Photovoltaics initially without storage

  • Erstellt am 2017-03-02 09:49:21

toxicmolotof

2017-03-04 13:14:11
  • #1
We are basically rotated by 45°, no matter how you set up East-West.

Then with East/West you have the "advantage" that the curve becomes wider and flatter... at least in theory.

In practice, this is offset by a more expensive frame and a significantly more expensive inverter. In the end, it will never be worthwhile. If you are really interested, have two equally sized systems calculated, one facing south and one East-West.

East-West always delivers less yield at higher investment costs. And then it doesn't matter whether it's self-consumption or feed-in. Self-consumption does not make photovoltaics more profitable.

East-West systems with batteries are even more schizophrenic. At that point, I can only shake my head.

The only leverage an East-West system has is that you can get a larger system by using more modules (if space and budget allow) and thus lower the kWp/price.
 

Alex85

2017-03-04 13:39:04
  • #2
Hmn how exactly is the inverter supposed to become more expensive? For east/west you don’t need any special functions, right, or would shading have been an issue for you? You will also rack-mount to the south.



But yes. If I can buy 1 kWh from the public grid for 26 cents and instead consume a self-generated kWh from the roof with 4-5 cents VAT, this has a price advantage of 21 cents. If I instead feed this kWh in (currently 12.3 cents for new installations), the price advantage is reduced accordingly. Self-consumption is therefore a very important component in the profitability of a photovoltaic system.



I think it would probably depend on the system size, the storage capacity, and the usage behavior. But yes, generally, it makes little sense.
 

toxicmolotof

2017-03-04 14:37:12
  • #3
I don’t know how you produce your electricity, but my system doesn’t do it for free. The investment has to be paid. I produce the kWh for about 13 ob 0 ct, plus 4 ct VAT, making 16 ct. For feed-in, I’m at the same price.

And purchasing is also possible for 21 ct. Your calculation therefore reduces drastically. I therefore maintain that whether self-consumption or feed-in, currently it makes hardly any difference mathematically. Therefore, power yield maximization in the orientation and minimal investment costs apply.

Not taken into account is the possible taxation of the free-of-charge value transfer. But that also possibly applies to the feed-in remuneration. So I’ll just ignore it.

With east-west you definitely need an inverter that can convert two strings independently. With a pure south system, this is not necessarily required. East-west always delivers less yield without shading. And the east-west mounting costs more per module than south. At least that was the case here.
 

berny

2017-03-05 18:33:31
  • #4
Is such an inverter significantly more expensive than one for only one side of the roof? For me, it will probably be a southeast/southwest system... the house with a hipped roof must remain as it is.
 

toxicmolotof

2017-03-05 20:28:09
  • #5
If you compare 1:1, a few hundred euros. But that cannot be answered in general. The question is whether it makes sense to cover both sides of the roof.
 

berny

2017-03-06 20:02:49
  • #6
Yes, I probably will have to. The individual roof surfaces of this tent roof are only about 28 m2 each... would be too little for me with only one side coverage since I am building with a heat pump and want to "feed in" as much photovoltaic electricity as possible over the course of the year. In summer, it also cools.
 

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