ᐅ Photovoltaic system / heat pump – do you have two meters?
Created on: 2 Jan 2021 07:15
C
chewbacca123
Hello and Happy New Year!
I have a question – since last October, we have had a photovoltaic system on the roof, including a battery storage.
Previously, we had two electricity meters: one for general electricity and one for the heat pump because of the reduced electricity rate.
Our electrician connected the heat pump’s electricity to the general meter due to the photovoltaic system, so we could see how this setup works and whether the heat pump benefits from the solar generation.
In December, we had a consumption of 700 kWh, which is quite high! Our general electricity use is usually around 250 to 300 kWh per month.
I understand that these are the darker months and it should improve from March, with likely much lower electricity consumption as the photovoltaic system generates more and the heat pump uses less.
How do you handle this – do you only have one meter now? Or do you keep the heat pump on a separate meter?
Thanks and best regards
I have a question – since last October, we have had a photovoltaic system on the roof, including a battery storage.
Previously, we had two electricity meters: one for general electricity and one for the heat pump because of the reduced electricity rate.
Our electrician connected the heat pump’s electricity to the general meter due to the photovoltaic system, so we could see how this setup works and whether the heat pump benefits from the solar generation.
In December, we had a consumption of 700 kWh, which is quite high! Our general electricity use is usually around 250 to 300 kWh per month.
I understand that these are the darker months and it should improve from March, with likely much lower electricity consumption as the photovoltaic system generates more and the heat pump uses less.
How do you handle this – do you only have one meter now? Or do you keep the heat pump on a separate meter?
Thanks and best regards
Unfortunately, we currently have two meters and will monitor the situation during the first year. Unfortunately, our local utility company does not allow a second meter or simultaneous operation of the heating system with the photovoltaic system. In that case, the second meter will be removed later.
We have only one meter for our system. If you want to optimize the use of photovoltaic energy for the heat pump, you can schedule the heat pump’s operating times during the day (which is naturally more difficult in winter when it’s cloudy and dark). It’s a bit tricky, but if you have underfloor heating with a suitable thermal mass in the screed, you can still gain some efficiency this way.
W
WilderSueden2 Jan 2021 21:03chewbacca123 schrieb:
Previously, we had two electricity meters: one for general electricity and one for the heat pump because of the reduced electricity rate.
Our electrician connected the heat pump’s electricity to the general meter due to the photovoltaic system, so we can see if this setup works and if the heat pump benefits from the energy production. I recently asked myself if this makes sense and did a small calculation.
SW Konstanz:
Basic fee for heat pump meter costs €184 per year
Heat pump electricity price: 24.8 cents/kWh
Green electricity base rate: 30.9 cents/kWh (standard supply, 6 cents difference)
Green electricity online: 28.3 cents/kWh (SWKN’s cheapest tariff, 3.5 cents difference)
Having a separate meter pays off compared to the standard supply after about 3000 kWh, and for the cheaper tariff after about 5200 kWh. More affordable offers found online would likely be in a similar range. I doubt that we will exceed these thresholds and will have everything connected to one meter for now. The photovoltaic system will then be an additional bonus on top.
(If I made any mistake in my reasoning here, please point it out.)
H
hampshire3 Jan 2021 01:47guckuck2 schrieb:
Using a resistive heater to burn photovoltaic electricity? Don’t you feed excess electricity back into the grid, so that this emergency solution would apply? Especially when a heat pump is available, this seems very odd. “Emergency solution” is a strange term – there is no emergency here. During the sunny months, we produce domestic hot water using our own electricity. Financially, it’s (still) roughly break-even, and I feel good about and enjoy using our own power first.
H
hampshire3 Jan 2021 01:55BobRoss schrieb:
What is the size of the installed photovoltaic system, and how large will the battery storage be?9.99 kWp system 8 kWh storage capacity initially.
8 kW charge-discharge power (so far, hardly anyone pays attention to this value, although many storage systems cannot even supply an induction cooktop from the battery)
Lots of interfaces for smart control of key appliances.
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