Is a solar power system worth it for us?

I always thought solar systems are for hot water?

Yes, yes, the terminology, solar thermal systems and photovoltaic systems are different implementations of solar systems...

But travel, scaffolding?, electrician...costs are the same for 5 kWp as for 10 kWp, and labor hours around Munich are expensive.

The ancillary costs make small systems unprofitable. That’s true. But the provider can also come from the provinces – in my case, he came from Aue in Saxony ==> trip all the way to the Lower Rhine.

The additional costs make small systems unprofitable. That is true. But the provider can also come from the provinces - in my case, he came from Aue in Saxony ==> trip all the way to the Lower Rhine.

Can you tell me who that is?

Get a better offer and the invoice will be correct. What is the roof orientation? You achieve more self-consumption with an east-west system than with a south-facing one.

With the same photovoltaic area and inclination?

We installed a photovoltaic system, 4.55 kWp (by the way, we paid about the same price as you did, back then we weren't yet part of this forum :rolleyes:) ...
We would do it again, besides all the rational calculations (which still make sense), the fun factor shouldn’t be underestimated. I never thought my husband would develop the hobby of “shoving the photovoltaic app under everyone’s nose.” ;)
We are lucky to work from home and always cheerfully sprint to the dishwasher and washing machine when the sun comes out.
But even if you are out during the day, you can optimize something. Many washing machines can be scheduled, just set it to “in 4 hours” when you leave the house in the morning. Or with smart plugs (unfortunately quite expensive) you can control it even more directly. You also have good synergy with a heat pump.
Of course, it won’t help you much in the really cold months – in deep winter, your yield is very low. But the two transitional seasons in spring and autumn should not be underestimated. There you have several months where you are already heating and still get sun during the day. Heat pumps can also be set so that their inverter starts happen more during the day and not at night – someone once advised me to just lower the target temperature by 1°C at night – I haven’t dared to try that yet.
Then there is also the standby background noise, your fridge, your freezer, and whatever else might consume electricity while you are out.

In short: In our calculation, we planned for a self-consumption rate of 35% (with an air-water heat pump). Now from January to May, we are at 53%, in May so far 55%, although the air-water heat pump no longer heats continuously because it has gotten warmer. In January and February, when it was really cold, we were at 70% and 60%.

Furthermore, we have already saved nearly 1 ton of CO2 and about €250 in electricity costs since the end of January.
I love the thing and only regret two things: that we paid so much for it, and that we didn’t get a bigger one. I think we’ll add more during the next high liquidity phase.

Then there is the standby baseline noise, your refrigerator, your freezer, and whatever else might use electricity while you are out of the house.

I don’t have photovoltaics, but my neighbor swears by the SuperFrost function on his Miele freezer: the device cools down for 6 hours at maximum power for planned storage of non-frozen goods—and if nothing is stored after all, the device is so cold that it practically uses no electricity for the next 36 hours... so just press the turbo button on a full clear-sky morning and the device roughly stores 1 kWh. Nice to have :)