More and more homeowners want to produce cheap solar electricity and make themselves independent of electricity price fluctuations or supply bottlenecks with a photovoltaic system. In 2021, 43 percent more solar power systems were installed than in 2020. If you are also considering this, you should clarify whether your house and your household are suitable before planning a photovoltaic system.
Solar radiation has a significant influence on solar power production and depends on two factors: Roof orientation and roof pitch:
The rule of thumb is simple: 1 kilowatt peak of power for 1000 kilowatt hours of annual electricity consumption. Kilowatt peak or kWp is the electrical power that solar modules generate under laboratory conditions. With 1 kWp, you produce about 900 kilowatt hours of electricity per year. An average single-family house consumes about 5000 kilowatt hours per year. 6 kWp would be sufficient for this. With 10 kWp you produce about 9000 kilowatt hours per year and are equipped for higher electricity consumption. For example, if you buy an electric car and install an e-charging station. For 1 kWp of power, you currently need about 7 square metres of solar modules, which means about 70 square metres for 10 KWP.
A photovoltaic system with 10 kilowatt peak output costs about 25,000 Swiss francs. From the federal government you receive the performance-based small one-off payment (KLEIV), which amounts to up to 30 per cent of your investment costs, in our example about 4,000 Swiss francs. In addition, in every canton except Lucerne and Graubünden, you are allowed to deduct 100 percent of your net investment costs (investment costs minus one-off payment) from your taxable income if the system is subsequently installed. The bottom line is that our 10 kWp photovoltaic system for an average house with average electricity consumption costs around 20,000 Swiss francs, depending on income and tax progression.
Whether a photovoltaic system is worthwhile depends above all on your own consumption. You can increase your own consumption with a battery or electricity storage system. Self-produced solar electricity costs less than electricity from the grid. In Winterthur, for example, you pay 12 centimes more for a kilowatt hour of electricity than you receive for a kilowatt hour of solar electricity that you feed into the public grid. With an electricity or battery storage system, you get more out of your photovoltaic system: You ...
If you own or want to buy an electric car, an e-charging station is a must. Of course, you could charge the car at a household socket. But that is dangerous because cables or junctions in junction boxes can heat up and catch fire under full charging power. A wallbox is safer, faster and more convenient. An average single-family home consumes about 5000 kilowatt hours per year (see "Calculating the size of the photovoltaic system"), an average electric car about 15 kWh/100 kilometres. If you drive 15,000 kilometres a year, you need about 7250 kWh for the house and the car. A 10 kWp photovoltaic system is easily sufficient for this and still has sufficient reserves.
As soon as you have decided to install a photovoltaic system, you should commission a solar professional with the planning. He will clarify how high your energy consumption is, how it could change in the next few years due to an electric car, a sauna or a heat pump and how powerful the system would have to be. On this basis, the solar builder or installer calculates the economic efficiency and recommends solar modules, inverters and battery storage. Photovoltaic systems for single-family or two-family homes are usually planned by the installation companies. For larger projects such as apartment buildings, for example a condominium owners' association, there are special planning offices.
Leave the installation to a solar professional. Installing modules is easy if you don't suffer from vertigo, but connecting modules and inverters correctly and accurately requires experience. In our partner network you will find certified solar builders and solar installers who you can contact with just a few clicks. Ask them how many photovoltaic systems they have already installed and ask them for reference projects you can look at. Decide on an installation company from the region that offers you a quick on-site service if you should ever have any problems.
The application for the one-off payment for photovoltaic systems with an output of less than 100 kilowatts may only be submitted after the system has been commissioned. The installer can apply for the one-off payment at www.pronovo.ch. Pronovo is responsible, among other things, for handling the federal government's renewable energy subsidy programmes. If you want to feed surplus solar power into the electricity grid, a connection application to the energy supplier is usually sufficient.
Small mistakes can be costly. Therefore, when planning your photovoltaic system, avoid these 5 mistakes that others have already made:
Do you want to produce cheap solar power, do something for the environment and make yourself independent of rising energy or raw material prices? A photovoltaic system is an investment in the future that pays off ecologically and economically. Use our solar calculator to find out whether your house roof is suitable, how much a photovoltaic system costs and how much subsidy money you will receive. However, you will probably need some patience: many solar professionals are currently very busy because the demand for photovoltaic systems is higher than ever before.