Balcony power plant – with storage or without? Orientation?

  • Erstellt am 2025-07-10 10:01:27

wiltshire

2025-07-11 11:13:13
  • #1

That makes sense if the battery unit has the trackers.
This gives you a maximum charging power determined by the modules and a maximum discharging power determined by the inverter, allowing you to sensibly influence the number of cycles and thus the profitability, since the modules themselves are "cheap". That seems reasonable.


Larger than a balcony: yes, roof: yes, large with 9.99 kWp: no.

Here, recharge demand and storage dimensioning count. If the car empties the battery and then electricity has to be bought for the base load, nothing is gained.
Specifically for us: we have an 8 kWh storage with 8 kW charging-discharging power. Without a connected car, a full battery in summer is sufficient for the yield-free period between the last and first sun rays. Anything more needed in this period must be purchased. Whether I buy the electricity for the car or the house makes no difference here, since overnight it remains one cycle. I could consider expanding the storage.

For us: it depends on when charging actually happens. That may seem dialectical at first glance, but it is a rather fundamental difference. I will not start educating others to save a few euros on electricity.
 

hanse987

2025-07-11 14:37:16
  • #2
With a BKW, I would keep it very simple. Mount, turn on, and let it run alongside without much attention.
 

Neuer von Da

2025-07-11 16:35:58
  • #3


That's how I did it too, although we've already given away 400 kWh since October... Our consumption is just too low.

And the 2-4 kWh/day that we still draw from the grid in summer doesn't make much of a difference.
 

hanse987

2025-07-11 17:03:30
  • #4

At my parents' place it's about 150kWh since January. There is one module each on the shed roof facing east and west. Less peak yield at noon, but nicely distributed over the day.
 

Yosan

2025-07-12 01:36:54
  • #5
We have also had a balcony power plant for about a year now, and I have already considered whether a storage system makes sense. However, I simply don't know enough about it. When the sun shines and it reaches the photovoltaic system late in the morning, the electricity is enough for all continuous users plus possibly something else... either dishwasher or washing machine (depending on the stage of the washing/rinsing cycle at least) or home office. As soon as several of these things occur simultaneously, however, the photovoltaic system is no longer sufficient. In the meantime, we have adjusted our rhythm somewhat so that the washing machine or dishwasher actually run during the day rather than in the evening.
 

SteffenBank

2025-07-14 07:42:50
  • #6
Whether a storage system makes sense with a BKW or not is something everyone has to decide for themselves. If you only have 2 panels, it doesn’t make sense if you control your consumers so that you use the 800 watts. But if you take 4 panels and are close to 2kW, then it does make sense. Use 800 watts and charge the storage with the rest and then use it when the sun is gone. How quickly the additional panels + the storage pay off is, of course, another matter.
 

Similar topics
13.07.2016Photovoltaic storage - experiences? Tips?17
10.10.2017New photovoltaic system with storage in single-family home - experiences39
17.05.2017Photovoltaics initially without storage54
20.10.2017Roof with photovoltaic or other investment, any experiences?19
06.02.2018Solar for hot water/heating or better photovoltaic for electricity?21
05.03.2018Photovoltaic planning - possible retrofitting of battery storage13
22.01.2019Photovoltaic system Your yield in the year 201821
07.05.2020Collaboration of air-water heat pump, photovoltaic system, and storage38
05.05.2020Photovoltaic system + storage with or without cloud tariff13
08.05.2020Heat pump + photovoltaic system with or without storage11
15.12.2022Electricity consumption at home, what is your consumption?418
09.11.2020Lower Saxony subsidizes photovoltaic storage20
07.11.2021Newly built single-family house - gas or air heat pump + photovoltaics + storage?168
16.07.2021Cost of photovoltaics with storage120
28.03.2022Photovoltaics are coming up - Options: 19 kWp, 25 kWp, 30 kWp, Storage?30
06.08.2022Savings photovoltaic system, storage, power cloud41
19.09.2023Evaluate offer, photovoltaic system technology86
17.10.2023Evaluation of Photovoltaic System Offer with Storage78
27.09.2024Offer for photovoltaic system including storage - Storage yes/no?44
06.01.2025Is the photovoltaic price okay? 10.2 kWp and 5 kWh storage14

Oben