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Heidi196528 Apr 2020 20:42We are planning a new build and want to heat the house using an air-to-water heat pump. We aim to cover the electricity demand for this system, as well as our other electricity needs, as much as possible with our own photovoltaic system and storage. In winter, when the sun is low, shading may occur due to a park located opposite the house. The house’s gable ends face north and south; therefore, the roof surfaces face east and west.
We obtained quotes from two professional companies. They offer completely different systems in terms of capacity and scope. Now we are quite uncertain. What would be the right solution for our property? We want to choose the right size for our house.
Company A offers:
Novelan Package LADV 9-HSDV 12
Package BYD Battery-Box Premium HVS 5.1 with Fronius Symo Hybrid 5.0-3-S
15 Trina Solar photovoltaic modules 340 TSM-DE06M.08
Company B offers:
Buderus Logaplus WLW196 iAR-9 WLW196i-8ART190, 1 heating circuit, P120.5S-B Logaplus heat pump package WLW196 iAR-9 with Logatherm WLW196i-8 ART190, reversible air-to-water heat pump including tower and buffer tank for monoenergetic operation.
Photovoltaic system with 9.9 kWp total capacity; brand: Q-Cells 30 x QPEAK 330 black heat pump
Home power system E3/DC S10 E All-in-One 6.50 kWh (expandable up to 19.5 kWh)
The building is a new detached house with a pitched roof and external dimensions of 14.50 m x 10 m (48 feet x 33 feet). On the ground floor there is an apartment for 2 people. The attic will initially be set up as a secondary apartment for 1 person with approx. 42 sqm (452 sq ft) of living space; the rest will remain as an attic. The total usable area of the attic is 80 sqm (861 sq ft).
A wood stove will be installed in the hallway. Electricity consumption is based on average values.
We obtained quotes from two professional companies. They offer completely different systems in terms of capacity and scope. Now we are quite uncertain. What would be the right solution for our property? We want to choose the right size for our house.
Company A offers:
Novelan Package LADV 9-HSDV 12
Package BYD Battery-Box Premium HVS 5.1 with Fronius Symo Hybrid 5.0-3-S
15 Trina Solar photovoltaic modules 340 TSM-DE06M.08
Company B offers:
Buderus Logaplus WLW196 iAR-9 WLW196i-8ART190, 1 heating circuit, P120.5S-B Logaplus heat pump package WLW196 iAR-9 with Logatherm WLW196i-8 ART190, reversible air-to-water heat pump including tower and buffer tank for monoenergetic operation.
Photovoltaic system with 9.9 kWp total capacity; brand: Q-Cells 30 x QPEAK 330 black heat pump
Home power system E3/DC S10 E All-in-One 6.50 kWh (expandable up to 19.5 kWh)
The building is a new detached house with a pitched roof and external dimensions of 14.50 m x 10 m (48 feet x 33 feet). On the ground floor there is an apartment for 2 people. The attic will initially be set up as a secondary apartment for 1 person with approx. 42 sqm (452 sq ft) of living space; the rest will remain as an attic. The total usable area of the attic is 80 sqm (861 sq ft).
A wood stove will be installed in the hallway. Electricity consumption is based on average values.
D
Daniel-Sp28 Apr 2020 21:47Hello,
I increasingly get the impression that the heating installers want to force us to design our houses around the heat pumps they offer!
Both quotes lack the statement that the heat pump can only be offered after a heating load calculation is available. So, in my opinion, both offers are inadequate.
I am not familiar with Buderus. The Novelan is at least a modulating heat pump, but it might be oversized in terms of capacity...
So, back to square one and first commission the heating load calculation. This is absolutely necessary for a heat pump; with gas heating, you can usually afford to oversize roughly.
Others can write more about photovoltaics with storage. However, storage systems mostly seem like an expensive hobby rather than economically sensible.
Do NOT integrate the stove into the hydraulic system; no water jacket. Look for a stove with a large thermal mass, such as a masonry heater, otherwise the house will overheat. The stove should also not be chosen roughly; good stove builders can calculate this.
Regards, Daniel
I increasingly get the impression that the heating installers want to force us to design our houses around the heat pumps they offer!
Both quotes lack the statement that the heat pump can only be offered after a heating load calculation is available. So, in my opinion, both offers are inadequate.
I am not familiar with Buderus. The Novelan is at least a modulating heat pump, but it might be oversized in terms of capacity...
So, back to square one and first commission the heating load calculation. This is absolutely necessary for a heat pump; with gas heating, you can usually afford to oversize roughly.
Others can write more about photovoltaics with storage. However, storage systems mostly seem like an expensive hobby rather than economically sensible.
Do NOT integrate the stove into the hydraulic system; no water jacket. Look for a stove with a large thermal mass, such as a masonry heater, otherwise the house will overheat. The stove should also not be chosen roughly; good stove builders can calculate this.
Regards, Daniel
The first photovoltaic system is definitely too small. The second one is probably too small for your roof as well. How large are the roof surfaces? Are there dormers, skylights, or similar features?
Why are they offering the battery storage with the photovoltaic system? Did you ask about that? One kilowatt-hour from the battery will cost you around 40 to 50 cents. This is far too expensive for the foreseeable future. Since you have a heat pump, you can store excess energy in the building’s concrete mass during winter by having the heat pump work more when photovoltaic power is available. In summer, you feed energy back into the grid and receive remuneration, which is still above your electricity production costs. However, watch out for the 52GWh limit.
There is a dedicated forum for photovoltaic systems. Look it up and read the FAQs there. This way, you’ll know much better what to pay attention to.
Why are they offering the battery storage with the photovoltaic system? Did you ask about that? One kilowatt-hour from the battery will cost you around 40 to 50 cents. This is far too expensive for the foreseeable future. Since you have a heat pump, you can store excess energy in the building’s concrete mass during winter by having the heat pump work more when photovoltaic power is available. In summer, you feed energy back into the grid and receive remuneration, which is still above your electricity production costs. However, watch out for the 52GWh limit.
There is a dedicated forum for photovoltaic systems. Look it up and read the FAQs there. This way, you’ll know much better what to pay attention to.
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