A
Ahrensburger28 Jun 2014 00:19Hello,
why does the large well-known developer build their KFW 55 houses (we like the promotional house V1 without any floor plan changes, except for the staircase, and with our additional ideas we still stay within our budget) only with an exhaust air heat pump (Nibe F 755)?
Is the Nibe system especially cost-effective for them, or is it also economically viable for the homeowner in the medium term?
What is the actual economic benefit of the 3.3 kWp photovoltaic system with the 2.8 kWh battery?
why does the large well-known developer build their KFW 55 houses (we like the promotional house V1 without any floor plan changes, except for the staircase, and with our additional ideas we still stay within our budget) only with an exhaust air heat pump (Nibe F 755)?
Is the Nibe system especially cost-effective for them, or is it also economically viable for the homeowner in the medium term?
What is the actual economic benefit of the 3.3 kWp photovoltaic system with the 2.8 kWh battery?
T
toxicmolotof28 Jun 2014 08:56I don’t know of any "red" property developer. But maybe a prefabricated house manufacturer.
You might want to familiarize yourself with the different terms to make your question more precise.
In my opinion, photovoltaic systems with battery storage are still uneconomical, regardless of their size. Considering a battery lifespan of 10–15 years, the only real argument in favor is environmental impact. However, even then, only if the production process is not included in the calculation.
Personally, I still like photovoltaic systems.
You might want to familiarize yourself with the different terms to make your question more precise.
In my opinion, photovoltaic systems with battery storage are still uneconomical, regardless of their size. Considering a battery lifespan of 10–15 years, the only real argument in favor is environmental impact. However, even then, only if the production process is not included in the calculation.
Personally, I still like photovoltaic systems.
A
Ahrensburger28 Jun 2014 09:09The larger red developer V..., mentioned here from time to time, has several model house parks, including in Bad Fallingbostel and Horneburg. These are not prefabricated houses.
The central question for us is whether the houses meeting KfW 55 standards really require "little" electricity to operate the exhaust air heat pump, or if electricity costs increase significantly during the heating season. Based on that, we are also considering whether to build a KfW 70 house with gas condensing technology with another local developer.
The central question for us is whether the houses meeting KfW 55 standards really require "little" electricity to operate the exhaust air heat pump, or if electricity costs increase significantly during the heating season. Based on that, we are also considering whether to build a KfW 70 house with gas condensing technology with another local developer.
B
Bauexperte28 Jun 2014 09:15Hello,
The promotional house you prefer is not really anything groundbreaking. Considering that all designs basically revolve around a maximum of five variations, it quickly becomes clear that the red competitor stays exclusively within his own design line.
Whether and when a photovoltaic system plus storage pays off (from my subjective point of view, without storage it’s completely uninteresting) should be calculated by the system installer specifically for your house. Note: this should be the installer, not the home seller or the red competitor. Only then—with full knowledge of all facts (including KfW support for the storage)—can you decide whether the additional costs are economically worthwhile for you.
Regards, Bauexperte
Ahrensburger schrieb:I have been wondering about this for years and can’t understand it; in my opinion, it doesn’t fit the overall concept of the red competitor at all. Moreover, the heat generator is only really effective in a true passive house, so it makes sense to reduce energy costs using a battery. You can find plenty of common experiences about the energy consumption of exhaust air heat pumps online—just not in the linked building diaries on the provider’s website ;-)
why does the large red builder only construct its KfW 55 houses (we like the promotional house V1 without any changes to the floor plan—except for the staircase—and with our additional requests we still stay within our budget) using exhaust air heat pumps (Nibe F 755)?
The promotional house you prefer is not really anything groundbreaking. Considering that all designs basically revolve around a maximum of five variations, it quickly becomes clear that the red competitor stays exclusively within his own design line.
Ahrensburger schrieb:We have also included lithium-ion batteries of different sizes in our portfolio; for our system, the manufacturer (Panasonic) guarantees 5,000 charge cycles, which roughly corresponds to 20 years. To be economically viable and achieve up to 70% energy independence, larger systems than the one you mentioned are recommended—especially since lithium-ion batteries have finally become affordable.
Is this system cost-effective for him, or economically viable for the homebuilder in the midterm? What are the actual economic benefits of the 3.3 kWp photovoltaic system with the 2.8 kWh battery?
Whether and when a photovoltaic system plus storage pays off (from my subjective point of view, without storage it’s completely uninteresting) should be calculated by the system installer specifically for your house. Note: this should be the installer, not the home seller or the red competitor. Only then—with full knowledge of all facts (including KfW support for the storage)—can you decide whether the additional costs are economically worthwhile for you.
Regards, Bauexperte
T
toxicmolotof28 Jun 2014 09:16One more time, slowly: Do you know what a developer does?
Does the developer also provide the land?
This will make a huge difference later on, even for other questions.
Also, when doing the calculations, make sure you are dealing with a professional expert, not a sales agent. The latter tend to present the numbers in a more favorable way.
Does the developer also provide the land?
This will make a huge difference later on, even for other questions.
Also, when doing the calculations, make sure you are dealing with a professional expert, not a sales agent. The latter tend to present the numbers in a more favorable way.
A
Ahrensburger28 Jun 2014 14:14The building plot is available. We are not purchasing a complete package that includes both the plot and the house.
The house will be built using a general contractor, and we only want to handle the parquet flooring and painting ourselves.
It seems to me that the sellers from V... provide lump-sum figures without knowing the plot in detail, even though their discussions appear customer-oriented. So far, I have not received figures based on calculated values for a KfW 55-standard house. Detailed questions are explained by the engineers—after the contract is signed?
Another provider reviewed implementation options according to the specified requirements and was approximately €25,000 to €30,000 (about $27,000 to $32,000) higher than the cost of a KfW 70-standard house, including some additional features.
The house will be built using a general contractor, and we only want to handle the parquet flooring and painting ourselves.
It seems to me that the sellers from V... provide lump-sum figures without knowing the plot in detail, even though their discussions appear customer-oriented. So far, I have not received figures based on calculated values for a KfW 55-standard house. Detailed questions are explained by the engineers—after the contract is signed?
Another provider reviewed implementation options according to the specified requirements and was approximately €25,000 to €30,000 (about $27,000 to $32,000) higher than the cost of a KfW 70-standard house, including some additional features.
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