ᐅ Installing a Photovoltaic System with an Air-to-Water Heat Pump?
Created on: 2 Apr 2022 14:05
H
hauskauf1987
Hello everyone,
We recently purchased a house from the developer, and the selection appointment is coming up soon.
Basically, we plan to stick mostly to the "standard" options due to our budget.
The house is equipped with an air-to-water heat pump. In the special requests catalog, there is a photovoltaic system listed for 10kW.
As a layperson, I have the following questions:
- Should we have it installed? Will our electricity then be free in the future?
- How are these systems subsidized or supported?
- Does it make sense to install one?
Thanks in advance for your help.
We recently purchased a house from the developer, and the selection appointment is coming up soon.
Basically, we plan to stick mostly to the "standard" options due to our budget.
The house is equipped with an air-to-water heat pump. In the special requests catalog, there is a photovoltaic system listed for 10kW.
As a layperson, I have the following questions:
- Should we have it installed? Will our electricity then be free in the future?
- How are these systems subsidized or supported?
- Does it make sense to install one?
Thanks in advance for your help.
@[B]i_b_n_a_n
Well, then name a mistake?
So far, you’ve only made a false claim, because Andreas also achieves the same COP with the split air conditioning units as with the air-source heat pump.
And he clearly states when he will switch back to his old oil heating system.
He also confirms to Prof. Quaschning that large systems only pay off if done as DIY.
Here, there is already a note about correspondingly large battery storage systems.
This is confirmed by an engineer colleague of mine; look up "Energiesparkommissar,"
who calculates everything with source references just like Andreas does on the topic of photovoltaics.
This is about concrete calculation values and benefits, not emotions.
Watching countless videos is one thing, understanding what is being said is something else 🙂
Well, then name a mistake?
So far, you’ve only made a false claim, because Andreas also achieves the same COP with the split air conditioning units as with the air-source heat pump.
And he clearly states when he will switch back to his old oil heating system.
He also confirms to Prof. Quaschning that large systems only pay off if done as DIY.
Here, there is already a note about correspondingly large battery storage systems.
This is confirmed by an engineer colleague of mine; look up "Energiesparkommissar,"
who calculates everything with source references just like Andreas does on the topic of photovoltaics.
This is about concrete calculation values and benefits, not emotions.
Watching countless videos is one thing, understanding what is being said is something else 🙂
D
Deliverer2 Apr 2022 19:52Sure, getting upset about low returns, but then buying batteries. 😀
D
Deliverer2 Apr 2022 20:13parcus schrieb:
@i_b_n_a_n
This is also confirmed by an engineer colleague of mine—check out "Energiesparkommissar," who calculates everything with source references just like Andreas does on the topic of photovoltaics. Neither he nor Schmitz will manage to show that a small system with storage is more cost-effective than a large one without storage. It is clear that, for Schmitz, both the system and the storage are economical when self-built. However, very few people do this.
If a calculation ever suggests that a small system might be practical, it means the current electricity consumption (including fossil heating and mobility) was incorrectly extrapolated to future use. Over the lifetime of the system, everyone will have a heat pump and an electric car. Both of these factors, by the way, make storage less profitable.
Regarding Quaschning: He also says that storage is not economical and his roof is fully equipped. However, he does not oppose storage because he knows that the "good feeling of higher self-consumption" encourages more photovoltaic installation. Also, we will need storage in 10 years, so it does no harm if the industry is well established by then.
Well, I’m going to step out now, unless there are specific questions from the original poster. I’ve said everything I wanted to; hopefully, this encourages some independent research. Sources can be requested from me by private message if anyone is interested. After all, no one has to take my word for it. 😉
parcus schrieb:
@i_b_n_a_n
Well then, can you name a single mistake?Sorry, can you please just stop? You quote incorrectly, don’t read properly, and then talk nonsense. I wrote, "I’ve watched countless videos by Schmitz and have never seen any 'mistakes'." So you want me to show you mistakes that I never saw? I’m out of here, especially since there are better forums for photovoltaic questions :p
I only brought up DIY systems because of your claim that a larger system is always better. This discussion is not about DIY, and I agree with you on that.
Your other claim is equally unprofitable: a small system with a battery compared to a large system without a battery, if you cannot use the electricity yourself and are forced to sell it for a few cents or receive nothing at all.
However, this is not about a photovoltaic system with a battery, but only about the size of the photovoltaic system. Generally, a small 30m² (approximately 320 square feet) photovoltaic system is profitable. A larger system is only beneficial if it can be used for services unrelated to the building, such as charging an electric vehicle that stays at home for several days. This requires more surface area than a typical residential building can offer. (The efficiency of photovoltaic systems is too low for this purpose.) Or possibly if there are tenants to whom the electricity can be sold.
It is clear that policymakers want many people to invest in these systems, preferably with batteries, contributing to a decentralized energy supply. However, an investor should still expect a reasonable return from selling the electricity, which current feed-in tariffs do not provide.
New funding programs are expected around Easter, so it remains to be seen whether photovoltaic systems and batteries will explicitly be included in support for residential construction.
Furthermore, even as a professional in an industrialized country, one should not forget that the goal is not to consume three times as much energy as an average household currently does, but to save energy. Of course, some can afford to act this way and do so for ecological reasons alone. For many, economic profitability is currently crucial.
It should also be noted that all forecasts are uncertain, as no one can currently predict price developments, including electricity prices.
Your other claim is equally unprofitable: a small system with a battery compared to a large system without a battery, if you cannot use the electricity yourself and are forced to sell it for a few cents or receive nothing at all.
However, this is not about a photovoltaic system with a battery, but only about the size of the photovoltaic system. Generally, a small 30m² (approximately 320 square feet) photovoltaic system is profitable. A larger system is only beneficial if it can be used for services unrelated to the building, such as charging an electric vehicle that stays at home for several days. This requires more surface area than a typical residential building can offer. (The efficiency of photovoltaic systems is too low for this purpose.) Or possibly if there are tenants to whom the electricity can be sold.
It is clear that policymakers want many people to invest in these systems, preferably with batteries, contributing to a decentralized energy supply. However, an investor should still expect a reasonable return from selling the electricity, which current feed-in tariffs do not provide.
New funding programs are expected around Easter, so it remains to be seen whether photovoltaic systems and batteries will explicitly be included in support for residential construction.
Furthermore, even as a professional in an industrialized country, one should not forget that the goal is not to consume three times as much energy as an average household currently does, but to save energy. Of course, some can afford to act this way and do so for ecological reasons alone. For many, economic profitability is currently crucial.
It should also be noted that all forecasts are uncertain, as no one can currently predict price developments, including electricity prices.
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