ᐅ Accept an offer for a 16 kWp photovoltaic system at this time?

Created on: 14 Dec 2022 20:27

I need your opinion on the following offer for a photovoltaic system.

Gable roof with a 23-degree pitch, fully covered on both sides with a total of 40 modules, approximately 16-17 kWp, depending on the modules available at that time.
Southwest orientation, no shading.
No battery storage.
Includes all installation work, scaffolding, connection, and registration: 28,000 net.
House details: Single-family home, 135 sqm (1,452 sq ft), KfW 55 standard, air-to-water heat pump, controlled ventilation system, 3 occupants, aquarium, possible electric car in 2 years. Estimated annual electricity consumption: 8,000 kWh.

kbt0931 Dec 2022 20:55

#31

@i_b_n_a_n .. starting in May, the lines for "self-consumption" and "grid feed-in" no longer seem to match the "generation" line .. or am I seeing things? But overall, these are nice values 🙂

i_b_n_a_n31 Dec 2022 21:01

#32

Hi, these are the values directly read from the RCT. What exactly do you think doesn’t match? (I have a small 4 kWh (4.4 kWh) battery, so maybe the losses there combined with the inverter losses slightly distort the values, but roughly the mEA matches?)

kbt0931 Dec 2022 21:03

#33

In the first 4 months, the values for "self-consumption" and "grid feed-in" always add up to the value for "generation." After that, the generation is always somewhat higher than the two individual values combined, by about 10% or so… I just happened to notice.

KingJulien31 Dec 2022 21:51

#34

PV accounting table with generation, feed-in, direct consumption, and self-sufficiency

Here’s my input in Excel for when words are not enough.
23 kWp – December ’22 had almost 2 weeks of snow on the roof – no BEV yet.
Heat pump consumption: 1960 kWh, including hot water.
So, I hope statements like “December + January yield = nothing” and “more than 5% self-sufficiency isn’t possible” can be put aside as just casual talk, at least when the roof has been used sensibly.

Oh, and Happy New Year! 🙂

Pitiglianio31 Dec 2022 22:13

#35

KingJulien schrieb:

So, here’s my input in Excel

Thanks to everyone for the numbers and facts.
I used your figures. According to your data, calculated over 12 months, with estimated electricity costs of 40¢/kWh, you save 1266 euros annually. In addition, with a feed-in tariff of 7.5¢, you have an income of 1500 euros per year. That adds up to 2766 euros annually. Or am I missing something? Have a great start to the new year.

KingJulien31 Dec 2022 22:40

#36

I’m not going to double-check the calculations now, but it’s probably correct 😉

ᐅ Accept an offer for a 16 kWp photovoltaic system at this time?

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