Photovoltaic system offer for our single-family house

2022-07-27 09:41:07

Thank you both for the input. True, taxes on feeding in are missing. The consumption might actually be calculated optimistically, BUT the electricity price of €0.35 is too... I hardly believe that people will still be paying €0.35 in 10 years.

It's always somewhat a bet on the future. Of course, the calculation only with South makes the model more profitable, but I have also often read here in the forum that you should fully utilize the North as well, especially if you have an air-water heat pump.

By the way, PVGIS spits out just under 11,000 kWh for 10 kWp South and just under 7,400 kWh for 10 kWp North...

2022-07-27 09:59:16

Electricity price at €0.35 as well... I hardly believe that in 10 years people will still be paying €0.35.

Well, unfortunately no one can say.
If I look at the electricity prices in neighboring countries, I wouldn’t be so sure that prices in Germany will rise significantly.
But who knows. ;-)

It’s always somewhat of a bet on the future. Sure, the calculation only makes the model more profitable with south orientation, but I’ve also read here in the forum many times that you should fully use north, especially if you have an air-to-water heat pump.

You can/should fully use north on a flat roof.
So up to about 20 degrees. And the recommendation comes from a time when 1 kWp cost €1000.

By the way, PVGIS spits out just under 11,000 kWh for 10 kWp south and just under 7,400 kWh for 10 kWp north...

Ah, then you must be quite far south.

But with over 30% less yield, at currently around 50% increased prices (+ effort for the mounting), profitability is hard to achieve...
And the material would be better placed on the neighbors’ south roof as well. ;-)

2022-07-27 10:03:41

Well, unfortunately no one can say.
If I look at the electricity prices in neighboring countries, I wouldn't be so sure that the price in Germany will rise significantly.
But who knows. ;-)

You should/can fully utilize the north side on a flat roof.
So up to about 20 degrees. And the recommendation comes from a time when one kWp cost 1000€.

Ah, then you are coming from quite far south.

But with over 30% less yield, at the currently about 50% increased prices (+ effort for mounting), profitability is hardly given...
And the material would be better placed on a south roof of the neighbors as well. ;-)

I understand your points. So you wouldn't do north at all given the price? Previously there was always the argument about bypassing the 70% cap, which has now also been removed from 01.01.2023...

Would another option be that I leave it at 10 kWp in the south and just do 3-5 kWp in the north and run it all through a single inverter, instead of 2 like currently offered?

2022-07-27 10:12:35

I understand your points. So you wouldn’t do North at all at that price? Previously there was always the argument about bypassing the 70% cutoff, which has also been eliminated as of 01.01.2023...

Exactly, so that doesn’t make sense anymore.

Would another option be that I leave it at 10 kWp in the South and just do 3-5 kWp in the North, and run it all through a single inverter instead of two as currently in the offer?

No, that doesn’t help either because the string then doesn’t reach the appropriate voltage. My opinion would be to do only South, and when prices and the market have calmed down, you can still do North. Since it’s basically two systems with two inverters anyway, etc., there’s no point in doing it now at the inflated prices. Do you have another garage, a carport, a terrace roof that could be fitted?

2022-07-27 10:17:46

Why actually orient north? Isn't flatter = better? Or are the 21 degrees the optimum that PVGIS outputs? North then also significantly increases self-sufficiency for half the year. You have to calculate exactly. Best with the professionals. Or "ours" can give his two cents, ;)

2022-07-27 10:32:54

Why actually tilt north? Isn't flatter = better there?

We are talking about north. Tilting from 25 to 20 is a way one can go.
I'm not so sure if that makes sense. But I am sure that shadows are cast there.
Has the solar installer simulated that?
So that in PVGIS the yield looks higher, but in reality is then significantly lower.

North then significantly increases self-sufficiency for half the year.
You have to calculate exactly. Best with the professionals.
Or "ours" gives his two cents, ;)

Whether it is significant is another question. ;-)
Especially in winter, the low sun does not hit the north modules.

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Photovoltaic system offer for our single-family house

Elias_dee

RotorMotor

Elias_dee

RotorMotor

KingJulien

RotorMotor