Hello,
why does the big red developer build his KfW 55 houses (the promotional house V1 pleases us without floor plan changes (except for the stairs) and with our additional ideas we still stay within our budget) only with exhaust air heat pump (Nibe F 755)?
I have been wondering about that for years and I cannot understand it; in my opinion, it also does not fit the overall concept of the colleague, the red competitor. Besides, the heat generator is only useful in a real passive house; therefore, it is obvious to reduce the consumption costs with a battery. Common experiences regarding the operating costs of exhaust air heat pumps can be found widely on the internet; just not in the linked construction diaries on the provider’s page ;-)
The promotional house you favor is not really something overwhelmingly new. Considering that the architectures all revolve around at most 5 designs anyway, it quickly becomes clear that the red colleague moves exclusively within his design line.
Is the system so cheap for him or also economically viable for the home builder in the medium term?
What do the 3.3 kWp photovoltaic system with the 2.8 kWh battery actually bring me economically?
We have also included lithium-ion batteries in different sizes in our offer; in our system the manufacturer (Panasonic) guarantees 5000 charge cycles, which corresponds to about 20 years. To be economical, or up to 70% independent, larger systems than the system size you mentioned are recommended; especially because lithium-ion batteries have finally become affordable.
Whether — and from when — a photovoltaic system including storage pays off (from my subjective perspective totally uninteresting without storage) should be calculated by the system installer for the specific house. Note: the system installer and not the home salesperson or the red competitor colleague. Only then can you — knowing all facts (including the subsidy of the storage by the KfW) — decide whether the additional costs are economically interesting for you.
Rhenish greetings