ᐅ Electric Meter for Heat Pump in Combination with BAFA Subsidy and Photovoltaic System
Created on: 20 Aug 2021 07:08
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Markus254
Hello everyone,
I believe this topic has been discussed several times, but I couldn’t find a clear answer in the forum:
We are installing a heat pump funded by BAFA, which will also be powered by a photovoltaic system.
The heat pump will be supplied through the regular electricity tariff as well as the photovoltaic system.
The domestic hot water and heating water will be heated partly by the heat pump and partly by an electric immersion heater to use the photovoltaic electricity.
How many electricity meters do we need for the heat pump? Is a three-phase electricity meter sufficient (heat pump + immersion heater) to measure all power consumption?
Is an additional heat meter necessary?
Thanks and best regards,
Markus254
I believe this topic has been discussed several times, but I couldn’t find a clear answer in the forum:
We are installing a heat pump funded by BAFA, which will also be powered by a photovoltaic system.
The heat pump will be supplied through the regular electricity tariff as well as the photovoltaic system.
The domestic hot water and heating water will be heated partly by the heat pump and partly by an electric immersion heater to use the photovoltaic electricity.
How many electricity meters do we need for the heat pump? Is a three-phase electricity meter sufficient (heat pump + immersion heater) to measure all power consumption?
Is an additional heat meter necessary?
Thanks and best regards,
Markus254
M
Markus2546 Sep 2021 13:58guckuck2 schrieb:
Have the electrician install an intermediate meter ahead of the heat pump in the distribution panel. This has nothing to do with the official meters (or electricity tariffs).A bidirectional meter for the photovoltaic system plus heat pump and an additional intermediate meter ahead of the heat pump?
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RotorMotor6 Sep 2021 15:13Markus254 schrieb:
"The amounts of electricity or gas consumed by a heat pump must be recorded separately. Peripheral consumers (electric heating element; source pump, control system) must also be taken into account. The heat output from the heat pump must likewise be measured separately. In addition to external electricity and heat meters, which do not necessarily need to be calibrated, energy balances integrated within the heat pump are also acceptable."Please read the last sentence of your quote again. I don’t know of any subsidized heat pump that does not have the corresponding integrated meters.
But you should clarify this again with your contractor.
A heating element is only needed if the heat pump can no longer handle the demand because it is extremely cold or if the heat pump is broken; otherwise, with correct sizing, you can always manage without it! And you really should!
RotorMotor schrieb:
Read the last sentence of your quote carefully.
I don’t know of any heat pump that receives subsidies but doesn’t have the appropriate built-in meters. Sure, but why make it simple when it can be complicated 8-)
netuser schrieb:
I’m not entirely sure if the electric heating element would have helped in our current situation, but I’ve been thinking about getting one for days.
A few days ago, the gas heating system in our rental house failed, so we’ve been without hot water for almost a week. It’s tough when showering, but I’ve often thought that an electric heating element could still help in such cases (heating failure) to at least warm the water, right? 🙂 The original poster wants to use photovoltaic electricity to power an immersion heater. That doesn’t make sense when the heat pump can do the same with three to four times the efficiency.
During a power outage, the inverter also shuts off the photovoltaic system. There are inverters with hybrid or island functions, but they don’t supply nearly enough power to heat 200–300 liters (50–80 gallons) of water.
Markus254 schrieb:
Exactly. The immersion heater is a backup solution for the heat pump. In the houses here in the neighborhood that have peak and off-peak tariffs, the utility company shuts off heating during peak times. You could run the immersion heater on the normal tariff then. You only experience shutdowns if you want to use heat pump electricity. Apart from that, nobody dies during a cutoff period. The house loses hardly any measurable heat as long as you don’t leave windows wide open. You first have to run out of hot water. I rarely take two or three baths during a cutoff period (1–2 hours) and then struggle with no hot water afterward ;-)
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nordanney6 Sep 2021 21:38guckuck2 schrieb:
No one dies during a blackout anyway. Who actually brought up the topic of blackout periods here?
The original poster didn’t ask about that at all. With photovoltaic systems and a separate heat pump electricity supply, it’s already a real challenge. And financially, it only makes sense in very few cases.
nordanney schrieb:
Who actually brought up the topic of restricted working hours?
The original poster didn’t ask about that. With photovoltaics and separate heat pump electricity, it’s already a real challenge. And it only makes financial sense in a few cases. Just read the quote from the OP that I responded to. ;-)
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