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
R
RotorMotor26 Sep 2023 17:49kati1337 schrieb:
What would be a typical value?
I might have overestimated a bit; I only looked at one night as an example. I think 350–400 is more realistic. It’s not that easy to determine a "typical value."
But with 400W, you’re using as much as a family of four.
However, for you, that’s just the base load. Others use that amount for their entire electricity consumption including cooking, washing, gaming, and so on.
To compare, we’re at about 250W.
And even that I (unfortunately) consider quite high, since we’ve accumulated a lot of equipment like two refrigerators, a fully loaded 24-port managed switch, server, NAS, several access points, cameras, ventilation system, smart home, ...
kati1337 schrieb:
But the ventilation system probably also uses a lot. I’m still missing the network connection for it; it’s possible that it’s running at full power day and night without switching to a lower setting. What kind of device is it, and on which setting?
W
WilderSueden26 Sep 2023 19:54I find 350-400W really high. That’s about 10 kWh of base load per day. Without major appliances, we typically run around 150W, which usually includes a laptop running.
WilderSueden schrieb:
350-400W seems really high to me. That’s about 10 kWh per day of baseline consumption. Without major consumers, we typically run around 150W, but that usually includes a laptop running. With a ventilation system and air-to-water heat pump?
RotorMotor schrieb:
What kind of device and at what setting is it running? Vallox 350 MV. I can’t currently tell you which setting it’s on. Besides the small display on the unit, we don’t have any further access yet. It runs in the “present” mode, that much I know. But whether it lowers to a reduced setting at night like our old one did, I can’t say.
W
WilderSueden26 Sep 2023 20:14kati1337 schrieb:
With a ventilation system and an air-to-water heat pump?With fans. When hot water is produced, I count that as a major consumer. But it should also be noted that we used to consume about 800 kWh per year in the apartment before.B
Buchsbaum26 Sep 2023 21:56Let me add my two cents as well.
I have a 7.2 kWp system with a 10 kW battery storage using a Huawei setup. I am very satisfied with it. It has been running flawlessly for over a year. I designed and built the system myself. Last year, the total cost including the battery storage, with VAT included, was just under 10,000 euros.
The system size fits my consumption almost perfectly. I’m very glad I decided to include a battery. Since March, I haven’t used any electricity from the grid. Previously, my electricity consumption, including electric water heating, was around 5,000 kWh. Now, over one year, I have a winter consumption of only 1,500 kWh, which is exactly what I estimated.
Still, I feed a bit more than 2,000 kWh back into the grid, mostly unintended. That is the surplus power from the photovoltaic system. Because my system faces south, the battery covers my electricity needs completely from 5:00 pm to 9:00 am. Without the battery, I would feed more energy into the grid but also draw more from it. The goal, of course, should be to minimize grid dependence as much as possible.
Currently, my battery discharges about 60 to 70 percent. The days are getting shorter. It will last until early November, then I’ll have to start drawing from the grid again. In December and January, I expect zero photovoltaic output. During the period of highest electricity consumption, solar production is at its lowest.
In summer, a daily yield of about 40 kWh is realistic, around Christmas 1 to 2 kWh.
Don’t skimp on the battery—you’ll regret it. There’s nothing worse than having a photovoltaic system on the roof and watching the electricity meter start to run backwards. Like this August, when it rained for weeks, the system barely managed to charge the battery. That’s when I really appreciated having one.
But in the end, everyone can do as they please. I don’t care about all the nonsense that says a battery doesn’t pay off. My system is paid off, and my bank account is 5,000 euros smaller. So what? The battery doesn’t eat bread. I’m very happy with it.
I have a 7.2 kWp system with a 10 kW battery storage using a Huawei setup. I am very satisfied with it. It has been running flawlessly for over a year. I designed and built the system myself. Last year, the total cost including the battery storage, with VAT included, was just under 10,000 euros.
The system size fits my consumption almost perfectly. I’m very glad I decided to include a battery. Since March, I haven’t used any electricity from the grid. Previously, my electricity consumption, including electric water heating, was around 5,000 kWh. Now, over one year, I have a winter consumption of only 1,500 kWh, which is exactly what I estimated.
Still, I feed a bit more than 2,000 kWh back into the grid, mostly unintended. That is the surplus power from the photovoltaic system. Because my system faces south, the battery covers my electricity needs completely from 5:00 pm to 9:00 am. Without the battery, I would feed more energy into the grid but also draw more from it. The goal, of course, should be to minimize grid dependence as much as possible.
Currently, my battery discharges about 60 to 70 percent. The days are getting shorter. It will last until early November, then I’ll have to start drawing from the grid again. In December and January, I expect zero photovoltaic output. During the period of highest electricity consumption, solar production is at its lowest.
In summer, a daily yield of about 40 kWh is realistic, around Christmas 1 to 2 kWh.
Don’t skimp on the battery—you’ll regret it. There’s nothing worse than having a photovoltaic system on the roof and watching the electricity meter start to run backwards. Like this August, when it rained for weeks, the system barely managed to charge the battery. That’s when I really appreciated having one.
But in the end, everyone can do as they please. I don’t care about all the nonsense that says a battery doesn’t pay off. My system is paid off, and my bank account is 5,000 euros smaller. So what? The battery doesn’t eat bread. I’m very happy with it.
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