €50,000.
Is there anything to consider regarding taxes?
Honestly, I have no expertise in this area. Is there an expert here who can technically and financially evaluate the most affordable offer for me?
Thank you very much for your help from
hanghaus2023
I am planning to equip my house with a photovoltaic system.
Electricity consumption: 7100 kWh per year
Southwest orientation, roof pitch 45 degrees
Most affordable photovoltaic offer:
23 * modules
Jolywood JW-HD108N-420W (frame: black, backsheet: glass)
- Best price-performance ratio: high nominal power of 420 W per module and an efficiency of 21.51%.
- Linear power warranty for 30 years (minimum 87.4% after this period).
- 25 years product warranty from the manufacturer.
- Half-cut cells: two separate cell areas connected in series reduce shading losses.
- Front and back glass with anti-reflective technology.
23 * modules DC installation including scaffolding
1 * Sungrow SBR096 9.6 kWh
- High-voltage lithium iron phosphate battery with multi-level protection concept and comprehensive safety certifications.
- Up to 30A continuous charge and discharge current with high efficiency and 100% usable energy.
- Plug & Play, no wiring required between individual battery modules.
- Of the total price, €4,476.16 net is allocated to the battery storage.
1 * Sungrow Hybrid SH8.0RT
- Three-phase hybrid inverter for residential use.
- Fast charging/discharging to easily manage consumption peaks.
- High self-consumption through optimized integrated energy management system.
- Remote firmware updates and customizable settings.
- Quick and easy installation, commissioning via smartphone.
1 * AC installation for Sungrow SBR096 9.6 kWh battery with Sungrow inverter(s)
According to the provider, the meter cabinet does not incur any additional costs.
Note:
The cost for the required additional electricity meter is not included in the purchase price. Your local grid operator is responsible for installing this meter and will charge you separately for this service.
Net price: €26,192
The provider is relatively new to the market and has 150 ***** reviews on Google.
Previously, I received offers with lower specifications starting above €50,000.
Is there anything to consider regarding taxes?
Honestly, I have no expertise in this area. Is there an expert here who can technically and financially evaluate the most affordable offer for me?
Thank you very much for your help from
hanghaus2023
xMisterDx schrieb:
I’m working remotely at a facility abroad, that’s not an excuse 😉
No... a basic allowance always has to be available. But it can’t be that the cashier is sitting by candlelight because the electricity price shoots up to 60 cents/kWh (60 cents per kWh), while her neighbor, the CEO, at the same time turns on his sauna and pool heating because he doesn’t care about the 60 cents/kWh (60 cents per kWh) at all.I don’t want to start a class conflict here – but if we don’t work dynamically, we have to expand massively instead – and that will be passed on again through network charges (grid fees / distribution charges). There is no free lunch.
RotorMotor schrieb:
If you’re such a fan of storage systems, then calculate what economic benefit it actually brings.Disclaimer upfront: Since the calculation involves electricity prices, any purchase of this type can only be considered a "bet," as no one has a crystal ball.
We bought the storage system for around 6800€ (about 6800€). It has a capacity of 12.3 kWh with a 7-year warranty.
Within the warranty period, that means 7*365 days = 2555 days.
Based on our experience so far, we can easily fully charge the battery during the day even in September. I’m also optimistic for October because we are already fully charged by midday at the latest. For simplicity, I assume we can fill the battery completely for three seasons, and in winter I only estimate 50% capacity.
Currently, we empty the battery every evening and night, and since we are not yet in heating season, I don’t see any problem using it fully all year round.
3/4 of 2555 days = about 1916 days, with a full cycle per day = 12.3 kWh × 1916 = 23,566 kWh
1/4 of 2555 days = about 639 days, with half a cycle per day = 6.15 kWh = 3,930 kWh
This adds up to a total of 27,496 kWh we do not need to draw from the grid at the current rate of approx. €0.39 (39 cents) = €10,723
Minus €2,254.67 lost feed-in tariff
= about €8,469 > €6,800 initial cost.
I haven’t considered charging/discharging losses, as I’m not knowledgeable enough about those. Even if I deduct another 10% for that, I would still be in the black.
We have bet that:
- we will manage to fill the battery on average more than 50% even during the winter months (which would improve the balance)
- electricity prices will rise over the coming 7 years, not fall
- the battery will not fail on the day the warranty expires.
H
hausbau_phobos19 Sep 2023 16:31What is the size of your photovoltaic system, and what is its orientation and roof pitch for this calculation?
hausbau_phobos schrieb:
What is the size of your photovoltaic system, and how is it oriented including the roof pitch for this calculation?The photovoltaic system is 12.45 kWp. The modules are bifacial. Orientation is hard to specify exactly; we have modules installed on all sides except the north side (our roof is not ideal for photovoltaics). The calculation is based on our experience since moving in. We moved in at the beginning of September, and since then our best daily generation was 60 kWh. So far, we have always been able to fully charge our battery storage. Autumn and spring have proven to be good months for photovoltaics. Winter remains to be seen.
Hello,
I wouldn’t be so sure about that. The generation itself (wind/solar) is free, that’s true. But the required investments increase with a higher share of renewables. I increasingly need more transmission lines and more (fossil) backup power plants, which often stand idle for up to 95% of the year and are only needed for short periods (but then absolutely necessary). Near Ingolstadt, there is one of the most modern gas turbine power plants in the world. It operates less than 200 (two hundred) hours per year. In the end, someone has to pay for that, and all these costs are passed on through grid fees.
There are also smaller factors like inflation and similar issues. Expanding and maintaining the grid is certainly not going to be cheaper in 20 years than it is today.
In short, I am very, very sure that electricity prices will continue to rise steadily. Whether the average increase over the next 20 years will be closer to 2% per year or rather 10%? I would like to know that as well…
Best regards,
Andreas
xMisterDx schrieb:
It is far from certain that electricity prices will rise. The more green electricity there is on the grid, the cheaper it gets, because operating costs are eliminated. Wind power is free, and it doesn’t have to be shipped here from Australia or Venezuela.
I wouldn’t be so sure about that. The generation itself (wind/solar) is free, that’s true. But the required investments increase with a higher share of renewables. I increasingly need more transmission lines and more (fossil) backup power plants, which often stand idle for up to 95% of the year and are only needed for short periods (but then absolutely necessary). Near Ingolstadt, there is one of the most modern gas turbine power plants in the world. It operates less than 200 (two hundred) hours per year. In the end, someone has to pay for that, and all these costs are passed on through grid fees.
There are also smaller factors like inflation and similar issues. Expanding and maintaining the grid is certainly not going to be cheaper in 20 years than it is today.
In short, I am very, very sure that electricity prices will continue to rise steadily. Whether the average increase over the next 20 years will be closer to 2% per year or rather 10%? I would like to know that as well…
Best regards,
Andreas
Hello,
Best regards,
Andreas
kati1337 schrieb:Unfortunately, I have to be a spoiler here. Your acquisition costs are not €6800, but €6800 plus interest and compound interest over 7 years. At the current rate of about 4%, this amounts to €8950. So, with the current electricity prices, you are actually paying about €500 more.
= approx. €8469 > €6800 acquisition costs.
Best regards,
Andreas
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