Introduction to Photovoltaics (New Construction)

  • Erstellt am 2016-11-22 18:22:27

jeti79

2016-11-22 18:22:27
  • #1
Hello everyone,

I have tried to read up on the topic of photovoltaics but have so far barely gotten beyond very optimistic (Google) advertising offers. Here in the forum, I have mainly read critical (mostly older) posts.

About my concern:
We are currently planning a (gable roof) new building for early 2017 with south/east and north/west orientation and have so far followed the classic concept of gas condensing boiler/solar thermal with water storage. Through a colleague, I became aware of the topic of photovoltaics. When he told me that he can (theoretically) generate 3500 kWh/year with a system he bought for €7000 about 3 years ago (but without storage), I became curious.

I would like to know how realistic it is to achieve such a performance with an investment of about €10,000 and to use it completely independently? Currently, we live (3 people) in an apartment and consume about 3800 kWh/year. Of course, I quickly dismissed the idea of the "quick market"...

If at all remotely possible, I would appreciate literature/prices for such an undertaking.
 

RobsonMKK

2016-11-22 19:01:30
  • #2
So, the topic comes up about every week. Always with the same result: if you don’t have certain consumers that run exclusively during the day, you will never use all the electricity yourself. And in the evening you will always buy electricity from the grid.
 

jeti79

2016-11-22 19:12:51
  • #3


Thank you for your answer - so far, that's how I have read most of it as well, but if I remember correctly, there was rarely any mention of storage. I completely lack the reference to the possibility of storing the electricity and using it myself.

Feeding into the grid is not really interesting to me so far (alone because of the bureaucracy...).
 

Alex85

2016-11-22 19:50:02
  • #4


Apart from the proportionate self-consumption, however, the only sensible option. 100% self-sufficiency is not possible even with the available power storage systems and economically completely absurd.
 

jeti79

2016-11-22 19:57:36
  • #5
Ok, I see that I have not yet understood the matter. So I have little choice but to inquire at an installation company in the area? 100% autonomy probably cannot be achieved at the moment either - I had the illusion that I could drastically reduce my electricity costs (also by charging a storage system).
 

Alex85

2016-11-22 20:00:05
  • #6
You can reduce your electricity costs. You can also produce 3500 kWh of electricity, even with the desired investment of €10,000 (or even more). The question will be whether it is worthwhile. And you have excluded an essential constraint, namely dealing with taxes and the like, because without those or the feed-in it simply doesn't work. Just google photovoltaics and forum and read up.
 

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