Photovoltaics initially without storage

Or a pool in the garden.... And then the energy consumption goes up from 30% to 60%.

I don't know why battery storage is talked about so negatively here. It always depends on the degree of self-sufficiency you want to achieve. Whether for ecological or economic reasons doesn't matter at first; basically, the battery offers you more possibilities to use the electricity produced rather than feeding it into the grid.

The storage systems are not being "bad-mouthed," they are simply not worth their current price. I now have several concrete offers for my system; depending on the model/provider, the cost per kWh extracted from the storage roughly ranges between €0.50 and €1.00. That is two to three times as much as you pay for grid electricity, depending on the provider’s tariff and usage type. I actually really wanted one of those devices, but no manufacturer guarantees more than 5,000 to 6,000 charging cycles, and if you make a real full cost calculation based on that, you can easily pay for 10 years’ worth of firewood for the fireplace from the extra expenses, massively lowering the electricity costs of the heat pump in winter by burning it, and still have a cozy flicker in the fireplace every evening from November to March. At least that way, burning money is fun! In any case, I have for the time being stepped back from the desire for storage; I am having the photovoltaic system prepared for a later retrofit and will wait about 5 years to see if the devices then come to market at reasonable prices. Only then will a decision be made. Such a photovoltaic system does not necessarily have to yield a profit, but it also doesn’t have to destroy money – and that is exactly what every storage system does at today’s prices.

I don't know why battery storage is spoken of so badly here. It always depends on the degree of self-sufficiency you want to achieve. Whether for ecological or economic reasons initially doesn't matter; fundamentally, the battery first of all offers you more options to use the electricity produced instead of feeding it into the grid.

If your funds are unlimited and therefore don't matter, that's true. Otherwise not.

Storage is unprofitable if no special constellations arise through subsidies. Thus, the only option is to see it as a hobby, and hobbies are allowed to cost money.

I don’t know why battery storage is spoken of so badly here.

They are not being spoken of badly. From an ecological perspective, they may (perhaps) be great. I do not dare to make an ecological assessment of saved [insert energy carrier of your choice here] against production costs (including mining of rare earths)...

But at the latest when you do an economic calculation based on real data, you will realize that every kWh from the storage costs you at least 40 cents. If the electricity from the grid is more expensive where you are, then the storage even makes economic sense.

If it is not, then it is probably not speaking badly.

Storage is unprofitable if no special constellations arise through subsidies.

Precisely the subsidies are unprofitable, the only ones who benefit are the banks. One commits to a limitation of the output power of the photovoltaic system, must have the proper commissioning certified, and above all must run the whole thing through a loan with the KfW, whose interest over the years eats up the repayment grant again.