Optimization of heat pump LWD 70A with photovoltaics

What do you want with blocking times there? Heat when the sun shines

Of course I want to heat in winter when the sun shines. Or didn't you understand how a heat pump works?

In winter, the output of your photovoltaic system is close to zero! No matter which modules are installed and no matter how large your system is. We will now assume a typical system on a single-family house. Perhaps the photovoltaic system provides a few kWh, but that can be neglected.

The sunny days from November to February are limited, we have already had Novembers without sun, then there is snow and ice, and the short days, the lower sun angle, etc.

And since the highest electricity consumption of a heat pump is admittedly in winter, it needs the most power when the photovoltaic system provides the least. So you have to heat with electricity.

I am actually curious, when we get another really frosty winter, how the owners of heat pumps will react to the high electricity consumption of their heat pumps. When it is minus 20 degrees outside for weeks and the supply temperature has to be electrically increased to 36 degrees. And whether 36 degrees supply temperature is sufficient even in well-insulated houses? It remains exciting.

The last few years we only had mild winters. And if now the argument with Norway comes up again. Yes, sure, it is much colder and darker there than here. One must not forget that a Norwegian only pays 4 cents per kWh and we pay around 40 cents here.

So 10 times more expensive. Heating electrically has never been good and never cheap.

Therefore, schedule the heating cycle during the day, as it is naturally usually warmer than at night. So better COP. Maybe if there is no snow on it, the photovoltaic system also brings a few kW.

And this is an on/off heat pump, its running time shows that it is not working optimally with 17 minutes.

I am actually curious how the owners of heat pumps will comment on the high electricity consumption of their heat pumps when we get such a really frosty winter again. When it is minus 20 degrees outside for weeks

Phew, I’m glad to live in Germany and feel global warming. Cold winters belong to the past. There may be regions where it might be cold for longer (like low mountain ranges), but widespread -20 degrees during the day for weeks you won’t experience anymore. The last cold waves you mentioned happened in 1929 and 1956. According to DWD, such outliers occur about every 50-100 years in a normal (and nowadays significantly warmer) winter. Better go to the regulars’ table again tonight. Your regulars’ table slogans will probably be better received there and not questioned ;-)

Hello,
what is the name of the circulation pump in the menu and why should I turn it off or let it run once a day?
Should the optimization also be turned off? Or is that the circulation pump? In connection with photovoltaics.

I have entered hot water blocking times,

blocking from Mon - Sun
16:30 - 9:30 (I have a photovoltaic system that is oriented to the east).
I set the hot water to 46 degrees with a 6-degree hysteresis.
I also changed the heating curve from 34 to 28.

What else do I need to set or should I?
Here are my current data

Commissioning	Heat pump
15.9.2023	13:42
Serial number
KD index
Serial number
KD index
IP
Subnet mask
Broadcast
Gateway
System status:
Heat pumps	Type	LD7
Software version	V2.88.3
Revision	9717
Control panel	1003
Bivalence	Level	1
Operating status	----
System	Setting:
EVU lock	none	ZWE
Room station	No
Integration	Return flow
Mixing circuit	1	No
Mixing circuit	2	No
Mixing circuit	3	No
ZWE1	Type	Heating element
ZWE1	Function	Heater	and	Hot water
ZWE1	Power	6.0	kW
ZWE2	Type	No
ZWE2	Function	No
ZWE3	Type	No
ZWE3	Function	No
Fault	none	ZWE
Hot water 1	Sensor
Hot water 2	ZIP
Hot water 3	with	ZUP
Hot water 4	Setpoint
Hot water 5	with	HUP
Hot water + heat pump	max	0.0	h
Pump optimization	Yes
Access	Customer service
Monitoring VD	On
Control	Heating circuit	Outdoor temperature dependent
Control	Mixing circuit 1	Outdoor temperature dependent
Control	Mixing circuit 2	Outdoor temperature dependent
Control	Mixing circuit 3	Outdoor temperature dependent
Boost heating	with	Mixing
Electric	Anode	No
Heating limit	Yes
Parallel operation	No
Remote maintenance	No
Pump optimization	Time	180	min
Efficiency pump	Yes
Heat quantity	Cooling circuit
Solar control	Temperature difference
Message	TDI	Yes
Multi-storage	No
Release	ZWE	60	min
Hot water	Reheating	No
Hot water	Reheating	max	5.0	h
Smart	Grid	No
Control	Mixing circuit 1	fast
Control	Mixing circuit 2	fast
Control	Mixing circuit 3	fast
Temperatures	:
Temperatures:
Return flow limit	50.0°C
Hysteresis	HR	2.0	K
TR	Increase	max	7.0	K
Release	ZWE	-2.0°C
Air discharge temperature	7.0°C
TDI setpoint temperature	65.0°C
Hysteresis	Hot water	6.0	K
Outside temperature max	max	40.0°C
Outside temperature min	min	-20.0°C
T-LABT end	6.0°C
Setback	up to	-20.0°C
Flow temperature	max.	70.0°C
Temperature difference	On	4.0	K
Temperature difference	Off	2.0	K
Temperature difference	Storage	max	70.0°C
TEE	Heating	2.0	K
TEE	Hot water	5.0	K
min.	AT	Flow temperature	max.	-7.0°C
Flow temperature	Ground floor	62.0°C
Max. hot water temperature	65.0°C
Min.	Return flow setpoint	15.0°C
Night setback	Heating circuit	0.0°C
Heating limit:
Heating limit	17.0°C
Efficiency pump:
Efficiency pump	Nominal	8.25	V
Efficiency pump	Minimum	8.25	V
Efficiency pump	Yes
Heat quantity	Cooling circuit
Priorities	:
Hot water	1
Heating	2
System configuration	:
Heating	1
Hot water	1
Swimming pool	0
Heating curves	Heating	28.0C	20.0C	0.0K
Information	Operating hours:
Operating hours	VD1	5588h
Impulses	Compressor	1	18645
Running time	Ø	VD1	00:17
Operating hours	ZWE1	5h
Operating hours	Heat pump	5588h
Operating hours	Heating	4738h
Operating hours	Hot water	850h
Information	Temperatures:
Flow temperature	28.7°C
Return flow	28.0°C
Return flow setpoint	19.6°C
Hot gas	40.4°C
Outside temperature	20.8°C
Average temperature	14.8°C
Hot water actual	46.1°C
Hot water setpoint	46.0°C
Heat source input	32.4°C
Solar collector	5.0°C
Solar storage	150.0°C
External	Energy source	5.0°C
Flow temperature	max.	70.0°C
Suction	VD	41.0°C
Suction evaporator	29.3°C
VD heating	51.8°C
Superheat	12.2	K
Superheat	Setpoint	8.0	K
Yes	=	Yes
Shutdowns:
14.09.23	22:05	none	Start
14.09.23	10:12	none	Start
13.09.23	21:38	none	Start
13.09.23	04:47	none	Start
12.09.23	13:40	none	Start
Calibration	:
NTC1		0.0
NTC2		0.0
NTC3		0.0
NTC4		0.0
NTC5		0.0
NTC6		0.0
NTC7		0.0
NTC8		0.0

One more addition, I use thermostats