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

Here is the conclusion first: Only the next annual statement will be meaningful, as the heat pump will then be optimized and the storage system will have been in use for 12 months.

I just received the annual statement from my electricity supplier.
12 months of grid consumption (02/07–02/06) totaling 3025 kWh. For now, this is just a raw number.
The additional details are:

- of which 12 months from photovoltaic
- of which, from 05/06, so 9 months with a 6.4 kW storage system
- 2.5 months (early 10/2020 to mid-12/2020) heated with wood
- 12 months heated and produced hot water with a non-optimized heat pump
- Electric car present, but due to COVID-19, driven 5,000 km (3,100 miles) less

How much did you use in total?

halmi schrieb:

How much have you used in total?

I can’t say because the two meters only show photovoltaic generation and grid consumption. I didn’t read the photovoltaic values from the billing display.

I’ll only be able to determine the self-sufficiency rate or self-consumption ratio on 05.05 (after a full 12 months), since the inverter has only been measuring total consumption since the battery was connected. Currently, self-sufficiency is at 65% and self-consumption at 44%. I hope to reach about 71% by May, assuming April and half of March will be sunny.

Your 3000 kWh compare to our approximately 9000 kWh. It will take a long time before that becomes worthwhile, unfortunately. Still, I think it will become necessary in the next few years. Especially charging the car seems to be worth it. How much did you invest in photovoltaic and storage, and what would you consider doing differently or not doing at all?

I also received an offer for a retrofit—from a friend who has already upgraded a few houses. But it’s still completely new territory.

And yesterday was the first time the battery storage ran empty/cold.

Two children bathed in the large bathtub and showered almost at the same time :p before that, the water temperature was already close to the lowest warm water temperature.

You can order it as is (I have the battery and the inverter myself). The price is also fine; it won't get any cheaper. But keep in mind that the scaffolding is listed as "provided by the builder." The scaffolding will cost you an additional €1,000.

You don't need the expansion module if your daily consumption is around 12-14 kW.

From mid-May to the end of September, I always had 20-30% battery capacity left after the night until the photovoltaic system charged it again.

From mid-October onward, the battery hardly ever got fully charged.

It always depends on how you calculate. For you, the expenses are around €18,000 at the top. For me, it was always included in the home financing and paid off along with the house.

I also find the offer quite good.

Next week, the temperatures will get interesting again here.