ᐅ Combination of air-to-air heat pump, air-to-water heat pump, solar thermal system, and photovoltaic system with storage
Created on: 29 Sep 2020 14:57
K
KevinHoehne
Hello everyone,
I hope I’m in the right subforum.
About my project:
My wife and I plan to build a new house (expected start spring 2021) with a KfW55 energy standard. The usable floor area will be approximately 209m² (2250 sq ft) plus a basement.
Our builder includes heating and domestic hot water via an air-to-water heat pump and an air-to-air heat pump, both with a fresh air system including a heat exchanger. Additionally, we decided on a 6 kWp photovoltaic system with a 6.5 kWh battery storage (available as a "spring offer" for about €10,000).
Since I’m generally someone who tries to avoid unnecessary costs (in this case electricity costs for hot water), I’ve been considering having a solar thermal system installed as well. Without the photovoltaic system, I expect savings of around €200 per year (about 800 kWh/year for hot water). If our household grows in the future, the savings would naturally increase.
In our last conversation with the architect, he was convinced that it would make more financial sense to increase the photovoltaic system to 8 kWp (additional cost approximately €5,000) instead of installing the solar thermal system. He couldn’t provide a price for the solar thermal system because it’s not listed in the price catalog, but I assume it would be a similar amount.
Now to my questions:
a) Does anyone have experience with similar energy system combinations?
b) Are there resources or services where one can have such calculations done?
Thank you in advance and best regards,
Kevin
I hope I’m in the right subforum.
About my project:
My wife and I plan to build a new house (expected start spring 2021) with a KfW55 energy standard. The usable floor area will be approximately 209m² (2250 sq ft) plus a basement.
Our builder includes heating and domestic hot water via an air-to-water heat pump and an air-to-air heat pump, both with a fresh air system including a heat exchanger. Additionally, we decided on a 6 kWp photovoltaic system with a 6.5 kWh battery storage (available as a "spring offer" for about €10,000).
Since I’m generally someone who tries to avoid unnecessary costs (in this case electricity costs for hot water), I’ve been considering having a solar thermal system installed as well. Without the photovoltaic system, I expect savings of around €200 per year (about 800 kWh/year for hot water). If our household grows in the future, the savings would naturally increase.
In our last conversation with the architect, he was convinced that it would make more financial sense to increase the photovoltaic system to 8 kWp (additional cost approximately €5,000) instead of installing the solar thermal system. He couldn’t provide a price for the solar thermal system because it’s not listed in the price catalog, but I assume it would be a similar amount.
Now to my questions:
a) Does anyone have experience with similar energy system combinations?
b) Are there resources or services where one can have such calculations done?
Thank you in advance and best regards,
Kevin
The need for scaffolding is determined by the roof height and pitch. The steeper and higher the roof, the more essential and expensive the scaffolding becomes. If you want to install on both sides of a gable roof, you will naturally need scaffolding on both sides.
The money saved can, for example, be invested in full black modules or a stylish inlay system for the modules.
The money saved can, for example, be invested in full black modules or a stylish inlay system for the modules.
Next year, there will be a new amendment to the Renewable Energy Act. According to the current status, a system size of either just under 20 kWp or clearly over 20 and less than 30 kWp makes sense.
Our system is planned to be installed in February 2021, originally with 72 modules and a 370 heat pump from IBC in full black design.
Unfortunately, I learned today that these modules probably won't be available in February, and now my solar installer is checking which alternatives are feasible.
It is not possible to say in general which modules should be used, as this depends on the size and type of the roof, its orientation, and potential shading.
In addition, “soft” factors such as the aesthetics of the modules or the overall appearance of the roof come into play.
The mounting method is also important here (flush-mounted systems versus traditional mounting with clamps).
Our system is planned to be installed in February 2021, originally with 72 modules and a 370 heat pump from IBC in full black design.
Unfortunately, I learned today that these modules probably won't be available in February, and now my solar installer is checking which alternatives are feasible.
It is not possible to say in general which modules should be used, as this depends on the size and type of the roof, its orientation, and potential shading.
In addition, “soft” factors such as the aesthetics of the modules or the overall appearance of the roof come into play.
The mounting method is also important here (flush-mounted systems versus traditional mounting with clamps).
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