Electricity meter for heat pump in combination with BAFA and photovoltaic

  • Erstellt am 2021-08-20 07:08:30

Markus254

2021-09-08 09:22:50
  • #1
 

Pumpernickel1

2022-01-02 21:34:42
  • #2


Hello, thank you for your reply. I am considering whether this two-way meter solution is the right one for our project. According to your answer, a two-way meter is sufficient if photovoltaics are available. What if the photovoltaics are only installed after 2-3 years?
The electrician’s suggestion so far was to install 2 separate electricity meters. However, when installing photovoltaics, only 1 electricity meter would be needed. Therefore, I wonder why install 2 meters now and whether that makes sense? My main question is, what should I have installed now (measurement of normal electricity and heat pump electricity) and for later in 2-3 years (with additional photovoltaics) to be well prepared? I am completely at a loss here.
P.S., we will get the Nibe S1255-6 S/W brine heat pump.
 

Hangman

2022-01-02 22:20:34
  • #3
Well, if you now want two separate rates, you also need two meters. Of course, this is not mandatory - you could also run the heat pump with the regular household electricity (then logically only one meter). Whether a heat pump rate is worthwhile, you have to calculate. Why do you want to add [Photovoltaik] in 2-3 years and not just do it now?
 

Pumpernickel1

2022-01-02 22:43:04
  • #4


We left it out for cost reasons for the time being. So, at the present time, it definitely makes sense to install 2 meters (provided it makes economic sense). But as soon as the photovoltaic system comes, only the space for 1 meter will be needed, namely the two-way meter you mentioned, right?
 

kati1337

2022-01-03 08:48:25
  • #5
We decided on one meter because it would have made little economic difference and we wanted to avoid the hassle with the correct cascading (is that what it's called?) of the meters. You can ask your grid operator what an additional meter costs you annually, and then you have to find out what the electricity costs are for your expected consumption – once for 2 tariffs with their respective energy prices and basic fees, and once if everything runs on one household electricity tariff. Then you can calculate the difference and see whether the savings are more than what the second meter costs you. If you have 2 meters and photovoltaics, it depends on how these meters are wired if you want to use the photovoltaic electricity for the heat pump and household. This was very important to us because we also have air conditioning, and in summer, when a lot comes from the photovoltaic system, the air conditioning rather runs than the heat pump. Somewhere there is a branching point where the excess photovoltaic electricity is fed into the grid. And the grid operator must, if I understand correctly, also offer the right "model" so that the photovoltaic electricity can be used both by the heat pump and the household (and if this is possible – who has priority there?), and only when neither needs it, it goes into the grid. For us, that was too much hassle because the second meter also wouldn’t have brought much economic benefit. Maybe 10 euros a year, and since those were only estimates, it could also have been negative.
 

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