ᐅ Evaluation of Solar Power System Proposal with Battery Storage

Buchsbaum schrieb:

I still feed 2,500 kWh into the grid with my 7.2 kW peak system and 10 kW storage. That brings me 200 euros per year.
Not worth it.

Buchsbaum schrieb:

Plus, currently 3,200

That doesn’t add up.

Buchsbaum schrieb:

4500 kWh x €0.08 per kWh equals 360 euros feed-in tariff per year for me. 7,200 euros feed-in tariff over 20 years. That doesn’t pay off comfortably.

Why not? You can’t simply start from the €10,000 you paid with a storage system. How much would it have been without storage? And how much feed-in tariff would you have gotten if you had spent the €10,000 just on photovoltaics?
And how much (more) direct consumption, which you completely ignored in your calculation?

At first glance, it looks like your photovoltaic system with storage fully pays off. But it’s hard to follow your reasoning as long as you’re calculating like a milkmaid.

And another misconception:
Just because your photovoltaic system with storage is economical, that does not mean that photovoltaics without storage aren’t profitable. They might actually be even more profitable, to put it cautiously.
But then you’d have to "gift" your hard-earned electricity to the nasty DSO (distribution system operator) 🙄 *

Buchsbaum schrieb:

I have €10,000 in my account. Until last year, I had an electricity bill of €1,800. My system cost €10,000. Now I only pay €60 electricity. That’s €1,200 saved per year.
That’s a saving of €24,000 over 20 years.

Think about it again. For me, a year has 12 months.

*PS: By the way, the legally guaranteed feed-in tariff for 20 years does not have to be claimed. You can sell your electricity at any time to the highest bidder.

Thank you for your suggestions.

The problem that I, and probably most others here, have is the available space—specifically, sun exposure without shade in the right direction.

Of course, I could have installed twice as many modules on the roof instead of the battery storage. But where would I put them? In that sense, these recommendations might be suitable for some, but not for me.

And I’m sure you’re about to tell me who I can sell my small amount of electricity to at the best price? That’s completely unrealistic. I would really appreciate a specific tip on that.

Such free contracts only exist beyond the 30 kWp (kilowatt peak) threshold. And then you have to lay your own underground cable to the next grid feed-in point.

Buchsbaum schrieb:

And surely you will tell me right away who I can sell my very small amount of electricity to at the highest bid? That’s completely unrealistic. I would appreciate a concrete tip on that.

Such free contracts only exist beyond the 30 kWp (30 kW) threshold. And then you have to lay a buried cable yourself to the nearest grid feed-in point.

That’s exactly my point. You produce a product that nobody wants to buy in those quantities.
But it doesn’t matter, because you get a guaranteed off-take at a fixed price for 20 years, guaranteed by the government, which you can base your calculations on.
You can choose to do it or not. I just don’t understand the complaining.

Why didn’t you get any energy performance certificates (EPCs)? That makes the offer hardly comparable.

I paid 15k without a battery for 11.34 kWp. In that context, the 19.5k from @sysrun80 in post #13 seems more realistic to me.

hanghaus2023 schrieb:

Why didn’t you get any energy performance certificates? The offers are hardly comparable otherwise.

I paid 15k without storage for 11.34 kWp. So the 19.5k from @sysrun80 in post #13 seems more realistic to me.

Hello Hanghaus,

they only offer fixed-price packages. But now something has come up that we can assemble ourselves and buy as a kit. Then I will install even more modules and still stay under 15,000 Euros without storage.

Best regards

Dachshund90 schrieb:

Something has come up that allows us to assemble it ourselves and buy it as a kit. I will take even more modules and still stay under 15,000€ (about $16,000) without storage.

Best regards

However, you should find an electrician beforehand who is certified by the grid operator. You absolutely need them for the final notification to the utility company. I doubt anyone will handle this who didn’t install the system themselves.

If you can install the mounting hooks during the roof construction, it will save a lot of work.

The advantage is that you can use the scaffolding immediately.