Photovoltaics for self-consumption

Hello everyone

I am currently thinking about building a small solar system on the shed. The roof faces south and is only rotated a few degrees. So about 95 degrees towards the south.

I only want a small system to cover my electricity demand during the day. Unlike many other people, we also have a certain base load during the day. Because my girlfriend works from home and always has two monitors and her computer running. Additionally, of course, all the usual things. So lights, fridge, and so on.
Does it make sense to buy a 1000 Watt/h system in this situation? Or rather less. What do you think in general?

In general? Small systems are not worthwhile at all. To ever recoup the investment, you have to aim for a certain minimum size. It starts at 4 kWp, usually you aim for 7 kWp (above which a smart meter is mandatory) or 10 kWp (above which the Renewable Energy Act surcharge on self-consumption applies). The basic costs of the system due to inverters, wiring, etc. otherwise significantly exceed the cost of the generator itself or are disproportionate to it.

So I mean a complete package that would be sold for about 1100 to 1200 euros on eBay. They should deliver 1000 watts.

I do believe that these systems generally work. However, a few questions keep coming up:

-The inverters are single-phase and feed into a socket, but the electricity meter is three-phase; how is that supposed to work meaningfully? Consumers on the other phases, which is two-thirds, cannot take the electricity. Or can they? I am not an electrician.
-What is the quality of the output voltage?
-Does it really pay off, even considering the effort for pulling cables, etc.? I don’t think so!

For the system, you can also buy 4,000 kWh.

1000 Watt/h

Are you really an electronics technician?

Yes, I am an electrician. Unfortunately, more in plant engineering. I mean, I can connect it, but I just don't know anything about the subject. It always depends on the details here. As they say, the devil is in the details.

Consumers that are on the other phases, that is two thirds, cannot draw power. Or can they? I am not an electrician.

Since the three-phase meters sum over all three phases, the feed-in on one phase mathematically also benefits the other phases if the fed-in current is not completely "consumed" on the feed-in phase.