Bien-Zenker9 May 2018 15:26Living off the grid. Never paying for electricity and rent again. This is the dream of many of our homebuilding families. We always recommend including a photovoltaic system. Clean electricity is definitely a great benefit—especially when it is self-generated.
Of course, adding a photovoltaic system increases the overall budget for your home construction project. In the long run, it pays off. But is that really the case?
What has been your experience? Are you truly living energy self-sufficient?
Of course, adding a photovoltaic system increases the overall budget for your home construction project. In the long run, it pays off. But is that really the case?
What has been your experience? Are you truly living energy self-sufficient?
T
toxicmolotof9 May 2018 15:35Energy self-sufficient? 100% I want to see that system.
Bien-Zenker schrieb:
Do you really live energy self-sufficiently? You are self-sufficient if you do not have any utility connections to your house.
M
Mastermind19 May 2018 23:12I think the word "self-sufficient" is poorly chosen.
A more accurate term would be:
Energy costs covered by a photovoltaic system.
A photovoltaic system consists of self-consumption, ranging from 15-35%, and feeding electricity into the grid.
Together, these usually result in zero energy costs.
The investment itself is typically recouped within 8-10 years at a reasonable system price. After that, you generate a surplus until the end of the 20-year service life.
We have a 9.85 kWp system on our roof. Our previous electricity consumption (household + heating with an old air-source heat pump) was around 7,000-8,000 kWh per year.
The system generates nearly 10,000 kWh of electricity annually.
With the photovoltaic system, we can cover almost 30% of the former 8,000 kWh electricity consumption through self-consumption—about 2,400 kWh.
At the current electricity price of €0.25 (about $0.25) per kWh, this saves us nearly €600 ($600) per year.
For the remaining 7,600 kWh fed into the grid, we receive a feed-in tariff of €0.123 (about $0.12) per kWh. This corresponds to nearly €900 ($900) in compensation per year.
The additional 5,600 kWh of electricity needed from the grid still costs me around €1,400 ($1,400).
This means I am slightly over €100 ($100) in profit per year.
I have not included the tax aspects in this simplified calculation.
A modern photovoltaic system costs roughly €1,100 to €1,300 ($1,100 to $1,300) per kWp (net) starting from 5 kWp.
A more accurate term would be:
Energy costs covered by a photovoltaic system.
A photovoltaic system consists of self-consumption, ranging from 15-35%, and feeding electricity into the grid.
Together, these usually result in zero energy costs.
The investment itself is typically recouped within 8-10 years at a reasonable system price. After that, you generate a surplus until the end of the 20-year service life.
We have a 9.85 kWp system on our roof. Our previous electricity consumption (household + heating with an old air-source heat pump) was around 7,000-8,000 kWh per year.
The system generates nearly 10,000 kWh of electricity annually.
With the photovoltaic system, we can cover almost 30% of the former 8,000 kWh electricity consumption through self-consumption—about 2,400 kWh.
At the current electricity price of €0.25 (about $0.25) per kWh, this saves us nearly €600 ($600) per year.
For the remaining 7,600 kWh fed into the grid, we receive a feed-in tariff of €0.123 (about $0.12) per kWh. This corresponds to nearly €900 ($900) in compensation per year.
The additional 5,600 kWh of electricity needed from the grid still costs me around €1,400 ($1,400).
This means I am slightly over €100 ($100) in profit per year.
I have not included the tax aspects in this simplified calculation.
A modern photovoltaic system costs roughly €1,100 to €1,300 ($1,100 to $1,300) per kWp (net) starting from 5 kWp.
C
cybergnom10 May 2018 12:15To be honest, I don’t understand your calculation.
You pay €1,400 and receive €900.
That means you have €500 in costs per year.
You are currently quite far from breaking even.
You pay €1,400 and receive €900.
That means you have €500 in costs per year.
You are currently quite far from breaking even.
He saves 600€ through self-consumption and receives 900€ per year in feed-in tariffs. He spends 1,400€ on purchased electricity. That results in a 100€ profit.
However, this calculation is purely idealistic, as is the whole topic of energy self-sufficiency.
The only crucial factor is the return on investment of the photovoltaic system itself, which can easily reach 5%. The profit actually comes from the purchase price—that is, buying from a specialist rather than from the local electrician (or from the home builder or utility company).
However, this calculation is purely idealistic, as is the whole topic of energy self-sufficiency.
The only crucial factor is the return on investment of the photovoltaic system itself, which can easily reach 5%. The profit actually comes from the purchase price—that is, buying from a specialist rather than from the local electrician (or from the home builder or utility company).
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