As part of our new build, we plan to install a photovoltaic system on the roof. The roof area is approximately 160sqm (1,720 sq ft), with a pitch of 25 degrees, a gable roof with one side facing northeast and the other southwest. Since we are both civil servants and income from photovoltaic systems requires approval and may later be counted towards our pension, feed-in is not an option for us.
The system is intended solely to reduce our electricity consumption. We will have a ground-source heat pump with a borehole, a 300l (80 gallons) hot water storage tank, and a ventilation system for heating. The house is designed to meet KFW 55 standard (higher efficiency is no longer possible due to the basement).
Since I am home starting at midday, appliances such as the washing machine, dryer, dishwasher, and others will mainly be used during the day.
Additionally, we live in an area with above-average sunshine and fewer cloudy days, even in winter.
We do not want a battery storage system yet, even though this means we will occasionally export surplus electricity. Once batteries become more affordable, we plan to add one later.
How should the system be sized for our needs?
The system is intended solely to reduce our electricity consumption. We will have a ground-source heat pump with a borehole, a 300l (80 gallons) hot water storage tank, and a ventilation system for heating. The house is designed to meet KFW 55 standard (higher efficiency is no longer possible due to the basement).
Since I am home starting at midday, appliances such as the washing machine, dryer, dishwasher, and others will mainly be used during the day.
Additionally, we live in an area with above-average sunshine and fewer cloudy days, even in winter.
We do not want a battery storage system yet, even though this means we will occasionally export surplus electricity. Once batteries become more affordable, we plan to add one later.
How should the system be sized for our needs?
T
toxicmolotof2 Mar 2017 18:45Wonderful.... An ideal owner for a photovoltaic system with feed-in tariffs.
Or how high is the allowance?
Even if you use the full 10 kWp capacity, you will probably get no more than 1,000 euros (before depreciation) in compensation.
However, I am not an expert in civil service law.... You should have nothing to worry about for the first 20 years.
Or how high is the allowance?
Even if you use the full 10 kWp capacity, you will probably get no more than 1,000 euros (before depreciation) in compensation.
However, I am not an expert in civil service law.... You should have nothing to worry about for the first 20 years.
I have no knowledge of civil service law. But first, the photovoltaic system needs to generate taxable income. This is influenced by depreciation and other expenses related to the system. Then, the tax exemption for secondary income also comes into play.
The system size is mainly determined by how much you want to invest. Next, the question is how much can reasonably fit on the roof. There are also target capacity sizes that make more sense, for example, just under 7 kWp, since systems above 7 kWp require smart meters, which lead to additional costs. Ten kWp is another common "threshold," because systems larger than 10 kWp are subject to the Renewable Energy Act surcharge, making systems between 10 and 13 kWp rarely profitable. Above 13 kWp, there is more flexibility again.
A specialized solar installer would be your point of contact (not the local electrician and definitely not the energy provider).
The system size is mainly determined by how much you want to invest. Next, the question is how much can reasonably fit on the roof. There are also target capacity sizes that make more sense, for example, just under 7 kWp, since systems above 7 kWp require smart meters, which lead to additional costs. Ten kWp is another common "threshold," because systems larger than 10 kWp are subject to the Renewable Energy Act surcharge, making systems between 10 and 13 kWp rarely profitable. Above 13 kWp, there is more flexibility again.
A specialized solar installer would be your point of contact (not the local electrician and definitely not the energy provider).
A solar installer is the next step... I just don’t want to be completely clueless when I meet with one... Otherwise, they might sell me something and I wouldn’t know if it’s actually any good...
We mainly want to cover our own energy needs... So we don’t necessarily want to cover the entire roof...
We mainly want to cover our own energy needs... So we don’t necessarily want to cover the entire roof...
T
toxicmolotof2 Mar 2017 19:09I don’t see the 7 kWp limit as a big issue since smart meters will be implemented anyway.
If you have the space, go for the full 10 kWp or just slightly under. Feeding electricity back to the grid won’t make you rich, but in my experience, it won’t make you poor either. However, you will have more power available in winter (which, however, will not be sufficient with either 5 kWp or 10 kWp).
If you have the space, go for the full 10 kWp or just slightly under. Feeding electricity back to the grid won’t make you rich, but in my experience, it won’t make you poor either. However, you will have more power available in winter (which, however, will not be sufficient with either 5 kWp or 10 kWp).
Then aim for around 7 kWp. The system shouldn’t be unnecessarily small, as the cost per kWp decreases with larger installations, meaning very small systems are never cost-effective.
Have you planned for a heat pump?
The cost per kWp is approximately 1300 € net. Larger systems are cheaper per kWp, smaller ones more expensive.
Have you planned for a heat pump?
The cost per kWp is approximately 1300 € net. Larger systems are cheaper per kWp, smaller ones more expensive.
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