Photovoltaic system on a single-family house

Hello everyone,

I have a few questions about photovoltaics again.

The system we are planning would go into operation in 2012. The capacity will be around 8-10 kW, thus falling into the category "up to 30 kW."

According to the feed-in tariff (Renewable Energy Sources Act 2012), we then get:

24.43 cents per kWh

and

8.05 cents per kWh for self-consumption, provided self-consumption does not exceed 30% of the capacity

and

12.43 cents per kWh for self-consumption, provided self-consumption is above 30%.

[HTML]

---

[/HTML]

Now the first question:

The feed-in tariff has decreased significantly over the years. Therefore, the self-consumption part is much more interesting for me.

Do I understand correctly that I get 8.05 or 12.43 cents for every kWh that I consume myself? If yes, then for my calculation I can assume that I can use the electricity supplier's consumption price plus the above amounts?

Assumed electricity supplier price: 20 cents per kWh

=> Saving 20 cents + self-consumption tariff

If this is correct, then of course I have a heightened interest in consuming as much electricity myself as possible.

Which probably also means that I will need batteries as a result.

How large would you dimension a reasonable battery capacity?

And can the power then also be used for things like watching TV in the summer months, so that I can achieve a high self-consumption rate during the period of greatest electricity generation?

Thank you very much for the information and best regards Ostsee

Hello,

....If this is correct, then of course I have an increased interest in consuming as much electricity as possible myself.

That’s right!

....Which in turn probably means that I need batteries.

Definitely not, because that would shift the disadvantages of storage onto the private user! Immediate consumption is required here, i.e. heating and hot water with a heat pump. Anyone who is somewhat clever sets, for example, the hot water charging to the period of highest photovoltaic yield. That of course requires a suitable system configuration (heating/hot water).

...And can the power then also be used for things like watching TV during the summer months, so that one can achieve a high own consumption rate in the period of greatest electricity generation?

That is possible, but the results are usually sobering!

Best regards

What disadvantages do I have with storage? And is there possibly some kind of compromise solution?

What disadvantages do I have with storage? And is there perhaps some kind of compromise solution?

Disadvantages of individual (private) storage are always present. It does not matter whether thermal, electrical, or pneumatic, storage is always subject to losses. Therefore, it is always a computational advantage if one is not privately burdened by this. Photovoltaics => sale surplus / purchase demand! The difference is financed by the solidarity community in photovoltaics! ;-) Best regards

Hello Baltic Sea

Your calculation and consideration are basically correct. The question is only, when do you consume electricity?
In my opinion, the self-consumption regulation is worthwhile for kindergartens / schools / public institutions / small industrial companies etc.
In private households, it is only worthwhile if electricity is truly consumed during the day. That means if one of you works from home (office in the house), if one of you stays home with the children all day and cooks, does laundry, etc.
If you both go to work, the children are at school in the morning and at friends', sports, etc. in the afternoon, then it probably won’t be worthwhile...
You would simply have to observe your consumption for a while.

Electricity storage is not worthwhile at all yet. Acquisition / maintenance etc. are much more expensive than the "profit" you can get from it. Wait another 10 years, then you can reconsider :)

Regards
Micha :cool:

hello you, then it wouldn't be so bad if we used our photovoltaic electricity for the geothermal heat pump, right??