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

It’s clear to me (I have a degree in business administration, among other things). On the other hand, I didn’t take the (presumably) rising electricity prices into account. Of course, you can also solve an equation with X unknowns to the second decimal place “exactly” 😉

But I don’t really care: overall, I save/earn about €2,000 per year (around $2,200) guaranteed for twenty years. Subtract the €1,000 depreciation per year (around $1,100) – then it’s still a 5% return (minus interest if financed externally)... nowadays, you can invest money worse than that.

And yes, technology can break down after twenty years, so the return might be less. But negative? I don’t see how.

Hangman schrieb:

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

Hello Hangman,
that price is really quite good.
Would you be willing to share where and when you placed your order?
I would be interested myself for that price 😉

Hangman schrieb:

- approx. 4,000 kWh for own consumption (equivalent to about €1,200 per year)
- approx. 9,000 kWh fed into the grid (equivalent to about €800 per year)

What about taxes, depreciation, etc. (also for self-consumption)? With a battery storage system, you won’t break even any earlier than 15 to 20 years.

I don’t want to speak badly of photovoltaics, but this calculation is too simplistic.

Especially, where else can you get such a large battery storage and 14 kWp for these prices? Normally, you would easily pay about 50% more.

And the electricity price is only theoretically increasing; thanks to switching bonuses, it has remained almost stable over the last 5 years. The current political trend is toward reducing the price per kWh and shifting the burden on fossil fuels through a CO2 tax. No one knows what the future holds! The past is not always the best indicator for what’s coming.

So today was one of those days again. Outside it was very cold, 0 degrees Celsius (32°F) during the day but with full sunshine. Inside the house, it was 23 degrees Celsius (73°F), almost unbearable. The heating then turned on, and we had to ventilate the whole day. In my opinion, that is a waste of energy.

But I have no idea how to counteract this. Do you do it the same way?

Bookstar schrieb:

So today was one of those days again. Outside it was very cold, around 0 degrees Celsius (32°F) during the day, but full sun all day long. Inside the house it was 23 degrees Celsius (73°F), almost unbearable. Then the heating kicked in, and we had to keep ventilating the entire day. In my opinion, that’s just a waste of energy.

But I have no idea how to avoid this. Do you deal with this the same way?

For me, it was 26.1 degrees Celsius (79°F) on the ground floor today, and right now it’s 24.7 degrees Celsius (76°F). The heating has been off since 1 p.m. and won’t be switched on again until tomorrow noon.

How do I deal with it?! Well, I don’t fully ventilate and the roller shutters are kept up. Strictly speaking that’s not necessary with such sunshine since the heat comes free, but even when it’s free, it still feels like a waste.

Today I tried to reduce consumption as much as possible. Yellow indicates energy fed into the grid, the rest is consumption.