Construction costs are currently skyrocketing

What do I have to enter on Google to find the shop? I only found the palette at least 1k more expensive than advertised

For the exact offer, you probably had to ask Durran ;-) But you regularly find deals on the common bargain portals/blogs. The price trend is clearly downward, but it just doesn't say SMA or LG on it.

Not everyone knows how to google properly.

I like the Trina Vertex S modules in Black and have used them so far. They are not the cheapest but very good modules.
There are also cheaper ones.

The lowest price per module when buying a pallet (36 pieces) would be 139 euros. By the way, on ebay Kleinanzeigen. I would like to link it, but I am not allowed to. A Huawei inverter, which I have also installed myself, costs 2350 euros with 30 kW output.

The Schletter rails have become more expensive. However, you could still switch to cheaper rails here.

All in all, for self-construction including scaffolding (calculated with 1000 €) for a photovoltaic system with 30 kWp, I come to a tightly calculated price of 620 euros per 1 kWp. Or a total of 18,500 euros.

It has never been cheaper.

With 10.9 cents Renewable Energy Act remuneration as a full feed-in, I can expect a return of 15 percent here. That would be well-invested money.

In 2014, I bought a barn. 885 sqm designated and developed residential land with an existing barn.
The roof area has about a 45-degree pitch and is unshaded facing south. 10 x 25 m per roof side. So it would be perfect for such a system.

By the way, bought back then for 1200 euros including notary costs. Nobody wanted it at the time. A tax-free sale would be possible here in 2024.

You can believe me, I can't keep up with the salaries paid here. But I think I get along quite well with my 1500 euros. I feel like I have more than some here with four times the income.

Dear interested party,

we offer you photovoltaic modules from the well-known manufacturer "Trina Solar". The modules offered are from the series "Trina Vertex S" with a power output of 420 watts (TSM-420 DE09R.08).

Prices:
Palette – 36 pieces: €138.86 / module – €4999 per palette
Single purchase: €149.00 / module

It is listed like this on [ebay kleinanzeigen]. You can check it yourself.

Dear interested party,

we offer you here photovoltaic modules from the renowned manufacturer "Trina Solar". The modules offered are from the "Trina Vertex S" series with a power of 420 watts (TSM-420 DE09R.08).

Prices:
Palette – 36 pieces: €138.86 / module – €4999 per palette
Single purchase: €149.00 / module

It says so on eBay Kleinanzeigen. You can check it yourself.

The ad ID is 622199.

If people who invest hundreds of thousands of euros can’t even find a suitable offer on the classifieds portal, dismiss and question every one of my statements as untrue, then they can also search for themselves.

The problem is not the heat pump or the photovoltaic system. The problem is the power grids. Outdated like almost everything else. And at some point, they started laying aluminum cables up to the house connections. They can no longer conduct the future loads.

At least we have now equipped large parts of the country with fiber optic cables. Thousands of kilometers of roads torn up, cables laid, and closed again. But to be clever enough to lay new and better power cables at the same time, no. They don’t think that far here. Everything is rather done five times than installing a conduit once.

The local power grids can hardly support electric vehicles and only a limited number of heat pumps.

When all heat pumps in a new housing development start up at -5 degrees and every second person is charging their electric car with 11 or even 22 kW and mom still has a roast in the oven, the capacity is no longer sufficient. And photovoltaic systems don’t help in the evening at 8:00 p.m. either.

It can and will not work. And this is not my idea but from conversations with technicians who work on the power grids.

to present and question every one of my statements as untrue,

95% is just babble, neither I nor the others can do anything about that ;) Or do you have the fifth nickname by now just for fun?