Photovoltaic system: Advantages and disadvantages, experiences, worthwhile?

There is also the small business regulation, where you don’t have to do that.

But then you also don’t get the paid VAT back when purchasing. And you need a large electricity production in the first years to make that up again.

I would buy my system again and again. I generate 50% of the total electricity required myself, the rest goes away... the system paid off after 7 years. I am very satisfied.

How do you manage 50% self-consumption without a battery?

Taxation means to me that I have to pay money on the generated electricity, even though I could use it "for free" for my own consumption without having to buy any from the supplier. Then I would be taxing the self-generated electricity, that is, paying money on top and then paying twice because I still have to purchase some. I probably don't know enough about it. Maybe it makes sense here to have another conversation with the architect and energy consultant.

You have to see the whole thing as a company, since the photovoltaic system is operated as such. If you take something out of the company for private use, then it must be taxed.

A comparable example is the private use of a company car by an entrepreneur. If the entrepreneur uses the vehicle 70% for business and 30% privately according to the logbook, but deducts all costs and recovers the entire input VAT from the tax office, then the entrepreneur benefits from the vehicle privately. Therefore, he must tax the self-consumption to the extent of 30%.

But then you also don't get the paid VAT back when you buy. And you really need a large electricity production in the first years to get that back.

After 6 years you can switch. Basically, the difference is now so small that you might as well save yourself all the hassle with the tax office for the few euros saved.

6.24kWp My former schoolmate has a company that designed the system for me. I bought the materials there. He said you don't necessarily need more, the size is absolutely sufficient in terms of price/performance... you can always go bigger, but the wallet has to cooperate.

The recommendation is always as large as possible and without storage, as it pays off faster. Common up to 9.9kWp and then from about 13kWp. But with EL you don't have to worry about that anyway.

Getting 20% of the costs reimbursed on the first day, I do not see as a "such a small difference"