Help with photovoltaic decision

For a few years now, I have had a storage system with 8kWh capacity and up to 8kW charging and discharging power in the house. I get about 270 cycles per year. That amounts to 2160kWh mathematically. With a difference of 20ct between feed-in tariff and electricity price, that would be a benefit of 432€ p.a.. I could economically use somewhat more storage with our usage profile. Friends have a 10kWh storage system with 3 kW charging and discharging power. They get 140 cycles per year. That amounts to 1400kWh mathematically and with a calculation like above 280€ benefit per year. They have a different usage profile and the significantly lower charging and discharging power limits the benefit when a lot of electricity is needed from the battery. Just to illustrate the statement [Die Speicherdimension, Lade- und Entladeleistung müssen zum Verbrauchsprofil passen um profitabel zu sein].

I come to around 270 cycles per year.

Wow. Do you have that much base load during the night that you almost drain the 8kWh every day, or do you occasionally need more during the day than you generate? Since 01.04., I have not had a single day with 8kWh grid consumption without storage, always only about 4kWh.

Wow. Do you have such a high base load overnight that you almost daily drain the 8kWh completely, or do you occasionally need more during the day than you generate? I have not had a single day with 8kWh grid consumption since 01.04. without storage, always only around 4kWh.

Yes, high base load and yes, occasionally high consumption. Base load includes among others a whirlpool, above-average amounts of cooling and freezing volume... Peak load includes among others an electric car, a ceramic kiln, a continuous flow water heater (children's apartment), terrace heating with infrared, 2 kitchens with induction cookers... In addition, at least 2 residents of the house handle energy quite carelessly. There is a reserve at the second house connection, to which "only" the second children's apartment is connected, but not the photovoltaic system.

I'm not getting any younger either, but I can't remember a power outage that lasted longer than 5 minutes.

To me, the equipment that I can use 24/7/365, and do use, is worth every penny.

The world is just that different.

However, today we have a different producer and demand structure than 20 years ago.

I'm not getting any younger either, but I can't remember a power outage lasting longer than 5 minutes.

Google "power outage Würzburg" - we had 3 hours of blackout last week due to an old cable that gave its last "do it without me" sigh.

It certainly won't be the last of its kind...

But today we have a different producer and demand structure than 20 years ago.

It certainly won't be the last of its kind...

At least the average has not changed. Per consumer (= household), you can expect 2 minutes of power outage per year (low voltage is orange). And that has been consistent for 20 years. You could also look at statistics by federal states and every reported interruption in an Excel table at the Federal Network Agency. But the data here is more than enough for me to classify the general risk of power outage as negligible. Of course, there can always be individual cases. But that is (for me) not sufficient reason to seriously worry about it.