Savings photovoltaic system, storage, power cloud

In winter I still run a 1600W heating convector when I’m in the attic (almost daily).
We also have a very high water consumption of about 200m³ because we simply shower a lot. Especially the kids then like to sit in the shower until the hot water tank is empty :P
The heating rods then also naturally consume more electricity due to the high hot water consumption.

I actually didn’t find any contradiction in the screenshot. It seems to make sense to you - now. How secure is the basic fee for the coming years? Is it contractually fixed?

However, I see your break-even point being crammed out of the electricity meter come hell or high water. I personally find the regular, just-for-fun emptying of the water tank rather questionable, and then heating it up again with the heating rod? Why? Not to mention that the kids are taught that electricity and especially hot water are always freely available. They will thank you later when they move into their first own apartment, after receiving their first utility bill adjustment.

Without a storage tank, you still have the acquisition costs for the storage tank which then disappear, as well as maintenance costs. The same presumably applies to with and without Senec.

Of course, prices at Senec are adjusted annually. Just last month, we also received a letter stating that the monthly fee will be increased by €6. Compared to the price increases at other providers, however, this still seems reasonable. A colleague’s provider has now raised the basic fee from €10 to €30 per month and the usage price from 30 cents to 35 cents.

Of course, this can be discussed and I completely agree with you that there is potential for savings. But it’s not as bad as it might have seemed. It’s not that the kids do this every time they shower, but it does happen sometimes. Our two kids are now 8 and 4, and they also like to take toys with them and play while showering. I shower every morning, my wife showers every morning. With the current weather, I then shower again in the evening. That consumes quite a bit of water and accordingly it has to be reheated by the heat pump or the heating rods. And we do explain to our kids that all of this costs money ;)

That’s true. The acquisition costs would naturally be eliminated. With a saving of €600, which the storage would bring annually according to my calculation, you could say that the storage unit would have paid for itself after about 10 years.
So I calculated for myself that the storage would be worthwhile with a runtime of more than 10 years.
Since it is often said that storage units are not worthwhile, of course, it also depends on the price of the unit. I think mine was quite inexpensive.

I have no experience with maintenance costs. The system is now a little over 2 years old and so far nothing has had to be maintained. Actually, such a system should be maintenance-free, shouldn’t it? Any repairs that might occur in between would, of course, have to be included in the calculation afterwards.