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

Since I don’t have a separate heat pump meter, my estimate of 1,900 kWh is based on a detailed guess 😉 However, I believe it is fairly accurate. Since there are only two of us, our hot water consumption is significantly lower (around 300 kWh), with the remaining 1,600 kWh used for heating. In addition, there are 250 kWh for the controlled residential ventilation and 2,000 kWh for household electricity. In total, that amounts to 4,150 kWh, of which 70% came from the roof. We have about 170 heated sqm (square meters) (1,830 sq ft), KfW40 standard, and a modulating ground-source heat pump. The location is Hochsauerland, so this year has been really cold.

Regarding the heat pump itself, it does modulate the heating capacity, but not the pumps – they are fixed at 70%. Since the heating demand mostly runs at very low levels, we will probably have a disproportionately high share of pump electricity consumption. The seasonal performance factor listed for the heat pump is 5.8 for heating and 4.3 for hot water (resulting in a combined value of 5.6), which I find hard to believe. I suspect these values exclude pump electricity, and are therefore overly optimistic.

Hangman schrieb:

In total, 4,150 kWh, of which 70% came from the roof.

How large is your photovoltaic system? What is the annual electricity production? 70% is already very good. What specific energy management measures led to this result?

Hausbau 55 schrieb:

How large is your photovoltaic system? What is the annual electricity production? 70% is already very good. What special energy management measures led to this result?

The photovoltaic system has a capacity of 14.4 kW on a roof pitched at 38° facing south. There is no smart equipment or energy management system; I have simply fixed the water heating to run from 1 to 3 pm and reduce the floor heating setpoint temperature by 2° between 6 pm and 4 am. Whenever it makes sense and is possible, we run the washing machine and dishwasher during photovoltaic surplus, but that probably doesn’t make much difference. Otherwise, everything is like in a completely normal, basic 220 V house without KNX.

The secret behind the 70% is probably the 10 kWh battery. If I understand the photovoltaic portal correctly, without it, we would be at 38% (1,579 kWh direct consumption / 4,154 kWh total consumption).

Hello everyone,
here is an overview of our setup.

2 adults
2 children
Living area 150 m² (1,615 sq ft)

Photovoltaic system 7.2 kWp, south-facing
One meter (bidirectional meter)
Controlled residential ventilation with heat recovery
KfW55 standard
Heat pump Novelan LADV 9.1-1/3

Total electricity consumption including heat pump for the year 2021 was 4,334 kWh.
Generation from the photovoltaic system was 5,686 kWh. I’m not sure where to check self-consumption. It uses an SMA inverter.

Total generation (displayed on the inverter) minus feed-in (2.8.0 on the meter) equals self-consumption over the entire operating period.

The inverter also knows how much you generated per day, month, and year. This way, you could break it down to 2021 using the billing data. You can read the inverter data with Sunny Explorer or, somewhat more complicated, via Modbus.

Deliverer schrieb:

Total production (displayed on the inverter) minus feed-in (2.8.0 on the meter) equals self-consumption over the entire operating period.

The inverter also knows how much you generated per day, month, and year. This way, you could break it down to 2021 using the billing data. You can read the inverter data with Sunny Explorer or, somewhat more complicated, via Modbus.

ah.... right^^ 😀

Please edit my post briefly