The right size of your private solar system - How to determine the optimum system size
The right size of your private solar system - How to determine the optimum system size
One of the key questions that homeowners should ask themselves before installing a photovoltaic system is: What size should my solar system be in order to optimally cover my electricity needs? And how do I calculate the ideal kWp output of my photovoltaic system? The correct dimensioning of a solar system is crucial in order to achieve maximum efficiency and optimise costs at the same time. A correctly dimensioned photovoltaic system ensures that you maximise your own consumption, make optimum use of the feed-in tariff and secure the long-term profitability of your investment.
Important factors when dimensioning a solar power system
The optimum size of your solar system depends on several individual factors. To determine the correct output in kWp, you should consider the following points:
1. electricity consumption: your household's annual electricity consumption is the most important starting point. An average household consumes around 3,000 to 5,000 kWh per year. As a rule of thumb: Annual electricity consumption × 2.5 = recommended kWp output. Example: 4,000 kWh consumption results in a recommended system size of approx. 10 kWp.
2. output of the solar system (kWp): The output of a photovoltaic system is measured in kilowatt peak (kWp), with 1 kWp representing the maximum output under ideal conditions. A solar system with 1 kWp supplies an average of 900 to 1,100 kWh of electricity per year in Germany.
3. roof area and orientation: Your roof area and the orientation of the roof play an important role in the dimensioning of the solar system. A south-facing roof is ideal as it is exposed to the most sunlight. With an east-west orientation or limited roof area, you may need to adjust the size of the system. - Space requirement: A solar system with 1 kWp requires around 6-8 m² of roof space. This can vary depending on the module type and roof pitch selected.
4. self-consumption and storage technology: If you want to achieve a high level of self-consumption, you should also consider using an electricity storage system. With a battery storage system, you can store surplus solar power and also use it at times when there is no sun (e.g. at night). This allows you to increase your own consumption from around 30 % to up to 70 %.
5. future changes in electricity demand: Also think about potential changes in your electricity needs, such as buying an electric car or installing a heat pump. These devices require additional energy, so it may make sense to size the photovoltaic system for a higher electricity demand.
Calculating the optimum size of your solar system - how it works
Calculating the right size of your photovoltaic system is done in several simple steps:
1. determine your electricity consumption:
Start by determining your annual electricity consumption. You can find this information on your last electricity bill. Also take into account possible future changes, e.g. due to the use of an electric car.
2. calculation of the kWp output: As a rule of thumb: annual electricity consumption × 2.5 = recommended kWp output. Example: With an electricity consumption of 4,000 kWh per year, a system size of around 10 kWp is recommended.
3. checking the roof surface: Make sure that your roof surface offers sufficient space for the required number of modules. A 10 kWp system requires around 60 to 80 m² of roof space.
4. planning a storage unit: If you want to increase your own consumption, we recommend installing a battery storage unit. This allows you to store surplus solar power and use it at a later date.
5. use our solar calculator: To calculate the exact size of your PV system, you can easily use our solar calculator.
Why is the right size important?
Choosing the right size for your photovoltaic system has a direct impact on its efficiency and profitability. A system that is too small may not produce enough electricity to cover your needs, while an oversized solar system will result in unnecessary investment costs. An optimally sized solar system ensures maximum efficiency and profitability and helps you to reduce your energy costs in the long term.
Summary
Sizing your photovoltaic system is a crucial step on the way to greater energy self-sufficiency and a more sustainable energy future. Use our solar calculator to calculate the ideal system size quickly and easily.
Start now and calculate the ideal size of your solar system!
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