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
andimann schrieb:
Hello,
Unfortunately, I have to be a spoiler again. Your acquisition cost is not 6800 €, but 6800 € including interest and compound interest over 7 years. At the current rate of about 4%, that amounts to 8950 €. So, with the current electricity prices, you are paying about 500 € extra.
Best regards,
AndreasI am still quite satisfied with it, as we have, as I said, calculated somewhat pessimistically in places, and I also hope that the unit won’t fail on the exact day the warranty expires. Besides, I like using the electricity generated on our roof. There’s no greenwashing or certificate trading involved. 😉
Edit: Also, if we consider interest, we should also factor in the likelihood of rising electricity prices.
R
RotorMotor19 Sep 2023 18:24kati1337 schrieb:
I’m still fairly satisfied with it, since as I said, we calculated quite pessimistically in some areas, and I also hope that the system doesn’t fail on the day the warranty expires. You call one full cycle per day pessimistic?
That’s just extremely optimistic.
And just because you manage to empty the storage frequently doesn’t mean it’s actually sensible.
For example, you could definitely schedule many loads during the day, and in summer the days are simply longer.
In those cases, you won’t be able to sensibly empty such a large storage every day.
kati1337 schrieb:
Also, I like using the electricity that comes from our roof. There’s no greenwashing or certificate trading involved. 😉 And sending it through a storage isn’t greenwashing?
And keep in mind, it’s not guaranteed that the storage feeds into the phase you’re currently consuming on. ;-)
kati1337 schrieb:
Also, if we factor in interest rates, we should also consider the likelihood of rising electricity prices.You’re right. The question is whether the increase in electricity prices will offset the financing costs of the storage system?! No one can say that for sure right now, and you’ll only find out in 10 years. As I mentioned before, a storage system is basically a gamble on rising electricity prices.
But I can definitely understand that it feels good to use “your own” electricity!
Best regards,
Andreas
You have to look at it this way: not every technical feature in a house can be justified purely from an economic perspective. No one calculates the cost-effectiveness of wiring, for example.
In the case of @kati1337, you also have to consider that two people work from home, both enjoy playing power-intensive games, and they have a heat pump, an electric car, and ventilation. And yes, you have to take the production footprint of the storage system into account, but I trust that @kati1337 will try to plan their electricity consumption in a way that minimizes or almost completely eliminates grid usage. I do see this as a relief for the grid itself.
Also, I have to agree with @sysrun80. We urgently need widely available variable electricity tariffs. It’s essential that everyone starts thinking about their consumption and how to manage it. It doesn’t help when the “wealthy” can afford expensive time slots—they can already afford them now.
And yes, not everyone can shift every type of electricity use to times that are beneficial for the grid, but everyone should take the time to learn about the features of their electrical appliances—such as time-controlled switching on and off, for example. It’s such a trend now for kitchen and white goods to be smart, so it’s worth actually using those features.
In the case of @kati1337, you also have to consider that two people work from home, both enjoy playing power-intensive games, and they have a heat pump, an electric car, and ventilation. And yes, you have to take the production footprint of the storage system into account, but I trust that @kati1337 will try to plan their electricity consumption in a way that minimizes or almost completely eliminates grid usage. I do see this as a relief for the grid itself.
Also, I have to agree with @sysrun80. We urgently need widely available variable electricity tariffs. It’s essential that everyone starts thinking about their consumption and how to manage it. It doesn’t help when the “wealthy” can afford expensive time slots—they can already afford them now.
And yes, not everyone can shift every type of electricity use to times that are beneficial for the grid, but everyone should take the time to learn about the features of their electrical appliances—such as time-controlled switching on and off, for example. It’s such a trend now for kitchen and white goods to be smart, so it’s worth actually using those features.
RotorMotor schrieb:
So you call one full cycle per day pessimistic?
That’s just extremely optimistic.
And just because you manage to frequently empty the battery doesn’t mean it’s actually practical.
For example, you could probably schedule many loads during the day, and in summer the days are simply longer.
In that case, you won’t be able to meaningfully empty such a large battery every day. Well, we have been doing it for 19 days now, and we had it fully charged 19 times, and empty in the morning 19 times?
We draw between 0 and 4 kWh (3.5 kWh) from the grid in the morning, that’s it so far. This isn’t overly optimistic; it is currently just a fact.
Unless September is for some unknown reason an exceptionally good month for photovoltaic power?
I’m not saying the battery will pay off as well for other families as it does for us. But with dual home office plus our loads, the battery complements us extraordinarily well.
RotorMotor schrieb:
And note, the battery doesn’t have to feed power into the phase where you are currently consuming. ;-) The battery is only allowed to supply power to the house. We have a PTH metering concept, where it is not permitted to charge or discharge the battery through the grid. Since we feed in surplus, it must be ensured that no non-renewable energy law electricity can be fed into the grid.
Since we currently draw a maximum of 3-4 kWh (3.5 kWh) from the grid, and exactly at times when the battery is empty in the morning, I am quite confident that we consume our own generated electricity.
andimann schrieb:
You’re right. The question is whether the increase in electricity prices offsets the financing costs of the battery?!? Nobody can say that at the moment, and you will only know in 10 years. As I already wrote; a battery is basically a bet on rising electricity prices. That’s true, although I also consider 4% a bit optimistic? But I don’t really know, I’m not very familiar with fixed-term deposits. Fair enough, when we ordered the battery, fixed-term deposits were not at 4% yet – so I couldn’t know that back then. 😉
And the battery reduces our monthly electricity advance payments significantly. The freed-up money that I don’t have to pay the utility could then also be invested. We can balance that against financing costs again. 😉
But you probably notice: the battery was also a bet for us from an ideological perspective. We enjoy every day when we look at our self-sufficiency. And if there’s a power outage (which happens quite often in our area), we can keep working or cooking.
All of that together is worth the 500 € (about $540) over 7 years to me. 😉
kati1337 schrieb:
Since we feed surplus energy into the grid, it must be ensured that no non-renewable energy law electricity can be fed into the grid.That alone is so typically Germany 😉 So incredibly pointless that it almost hurts.
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