Consultation for photovoltaic systems

Right, the lost ice cream compensation would theoretically be about 200 euros for 3000 kWh. Can be ignored. However, I have planned quite a bit for consumption optimization, especially regarding the photovoltaic storage. I produce hot water with a simple 80L boiler.
This will now be replaced with a Wi-Fi-enabled device. It will then only charge with photovoltaic yield. Once warm, it lasts 2 days anyway.
Kitchen, as mentioned, optimized with a wood kitchen stove with oven. It runs anyway in winter and is used for cooking. In summer, of course, we then use the electric stove. The wife has to cook when the sun is shining. The same applies for ironing, washing machine, dishwasher, etc.

The base load in the evening and at night is then covered by the storage.

If I calculated correctly, you assume a self-sufficiency rate of only 35% without storage?
As optimized as you describe it, you should get well over 50%, without storage.
Is a storage really worth it for the last few percent? It's rather for people who like to do laundry at night ;)

PS: Don't get me wrong, I don't want to talk you out of it. I'm not deep enough into the subject for that. I'm just questioning the calculation for myself.

Durran sometimes isn't so good with numbers, when I think of the kitchen story ;)

If you google "Autarkie Rechner" and click on the first link, you can get a rough overview of what level of autonomy you get with which constellation of kWp, consumption, and storage.

I found all the calculations for the house (heat loss, heating load, photovoltaic yield, etc.) really interesting and detailed. And after the first year of practical experience, fortunately, on the whole, even accurate.

The big exception are the autonomy "calculators" of any kind (there are several). The HTW Berlin calculator shows 83% for me, the state of NRW even 90%. In practice, it was 70% last year with a high score in mid-November of 78%. Maybe these things are more realistic without battery figures – with battery, they are more like sunny dreams :cool:

Autarky is, after all, a completely irrelevant metric. The question is what I can do for the environment and what I can do for my wallet. Maximum autarky is at least very, very bad for the wallet...

The calculation again.

The photovoltaic system with 7.2 kWp should generate about 8000 kWh per year.
I can use 2000 kWh of that myself.
2000 kWh go into the storage.

So 4000 kWh are consumed myself, with a total consumption of 5000 kWh.

From this year on, instead of 1850 euros, I only pay 370 euros in electricity to the energy supplier.
With further rising electricity prices, of course, even more savings. And I am calculating with a service life of 20 years and longer.
In 8 years I will retire, every euro counts for me then.

I calculated with a self-sufficiency rate of 72 percent and a self-consumption rate of 50 percent. That is all calculated very conservatively.

I will pick up the storage on Saturday, a Huawei Luna with 10 kW. The price is reasonable. There will soon be hardly any more available. The BYD and LG storages are currently hardly deliverable. That will all be extremely problematic.

And before my money rots in the account, I’d rather invest it sensibly. As always, everything paid, no financing costs.
By the way, about what is always being nagged on the kitchen.

There are still pictures. Don’t worry. My old laptop broke down and I bought a new one. The pictures are on the hard drive of the old computer. I still have to transfer them to the new one. But the pictures will come. Promised.

: Have you also taken into account that most of your 2000 kWh falls in winter, which is rather poor in terms of sunlight? Why such a large storage system that you never fully fill with the system (except maybe in a very strong summer)? You don’t have a heat pump, do you?