Photovoltaic system: How many kWp are enough for a house?

  • Erstellt am 2020-03-19 09:10:33

guckuck2

2020-03-19 09:17:30
  • #1


Sufficient for what exactly?
To generate the same amount of electricity that the household consumes? - No.

Google PVGIS, then you can determine the expected yield of the system. I'll roughly say, oriented south and unshaded, you get about 900-1000 kWh per kWp of generator capacity per year. Roughly.
To your expected household electricity consumption of 4500 kWh, add the heat pump, let's say 3000 kWh.

Your offer is somewhat acceptable with a tendency to be expensive.
The question is, in the new building, what the solar installer intends to do at the meter cabinet or what is meant by the position.

Whether the allocation of North/East makes sense for you, they can also tell you there. The rules of stringing are not my forte, but with 5x360W facing north, not much will come out or the string could fail. But the experts over there know that much better.
 

nordanney

2020-03-19 09:20:08
  • #2
That way you still produce much more electricity than you need in summer. In winter, far too little. A battery won't help you with that either. But that's the case with almost every system, no matter how big. Tip: photovoltaics as guckuck2 wrote.
 

guckuck2

2020-03-19 09:30:13
  • #3


Ah ok, the reference to that has apparently fallen out of favor here.

Just google for a forum on the topic of photovoltaics.
 

Specki

2020-03-19 09:50:06
  • #4
The system as large as possible (and of course reasonable regarding northeast).
It’s not just about your electricity, it’s about the worldwide energy transition. And financially, it will (according to the current situation) be worthwhile for you as well.
This cannot be conveyed to you quickly here.

The costs are way too high for such a tiny system.
Fill the roof completely (as far as reasonable).
The environment and your wallet will thank you.
 

Daniel-Sp

2020-03-19 10:15:01
  • #5
My consumption: 150sqm without basement, no electric car, air-water heat pump indoor installation, 4 people. Window ventilation. Building envelope KfW 40, no controlled residential ventilation. Move-in 08.08.19. Meter reading yesterday 2619kWh for everything. You can see, electricity consumption is very individual to assess.
 

Zaba12

2020-03-19 10:39:19
  • #6

I do not deny anyone an individual electricity consumption, but concluding from an apartment to a single-family house, semi-detached house or end terrace house on the consumption + 1000kWh buffer may also be wrong.

For example, in the apartment (ground floor) we previously had a constant electricity consumption per year of 2500kWh without electric car (3 years ago). Now, of course, there are also permanent consumers, some larger, that simply were not there in the apartment before.
 

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