ᐅ Combining Photovoltaic Systems with Air-to-Water Heat Pump Heating and Domestic Hot Water
Created on: 5 Jun 2014 22:15
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hululu0Hello everyone,
We would like to install photovoltaic panels on the roof of our new build. However, our electrician said that it is not possible to combine photovoltaic with a heat pump because the heat pump uses a different meter than the photovoltaic system.
Can a professional confirm this or suggest a solution that is also cost-effective? :-)
Many thanks,
Jörg
We would like to install photovoltaic panels on the roof of our new build. However, our electrician said that it is not possible to combine photovoltaic with a heat pump because the heat pump uses a different meter than the photovoltaic system.
Can a professional confirm this or suggest a solution that is also cost-effective? :-)
Many thanks,
Jörg
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nordanney5 Jun 2014 23:47I don’t understand your electrician’s statement. Nowadays, there are heat pumps that work well in combination with photovoltaic systems.
Apart from that, we have both a heat pump and a photovoltaic system. Even though the two devices don’t communicate with each other, I consider it to be useful (at least in our case). We don’t have dedicated heat pump electricity; everything runs through a single meter. However, our overall self-consumption is quite high (loads of laundry with three small children, home office with various electrical devices).
Based purely on the annual yield, we are self-sufficient, but we have to feed electricity into the grid during the day and draw power in the evening and at night.
Apart from that, we have both a heat pump and a photovoltaic system. Even though the two devices don’t communicate with each other, I consider it to be useful (at least in our case). We don’t have dedicated heat pump electricity; everything runs through a single meter. However, our overall self-consumption is quite high (loads of laundry with three small children, home office with various electrical devices).
Based purely on the annual yield, we are self-sufficient, but we have to feed electricity into the grid during the day and draw power in the evening and at night.
You can install a separate meter for the heat pump electricity. This way, the heat pump is connected to this meter, and the rest goes through the household electricity meter.
You can either connect the photovoltaic system to the heat pump so that it generates electricity specifically for the heat pump, or to your household electricity supply.
We have the setup your electrician described: a heat pump meter and a household electricity meter to which the photovoltaic system is connected. Excess energy is fed back into the grid.
You can either connect the photovoltaic system to the heat pump so that it generates electricity specifically for the heat pump, or to your household electricity supply.
We have the setup your electrician described: a heat pump meter and a household electricity meter to which the photovoltaic system is connected. Excess energy is fed back into the grid.
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Bauexperte6 Jun 2014 10:57Hello Jörg,
If I were you, I would ask your utility provider how long they will continue to offer a separate meter for the air-to-water heat pump; from my perspective, this is limited, as the consumption costs will align with those of household electricity.
Best regards, Bauexperte
hululu0 schrieb:Without a storage system? We have photovoltaic systems with lithium-ion batteries; these also control the air-to-water heat pump.
we would like to install photovoltaic panels on the roof of our new build. However, our electrician said that it is not possible to combine photovoltaic with a heat pump because the heat pump has a different meter than the photovoltaic system.
If I were you, I would ask your utility provider how long they will continue to offer a separate meter for the air-to-water heat pump; from my perspective, this is limited, as the consumption costs will align with those of household electricity.
Best regards, Bauexperte
Hi Bauexperte,
I’ve checked, and you’re right. It’s no longer worthwhile to install an additional meter. I’ve attached my calculations!
What remains to make this more cost-effective is a storage system or a controller that increases self-consumption. Such a controller probably costs around 500€ (about 545 USD), and with a small storage system, the controller is likely included.
Do you have any documentation where you’ve evaluated the cost-effectiveness of the storage system?
Jörg
I’ve checked, and you’re right. It’s no longer worthwhile to install an additional meter. I’ve attached my calculations!
What remains to make this more cost-effective is a storage system or a controller that increases self-consumption. Such a controller probably costs around 500€ (about 545 USD), and with a small storage system, the controller is likely included.
Do you have any documentation where you’ve evaluated the cost-effectiveness of the storage system?
Jörg
You can decouple the domestic hot water from the heating heat pump and purchase a separate hot water heat pump, which is then controlled by the photovoltaic surplus. These units are available starting from 80 liters (for wall-mounted models) up to the standard 300-liter models. Prices start at 700 euros.
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