Balcony power plant – with storage or without? Orientation?

  • Erstellt am 2025-07-10 10:01:27

SteffenBank

2025-07-11 09:58:50
  • #1
I have a system with 4 panels (total 1700 watts) and a Growatt Noah 2000 and 600W inverter. On good days, I consume between 8-9kWh of electricity from this combination. The system is designed for zero feed-in, a Shelly 3 EM controls the storage. So I think the storage is definitely worth it.
 

wiltshire

2025-07-11 10:27:34
  • #2
How is it prevented that the inverter gets overloaded?
 

Musketier

2025-07-11 10:28:56
  • #3
I suspect you also have a large system on the roof.
On sunny days with clouds, the yield fluctuates enormously during the day. This does not matter with a large system because you still stay above the base load. With a small balcony power plant, I could imagine that without a storage unit you would fluctuate between consumption and surplus during the day, thereby increasing the number of cycles.

It depends on when charging can take place. If it happens during the day, e.g., on [HO]-days, the car itself acts as a storage. This is of course optimal because the electricity is used when it is generated and fewer conversion losses occur. The number of cycles for the storage decreases as a result.
If one regularly arrives home only in the evening and drains the fully charged storage again, the number of cycles would increase instead. While this has a positive effect on the calculation for or against the storage, overall the total consumption is higher due to the additional conversion losses.

I currently mostly charge my hybrid on [HO] days as well. With storage, I could charge in the evening, and my wife could use it on my [HO] days. With two electric vehicles/hybrids, however, it does not matter, because then charging can be done on weekends or on [HO] days. It’s all very individual, and the demand will also change within the amortization period of photovoltaic systems/storages.
For example, I already assume that we will eventually operate both vehicles electrically. Possibly, a third vehicle from the child will be added for a while as well.



 

SteffenBank

2025-07-11 10:34:04
  • #4

That cannot happen because the modules are connected to the storage and the storage to the inverter. The storage behaves like solar modules for the inverter. Maximum output power of the storage is 800 watts.
Soon I will replace my inverter with an 800-watt one. Then I can use the system even more efficiently.
 

HubiTrubi40

2025-07-11 10:55:23
  • #5
My wife is at home during the day. She cooks and the washing machine runs sometimes. Then the question is anyway whether the electricity from the [Balkonkraftwerk] is sufficient to fill a small storage for the evening.
 

SteffenBank

2025-07-11 10:58:32
  • #6
Then it will be difficult with 2 modules. With 4 modules, however, he would still be able to fully cover it in good weather, since you are allowed to feed a maximum of 800 watts into the house. The rest is then for charging the storage.
 

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