Balcony power plant – with storage or without? Orientation?

  • Erstellt am 2025-07-10 10:01:27

wiltshire

2025-07-10 15:05:29
  • #1
I once looked at such a Growatt NOAH 2000 on the internet. You are right, it formally meets the conditions. The price is around 500€ per kWh of storage capacity. If you assume a (here arbitrarily chosen) price advantage of 25ct/kWh, you need 2000 cycles to achieve amortization. That will probably take a while.
 

HubiTrubi40

2025-07-10 21:53:35
  • #2
I'm not really that sure about the memory now either. Basically, there would be nothing against buying it later on, right? Well, then you would just have the problem that you would have to convert from direct current to alternating current twice, which leads to higher loss. Or am I thinking wrong?
 

wiltshire

2025-07-11 09:03:21
  • #3

With an AC-coupled storage, you convert AC/DC once to store and DC/AC to use again. You can generally assume converter losses of 4% per direction and storage loss of 2%. That makes about 10% loss. Maybe it's also 12%. If this magnitude endangers profitability: don’t buy.
 

Nida35a

2025-07-11 09:15:49
  • #4

Then balcony power plant without storage now, to take a bit off the base load.
Later do something proper with photovoltaics and storage, now regularly write down the meter readings to be able to determine your consumption profile more precisely.
Consider whether a heat pump, e-car, sauna, pool heating, etc. are planned.
 

Musketier

2025-07-11 09:29:27
  • #5
A storage system for a balcony power plant is clearly more cost-effective than for a large rooftop system, as you are likely to have significantly more charge and discharge cycles (possibly also intra-day) than with a large system and probably do not receive any feed-in tariff.

With my 13kWh system, since the end of March, there has not been a single day where the smallest possible storage for my system was fully discharged. I only use 2-3kWh overnight daily. On average, this means over the period from April to September not even one charge cycle every 2-3 days. In the 3 winter months, there isn’t much, so you don’t accumulate cycles, which makes me wonder when you are supposed to reach the 220-250 charge cycles per year from the manufacturer’s calculations. However, this is connected with time-optimizing major consumers to periods of surplus. Of course, it would be more convenient with storage. On the other hand, if you also have a large base load at night, then it pays off significantly more.
 

wiltshire

2025-07-11 09:51:00
  • #6
Yes, because you do not receive a feed-in tariff, every stored kWh from a balcony system has a higher value. The number of cycles results from the usage profile. Of course, future plans and price developments can be anticipated in the usage profile, but I consider that crystal ball gazing. There are often incorrect assumptions, for example that the use of an electric car would increase the number of cycles. That is the case if the vehicle is charged in the morning, when the battery is already filled once, "emptied", and can be charged again on the same day. Our electric car is used by 3 people – it is the preferred vehicle for trips up to 100 km. So that everyone can leave at any time, it is recharged at home when exiting. This is not cost-optimized but maximizes spontaneous availability and avoids additional arrangements. The number of cycles of the home storage has decreased significantly since we have the electric vehicle.
 

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