PV system offer including storage - Storage yes/no?

I won’t make it too complicated.

Electricity costs before the photovoltaic system: 1800 euros p.a.
Electricity costs with the photovoltaic system + storage 400 euros p.a. incl. the Renewable Energy Act compensation

Savings p.a. 1400 euros.

Construction costs of my system in 2022 still with VAT 10,000 euros
Would be about 8000 € today.

I don’t see any problems regarding profitability. The money for the photovoltaic system was available and just sitting uselessly in the account. Currently, I don’t have any ongoing costs. And who actually says that the storage batteries only last 10 years? I haven’t heard of anyone whose battery has failed except the Senec storage. Yes, you only have a 10-year warranty. But how long they really last, nobody knows for sure.

What is probably true is that many people now go for a storage unit, retrofit a new inverter and retrofit the storage. Seems that it’s not so wrong after all. But well, everyone has their own philosophy. I’m a fan of storage, others just aren’t.

I’m now in the 2nd year, my system runs without problems and my self-calculated photovoltaic yields have come true exactly. I wouldn’t build without storage today either. It’s just a nice feeling when you no longer have to watch electricity consumption and it doesn’t matter when the washing machine runs. I don’t want to train my wife either, in terms of only washing at noon, etc. I don’t care.

With us, a lot runs in the morning and evening. In the morning the coffee machine, the toaster, lighting and in the evening the stove, the kettle, the microwave. I don’t have photovoltaic electricity then. When it rains on the weekend too, it gets bad without storage.
It also bridges 2 days of rainy weather.

The system on the roof can never be big enough:
- Marginal costs: 15kWp do not cost 50% more than 10kWp. As others have already written, the material costs are now unbelievably low. Really good modules cost between €0.15-0.2/Wärmepumpe. Inverters under €200/kWp. With mounting material, you come to €500/kWp. These are consumer prices without VAT, so there is an additional surcharge from the solar installer, but that is currently the trend.
- With acquisition costs of €1000/kWp and 100% feed-in in the self-consumption model (€0.08/kWh), the system pays off after 12-15 years. That is the absolute worst case; every kWh consumed yourself improves this to 6-9 years. (Example with €0.3 grid price, 1000kWh/kWp and 800kWh/kWp, without financing costs).
- You do not want to use the largest share of the production yourself, but you want to generate most of your consumption yourself. The problem is winter, when the probably available Wärmepumpe requires the largest part of the annual energy and at the same time the roof has the least yield. A perfect south-facing roof with 30° pitch produces about 3 times as much in summer as in December.

Then there is the topic of battery, which, as you can see, can be debated extensively. Since it unfortunately cannot shift the summer overproduction into winter, its cost/benefit ratio depending on size must be calculated quite precisely. In any case, it also assumes that the system on the roof is as large as possible, otherwise there is not enough surplus in winter.

If you have the possibility to have the photovoltaic system prepared but be able to remove it from the contract and then subcontract it, this could be significantly worthwhile. €1000/kWp for photovoltaic only and max. €1500/kWp with battery are currently normal prices, exceptions downward and especially in new buildings should be possible. With craftsmanship skills and an electrician who lets you do a lot, you can get to €500/kWp. Recently helped a friend install 24kWp on the shed roof. That is absolutely no rocket science on the roof, stay away from the basement.

Internet price for the Huawei Luna 2000 storage with 10 kW today 3979.00 Euro! A really fine device and the best on the market.
Trina Vertex 450 W modules cost 68.80 Euro each.

10 kWp modules cost 1400 Euro.

Another hybrid inverter for 860 Euro, 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 Euro. And a top-quality one at that. And such a system pays off after 6–8 years.

As said, prices are currently at a record low.

Not everyone dares to install the system completely by themselves. Therefore, you should talk about normal market prices. I do not mean the DIY market.

In a new building, I have all trades in the house. From the scaffolding to the electrician or the roofer. This means synergies. You just have to make use of them. Those who can't must simply pay more. Simple calculation.

In a new building, I have all trades in the house. From the scaffolding to the electrician or the roofer. This means synergies. You just have to make use of them. Those who can't do that just have to pay more. Simple calculation.

Oh, those synergies. You just have to say that you mean undeclared work.

1400 euros cost 10 kWp modules

And now forget the costs for the scaffolding, the wiring, the expensive rails, brackets, grounding, consumables, inverters, and many dozens of hours of work for at least two to three trades.

We also have the Trina modules, everything done ourselves (the scaffold had to stand longer for that for 250 gross/week) and come to about 8,000 EUR for 10.8 kWp without storage. Our modules cost about 80 EUR in April. My husband is an electrician, the registration and connection were then handled by a master electrician.

Of course, you have to add all the working hours to the above consideration, hardly anyone can really do everything themselves without being able to sleep well with it.