Air-water heat pump current consumption and data

I enjoy photovoltaics so much that economic viability really doesn't matter to me.

I think this is a significant point that I can also understand. I would probably feel similarly, but I also understand the perspective of economic viability. As long as you are aware that it is also a bit of fun and joy, the view on it changes, and so there is no right or wrong, I think. I can understand both.

The costs for repairing your inverter are then added on top of the cost-effectiveness calculation.

Actually, it wasn't broken at all. The system worked again after a restart.

And for these 20,000 euros you can buy a lot of electricity.

Since my system (14.4 kW peak with 10 kWh storage) cost almost exactly 20K€, here are my figures:

- approx. 4,000 kWh self-consumption (equivalent to about €1,200 p.a.)
- approx. 9,000 kWh feed-in (equivalent to about €800 p.a.)

Sum total is therefore €2,000 p.a. or 10% of the purchase cost. Every second fund manager would kill for this return ;)

Now you can nitpick the numbers, but even if it were only €1,500 p.a. and I set aside half of that for possible repairs, it would still be 3.75%. So clearly more than any current loan interest rate.

Apart from that, I am (more) independent from rising electricity prices and could – since we are here in the house building forum – install my photovoltaic south roof significantly less expensively for heat protection (I should actually deduct the saving from the 20K). And then there was also something about the environment :rolleyes:

I have to say that I never understood the economic efficiency calculations. We have a photovoltaic system with 9.92 kWp, a 13 kWh battery, and an electric car. I enjoy the photovoltaic system so much that economic efficiency really doesn't matter to me at all. Yesterday the inverter failed for half a day, and that's when you realize you don't want to live a day without photovoltaic power....

PS a photovoltaic system is ALWAYS worth it.

Well, that's ideological in nature. You don't gain any added value whether the electricity comes from the outlet or from your roof (yes, it also comes from the socket, I know). You could also invest the 20,000 in a heat cabin/sauna, kitchen appliances, or vacations. Things that simply bring you additional quality of life :) If you really have money to spare, I agree with you. Then it is always a good investment!

Since my system (14.4 kW peak with 10 kWh storage) cost roughly exactly 20K€, here are my numbers:

- approx. 4,000 kWh self-consumption (equals approx. 1,200€ p.a.)
- approx. 9,000 kWh feed-in (equals approx. 800€ p.a.)

Total thus 2,000€ p.a. or 10% of the purchase price. For this return, every second fund manager would kill ;)

Now, you can nitpick the numbers, but even if it were only 1,500€ p.a. and I set aside half of that for possible repairs, it would still be 3.75%. So clearly more than any current loan interest rate.

Besides that, I am (more) independent from rising electricity prices and was able—as we are here in the house building forum—to implement my photovoltaic south roof considerably less elaborately for heat protection (I should actually deduct the savings from the 20K). And then there was also something about the environment :rolleyes:

Sorry, but that is absolutely ridiculous with your numbers. I could now come up with a counterexample and then you'd quickly be at 30 years payback time.

Outliers are not interesting for the majority. And I don’t care for such rosy calculations anyway, otherwise my Porsche in the garage would also be profitable (yes, it’s a great investment!).

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So a total of €2,000 p.a. or 10% of the acquisition costs. Every second fund manager would kill for this return ;)
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I don't want to mess with the numbers or misunderstand, I'm not against photovoltaics... you should just point out that from a business perspective this way of looking at it is of course not correct. You realize that, right?

If you sell your system after 10 years for the €20,000, you are of course right (without questioning the numbers)... but since that is not the case, there is a little thing missing in this consideration ;)