ᐅ Evaluation of Solar Power System Proposal with Battery Storage
Created on: 26 Sep 2023 13:02
D
Dachshund90
Hello everyone,
After several inquiries and offers, I now have what I consider the most cost-effective offer (see details below). I am still unsure about the "necessity" of the battery storage. I believe there is no clear "yes" or "no" answer here.
Based on your experience and what is known so far, is the payback of the battery storage guaranteed within the warranty period? I don’t think the battery will make you rich or poor, but you can make the most sensible decision now.
How do you evaluate the offer and the components in general? Does anyone perhaps have a comparable system and experience to share?
Photovoltaic system 11.9 kWp with 9.6 kWh battery storage
Total price just under 24,500 € (euros)
Best regards
After several inquiries and offers, I now have what I consider the most cost-effective offer (see details below). I am still unsure about the "necessity" of the battery storage. I believe there is no clear "yes" or "no" answer here.
Based on your experience and what is known so far, is the payback of the battery storage guaranteed within the warranty period? I don’t think the battery will make you rich or poor, but you can make the most sensible decision now.
How do you evaluate the offer and the components in general? Does anyone perhaps have a comparable system and experience to share?
Photovoltaic system 11.9 kWp with 9.6 kWh battery storage
Total price just under 24,500 € (euros)
Best regards
Each additional module increases your yield. The marginal benefit may decrease, and you might incur step-wise costs related to inverters and string configurations (such as limits per kWp, having to choose the next larger size, separating strings if power differences are too high, etc.).
But in general, more is initially better, yes. Especially because this way you still get a reasonable yield even in less favorable conditions (although to optimize this, it would almost require filling the exterior walls completely as well).
But in general, more is initially better, yes. Especially because this way you still get a reasonable yield even in less favorable conditions (although to optimize this, it would almost require filling the exterior walls completely as well).
One of the few ways to make money is to produce electricity cheaply yourself and sell it. With the module prices currently at (I just bought heat pump modules for 110€ each for a small expansion), I would always fully cover the roof. Especially in autumn and winter, it’s great to still have enough leftover so you don’t have to buy electricity from the grid operator.
P.S. Truly green electricity is somewhat more expensive—I mean electricity that isn’t just greenwashed by certificates. For example, electricity from Green Planet Energy currently costs 35.8 cents per kWh. But this is really a matter of ideology, just like installing solar batteries. In my opinion, not everything needs to make “pure” financial sense. If it did, for example, one logically couldn’t belong to a church either. ;-)
P.S. Truly green electricity is somewhat more expensive—I mean electricity that isn’t just greenwashed by certificates. For example, electricity from Green Planet Energy currently costs 35.8 cents per kWh. But this is really a matter of ideology, just like installing solar batteries. In my opinion, not everything needs to make “pure” financial sense. If it did, for example, one logically couldn’t belong to a church either. ;-)
R
RotorMotor28 Sep 2023 12:18@Dachshund90 please describe your roof and the planned installation in more detail.
That way, recommendations on what is worthwhile and what is not can be made.
As an example:
1 kWp costs about 1000€ extra and produces around 1000 kWh per year, so the payback period at 8¢/kWh is about 12.5 years if you only feed the electricity into the grid.
If you use 20% of it yourself, the payback is already after 8 years. But you can adjust all the mentioned parameters according to your own situation to get an accurate result.
The IBC modules should have a 25-year warranty, if I am correct.
And with photovoltaics, you really do something for the environment by generating emission-free electricity.
Storage systems, on the other hand, only consume electricity themselves and just ensure that more electricity ends up with me instead of the neighbors, so initially, no one really benefits.
That way, recommendations on what is worthwhile and what is not can be made.
As an example:
1 kWp costs about 1000€ extra and produces around 1000 kWh per year, so the payback period at 8¢/kWh is about 12.5 years if you only feed the electricity into the grid.
If you use 20% of it yourself, the payback is already after 8 years. But you can adjust all the mentioned parameters according to your own situation to get an accurate result.
The IBC modules should have a 25-year warranty, if I am correct.
And with photovoltaics, you really do something for the environment by generating emission-free electricity.
Storage systems, on the other hand, only consume electricity themselves and just ensure that more electricity ends up with me instead of the neighbors, so initially, no one really benefits.
D
Dachshund9028 Sep 2023 21:23RotorMotor schrieb:
@Dachshund90 please describe your roof and the planned layout in more detail.
Then it’s easier to recommend what is worthwhile and what is not.
As an example:
1 kWp costs about 1000€ extra and generates around 1000 kWh per year, so the payback period at 8 cents/kWh is about 12.5 years if you only feed electricity into the grid.
If you use 20% of it yourself, it pays off after 8 years. But you can adjust all these parameters according to your own situation to get an accurate result.
The IBC modules should have a 25-year warranty, if I’m not mistaken.
And with photovoltaics, you really do something for the environment by generating emission-free electricity.
Storage systems, on the other hand, only consume electricity and just ensure that more stays with me instead of the neighbors; this doesn’t actually help anyone at first. Hi RotorMotor
The layout is not fixed yet. It was initially offered only for the southeast side, and upon my inquiry, it was also offered for the west side. I would arrange it a bit differently anyway. It is important for me to know how many modules to install and how many on each side.
Attached are a site plan and the layout proposals. North is at the top.
Best regards
RotorMotor schrieb:
The IBC modules should have a 25-year warranty, if I have seen it correctly.
For us, there is a 25-year product warranty and a 30-year performance warranty – I have to admit that I didn’t quite understand the exact difference.kati1337 schrieb:
We have a 25-year product warranty and a 30-year performance warranty – I have to admit, I’m not exactly sure what the difference is.
The product warranty covers defects that may occur during manufacturing.
The performance warranty guarantees that the output will not fall below 80% of the rated capacity during the 30 years. I believe the performance is expected to decrease by about 0.7% of the rated capacity per year.
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