ᐅ Photovoltaic System and Air-to-Water Heat Pump – Profitability for a Single-Family Home Built to KfW 55 Energy Efficiency Standard
Created on: 11 Jan 2022 23:19
M
Maxwell8
Hello,
we are building a fairly large KFW55EE house with external dimensions of approximately 10x14m (33x46 feet) and a roof pitch of 15° (roof surfaces facing north and south).
We have a lot of window area (100m2 (1,076 sq ft)) and expect an energy consumption of about 7-9k kWh per year due to the size.
Heating is provided by underfloor heating with the Tecalor THZ 504 air-to-water heat pump.
Feed-in tariffs are no longer significant, but the electricity price is currently 45 cents/kWh.
We would have to finance the photovoltaic system ourselves because there is no sufficient budget left.
> From a profitability perspective, does a photovoltaic system make sense in our situation?
> What size and costs should we expect?
> Should it be installed directly or should we first prepare with conduits?
> We also have an attached 6x6m (20x20 feet) flat-roof garage on the east side. Would adding photovoltaic panels there be beneficial?
I will, of course, speak with companies but would like to gather some opinions beforehand.
Thank you in advance. 🙂
we are building a fairly large KFW55EE house with external dimensions of approximately 10x14m (33x46 feet) and a roof pitch of 15° (roof surfaces facing north and south).
We have a lot of window area (100m2 (1,076 sq ft)) and expect an energy consumption of about 7-9k kWh per year due to the size.
Heating is provided by underfloor heating with the Tecalor THZ 504 air-to-water heat pump.
Feed-in tariffs are no longer significant, but the electricity price is currently 45 cents/kWh.
We would have to finance the photovoltaic system ourselves because there is no sufficient budget left.
> From a profitability perspective, does a photovoltaic system make sense in our situation?
> What size and costs should we expect?
> Should it be installed directly or should we first prepare with conduits?
> We also have an attached 6x6m (20x20 feet) flat-roof garage on the east side. Would adding photovoltaic panels there be beneficial?
I will, of course, speak with companies but would like to gather some opinions beforehand.
Thank you in advance. 🙂
driver55 schrieb:
Per module, square meter, or “football field,” right? 🙂 In my opinion, always per kWp (kilowatt peak).
(Too few words)
Mahri23 schrieb:
Currently, our photovoltaic system produces 540 watts under a completely overcast sky (with about 13 kWp). The house, with an air-to-water heat pump, requires just under 800 watts. 😉Then it must be even cloudier here than with you: right now, only 100 W (9.1 kWp) are coming from the roof.
Over time, you get pretty good at estimating the current output just by looking out the window. 😉
opalau schrieb:
Over time, you get pretty good at estimating the current yield just by looking out the window.That's correct. At the moment, it is also fluctuating a lot. Well, we're waiting for sunshine tomorrow or the day after. 🙂
I’m currently stuck with the planning as well, but without any guidance, it just takes time. Right now, for example, I don’t even know which studs I need :-) but that will come.
I also have access to my friend’s system, which today generated 10.2 kWh from a 9.9 kWp system.
And once you’re done, all the knowledge you’ve gained is no longer needed.
I also have access to my friend’s system, which today generated 10.2 kWh from a 9.9 kWp system.
And once you’re done, all the knowledge you’ve gained is no longer needed.
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