ᐅ Air-to-Water Heat Pump: Current Consumption and Data

MelanieSH schrieb:

I enjoy photovoltaics so much that the economic feasibility really doesn’t bother me at all.

I think this is an important point, and I can certainly understand it. I would probably feel the same, but I also understand the perspective regarding economic viability. As long as you are aware that it’s also about some fun and enjoyment, the outlook changes, so I don’t think there is really a right or wrong here. I can relate to both views.

seat88 schrieb:

The repair costs for your inverter will then add on top to the cost-effectiveness calculation.

Actually, it wasn’t broken at all. A simple restart got the system working again.

tomtom79 schrieb:

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

Since my system (14.4 kW peak with 10 kWh storage) cost almost exactly 20,000 euros, here are my numbers:

- approx. 4,000 kWh self-consumption (equivalent to about 1,200 euros per year)
- approx. 9,000 kWh fed back into the grid (equivalent to about 800 euros per year)

Total of 2,000 euros per year, or 10% of the initial investment. Every second fund manager would kill for this return 😉

Of course, you can argue about the numbers, but even if it were only 1,500 euros per year and I set aside half of that for possible repairs, it would still be 3.75%. That’s significantly higher than any current loan interest rate.

Besides that, I’m more independent from rising electricity prices and could—since we are in a housebuilding forum—install my photovoltaic panels on a south-facing roof with much less effort for heat protection (I should actually subtract this saving from the 20,000 euros). And there was also something about the environment 🙄

MelanieSH schrieb:

I have to say, I never really understood the economic calculations. We have a photovoltaic system with 9.92 kWp, a 13 kWh battery storage, and an electric car. I enjoy the photovoltaic system so much that the financial aspect really doesn’t matter to me. Yesterday, the inverter was down for half a day, and that made me realize I don’t want to go a single day without photovoltaic power...

PS: A photovoltaic system is ALWAYS worth it.

Well, that’s more of an ideological view. There’s no extra value whether your electricity comes from the grid or your own roof (yes, it still comes from a socket, I know). You could also invest the $20,000 in a heat cabin/sauna, kitchen appliances, or vacations — things that add more quality of life 🙂

If you really have extra money, I agree with you. Then it’s always a good investment!

Hangman schrieb:

Since my system (14.4 kW peak with a 10 kWh battery storage) cost almost exactly €20,000, here are my numbers:

- about 4,000 kWh self-consumption (equivalent to around €1,200 per year)
- about 9,000 kWh fed into the grid (equivalent to around €800 per year)

That adds up to €2,000 per year or 10% of the initial investment. Any fund manager would kill for that return 😉

You can, of course, debate the numbers, but even if it were only €1,500 per year and I set aside half of that for possible repairs, it would still be a 3.75% return. That’s clearly higher than any current loan interest rate.

Besides that, I am (more) independent from rising electricity prices and, since we’re here in a house-building forum, I was able to install my photovoltaic system on the south-facing roof with significantly less effort for heat protection (I should probably deduct those savings from the €20,000). And there was also something about the environment 🙄

Sorry, but your numbers are absolutely far-fetched. I could easily come up with a counterexample, and then you’d quickly be looking at a 30-year payback period.

Outliers are not relevant for most people. And I don’t trust these kinds of rosy calculations anyway—otherwise, my Porsche in the garage would suddenly be a profitable investment too (yes, it’s a great store of value!).

Hangman schrieb:


...
So the total is €2,000 per year or 10% of the initial investment. Every second fund manager would kill for that return 😉
...

I don’t want to dispute the numbers or misunderstand you, and I’m not against photovoltaics... but it should be noted that from a business perspective, this view isn’t quite accurate. You’re aware of that, right?

If you manage to sell your system in 10 years for €20,000, then of course you’re right (without questioning the figures)... but since that won’t be the case, there’s a small detail missing in your calculation 😉