Offer for photovoltaic system including storage - Storage yes/no?

I still have an "old" 10kWp system on the roof. Therefore, no storage (the benefit of which I am not convinced of in most cases). I use just under 30% of it for myself, feed in just under 7,000kWh. Grid consumption is another 7,000kWh.

I wanted to install another 3kWp myself this year. But other construction sites got in the way.

I also recommend, like , to obtain other offers. I see the solution from Nida35a as more affordable and it also corresponds to the current trend. Especially since your builder is doing the roof anyway, better synergy effects should be achievable.

In general, a full roof and storage is slowly reaching the point where it can definitely be worthwhile.

A storage system makes more sense today than ever before. Everything else is pure nonsense. Yes, everyone will now jump on me again, but that’s just how it is.

A 10 kW storage system should cost less than 5000 euros. A storage system with 6.5 kW is clearly too small. A single-family home should always have between 10 and 15 kW.

It can quite well happen that when your system goes into operation, the feed-in tariff is abolished. Then you have a great full-feed-in system and give away the electricity for free while on the other hand you pay dearly for the electricity you draw from the grid.

I still don’t understand why a storage system should not be worthwhile. The value-added tax on photovoltaics was abolished, module prices have fallen by half and are at a record low, storage prices have dropped.

I have a 7.5 kWp system with a 10 kW storage system, need almost no electricity from the grid from mid-March to mid-November, still feed in about 3000 kWh.

But go ahead. Fill up your roof, feed in for 8 cents and be happy. Then you just sit in your kitchen and only run your dishwasher at noon when the sun is shining. I don’t care at all. For me, everything runs at night and during the day the normal electricity consumption is covered.

And such a system on a single-family home with a decent storage system should not cost more than 10,000 euros.

My electricity consumption has dropped from just under 6000 kWh to 1200. The additional 200 euros feed-in tariff don’t make me rich now either.

Buchsbaum, give me some numbers. How much did your storage cost, how many kWh does it handle per year?

Unfortunately, storage systems never help the environment and almost never the wallet.
You can simply calculate: electricity costs 30ct/kWh. Feed-in tariffs are 8ct/kWh.
That means you can save 22ct/kWh through the storage. If you subtract conversion losses and the like, you end up at 20ct/kWh.
If things go very well, you get 200 cycles/year through the storage (with small storages, with large ones it’s often only 150, because in winter you don't fully charge and in summer you don't fully discharge).
So you can save 30-40€/kWh/year through a storage system.

With 5kWh that’s about 200€/year, with 10kWh about 300€/year.
Assuming a lifespan of 10 years, such a 5kWh storage may cost at most 2000€ (including installation and the like) and a 10kWh storage a maximum of 3000€.

I have deliberately omitted interest and expected electricity price increases.
They should roughly balance out.

Internet price for the Huawei Luna 2000 storage with 10 kW today 3979.00 euros! A very fine device and the best on the market. Trina Vertex 450 W modules cost each 68.80 euros. 1400 euros cost 10 kWp modules. Another hybrid inverter for 860 euros, a bit of mounting material, a smart meter and the electrician. (Huawei Sun 8 KTL1, three-phase) You get a 10 kW system with storage for 8 -9000 euros. And indeed one of the very best. And something like that pays off after 6 -8 years. As said, prices are currently at a record low.

Internet price for the Huawei Luna 2000 storage with 10 kW today 3979.00 euros!
Another hybrid inverter for 860 euros, some mounting material, a smart meter and the electrician. (Huawei Sun 8 KTL1, three-phase)

So just for the storage about 5000€ extra costs.
With 150 cycles/year and 10 years lifespan, 15,000 kWh would pass through.
With 8 ct/kWh lost feed-in tariff and 10% losses, a kWh from the storage costs you 45 ct/kWh.
I currently pay almost half that to my electricity provider... so that sounds like a pretty stupid deal.