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
chewbacca1233 Jan 2021 08:12hampshire schrieb:
9.99 kWp system
8 kWh storage capacity to start with.
8 kW charge-discharge power (so far, hardly anyone pays attention to this value, even though many storage systems can’t power an induction cooktop from the battery)
Plenty of interfaces for intelligently controlling important appliances. We have similar capacities in our system. Our storage is from BYD.
It can also be expanded individually later, if desired.
I think we will also do without a meter and run all electricity through a single one. We’ll review the balance in summer.
hampshire schrieb:
The term emergency solution seems strange here – there is no real emergency. During the sunny months, we produce hot water using self-generated energy. Financially, it is roughly break-even (for now), and I feel good about it and enjoy using my own electricity first.Heating rods are a last resort because they represent the least efficient way to use electricity generated from photovoltaic systems. Therefore, “emergency” is exactly the right term, for example, in off-grid scenarios where there is no other use for the photovoltaic output.
It is quite unusual to choose heating rods instead of using the existing heat pump.
guckuck2 schrieb:
Compare the rates online. On verivox, there is also a heat pump electricity comparison. I pay 19 cents per kWh and a €6 monthly base fee.
One mME costs €20 per year. This varies greatly depending on the region.
With a heat pump and photovoltaic system, we also have only one meter.
halmi schrieb:
This varies greatly by region.
We only have one meter for both the heat pump and the photovoltaic system as well. That's true, although the annual cost for the second meter is capped nationwide at 20€ (about $22). This represents the additional charge caused by having a second meter.
The heat pump electricity tariff from our local supplier is more expensive than my household electricity, which I found through price comparison... so it is worth comparing. As mentioned, some comparison platforms can now also compare tariffs specifically for heat pumps.
H
hampshire3 Jan 2021 16:59guckuck2 schrieb:
Why anyone would want to use a heating element instead of the existing heat pump is truly puzzling If you need a practical, rational reason: The heat pump wears out due to the switching cycles. No switching cycles during sunny periods promises a significant extension of its service life.
Not financially rational: Where we are, the electricity is basically all coal-generated—balancing groups or not—I want to use as little of that dirty power as possible. I prefer using inefficient solar power rather than efficient coal power.
With the heat pump, you triple the efficiency of the photovoltaic electricity. Naturally, you don’t want short cycling; for that, there are modulating pumps and minimum run times/hysteresis. The storage also smooths out the system, and it is said to be very smart according to the manufacturer, so you can definitely make use of that and leave the immersion heater in the museum.
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