Photovoltaic - Position on the roof and only one meter?

  • Erstellt am 2024-09-12 09:59:57

Nida35a

2024-09-12 12:01:30
  • #1
Is the south side with the 10 kwp already full? For household, heat pump, and car, that is only sufficient in summer; in spring and autumn, there is not much left for the car. From March until now, we have only taken 22 kWh from the grid.
 

Pete1909

2024-09-17 20:42:22
  • #2
Unfortunately, my house is not yet on the map of the proposed calculator (as of 2022).

I will go with one meter :-)

But another question arises for me:

Instead of 22 modules, I could now go for 24 modules with 455 each heat pump. (then approx. 11 kWp)

With the orientation of the house, as can be seen in the picture above -> Does it make sense to place, for example, 3 rows of 6 modules on the "south side" and 2 rows of 3 modules on the back?
Already from 3 pm today we had full sun on the other side until the evening..

Or is it better to fully place on the side that has full irradiation between 8/9 am and 3 pm?

I am still undecided.

As of now, it should not be expanded with more modules.

 

Nida35a

2024-09-30 10:22:09
  • #3

In winter this is reduced to 3-4 PM, not worth it.
The yield today and Saturday with sauna (yellow-photovoltaics, black-consumption, green-storage)
 

Pete1909

2024-09-30 10:35:55
  • #4
Will put everything on the front, with a roof slope of 38 degrees we would only have 65% efficiency on the rear roof side compared to nearly 96% on the front. Your comment supports this even more, thank you!
 

Evolith

2024-10-02 09:19:24
  • #5
A cascade circuit makes sense when the electricity price difference is large enough. I think I once read 10 cents. The base price is not insignificant either. We have a cascade circuit. We pay 17 cents for the heat pump and 27 cents for household electricity. That pays off quickly because the additional consumption in winter is significantly with the heat pump. Our photovoltaic system then only supplies the standby power of the house. In our case, it is cascaded so that household electricity is served first and then the heat pump.
 

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