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
guckuck2 schrieb:
The conclusion is understandable based on the values mentioned.
However, 2000 kWh is a low amount and 60% coverage by photovoltaic is quite high, so the ratios can easily shift depending on one’s personal “reality.”
But yes, you won’t save hundreds of euros this way; for us, it’s just under €100 per year. Is it approximately clear how much heat pump electricity can be covered by photovoltaic + battery (secondary to household electricity)?
All the solar companies I contacted couldn’t calculate that and instead simulated it via increased household electricity. I then calculated it myself using a modified existing tool since I know my consumption.
Since there will soon be roughly 7 cents/kWh (7¢/kWh) feed-in compensation, the heat pump will then cost about (rounding up for the future) 17 cents/kWh (17¢/kWh) and in Hamburg 23 cents/kWh (23¢/kWh) (feeding-in losses deducted due to self-consumption of saved utility costs).
Well, this is also hard to generalize. If you have a very large photovoltaic system, the chance is higher to store some energy in winter that the heat pump can use even outside of sunlight hours. But with household-sized systems (photovoltaic and storage up to 10 kWp/kWh), I would consider the effect of the storage in winter negligible.
guckuck2 schrieb:
Well, that’s hard to generalize. If you have a very large photovoltaic system, the chances are higher to store some energy in winter that the heat pump can use even outside of daylight hours.
But for household-sized systems (photovoltaic and storage up to 10 kWp/kWh), I would consider the effect of storage during winter negligible. Additionally, I think storage prices are still too high, and there are no subsidies available here (Brandenburg). We are having a 13.29 kWp photovoltaic system installed and will probably wait for subsidies.
Another point to consider with your builder is the "meter cabinet." The standard version probably only accommodates one meter. At least in our case, they wanted an extra €1,200 (about $1,300) for the larger cabinet for two meters.
That was ultimately the deciding factor for us to decline. With monthly meter fees and so on, the savings are minimal or nonexistent anyway. For the additional cost of over €1,000 (about $1,100) for the larger meter cabinet, you are basically at a loss.
You should take that into account as well.
That was ultimately the deciding factor for us to decline. With monthly meter fees and so on, the savings are minimal or nonexistent anyway. For the additional cost of over €1,000 (about $1,100) for the larger meter cabinet, you are basically at a loss.
You should take that into account as well.
S
Stefan2.846 Oct 2021 08:04Hello everyone,
A quick question:
The system has been running since mid-August. I still have 2 meters that were somehow newly connected.
I am currently working on the VAT advance return but I’m having some trouble understanding it. I haven’t received a contract for the feed-in tariff from the energy provider yet. Although it’s in progress, it’s taking some time. Without this contract and the numbers included, I assume I can’t complete the VAT advance return yet? How do you usually handle this?
Does anyone have a document that explains this topic in a simple way?
Thanks and best regards
A quick question:
The system has been running since mid-August. I still have 2 meters that were somehow newly connected.
I am currently working on the VAT advance return but I’m having some trouble understanding it. I haven’t received a contract for the feed-in tariff from the energy provider yet. Although it’s in progress, it’s taking some time. Without this contract and the numbers included, I assume I can’t complete the VAT advance return yet? How do you usually handle this?
Does anyone have a document that explains this topic in a simple way?
Thanks and best regards
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