How does a line inverter work

How a solar system works

How does a solar system work?

With a solar system, the radiation energy of the sunlight is converted into usable electricity. The solar modules on the roof catch the sun's rays with the help of the solar cells and thus produce direct current. The inverter then converts the direct current into alternating current, i. H. electric current, converted.

Solar power is the power that is generated in solar cells by the photovoltaic effect. There are no exhaust emissions in the production of electricity.

The graphic below shows how the solar system works with the placement of the most important elements in the house:

  1. Solar modules (on-roof)
  2. Solar modules instead of bricks (in-roof)
  3. Smart Energy control
  4. Inverter
  5. Fuse box / panel
  6. Boiler for hot water
  7. Battery storage
  8. E-charging station
  9. Heat pump

Image: Function of a solar system (including battery storage) in a single-family house

Until a few years ago, a lot of embodied energy was required to manufacture solar modules. Embodied energy describes the amount of energy that is required for the manufacture and provision of a product. In terms of energy, the solar system was only amortized after 10 years.

In the meantime, the production processes for solar modules have been significantly improved, so that the solar system is energetically amortized after 1.5 years. Calculated over the entire lifespan of a solar system of 30 years, a solar system produces 14 to 20 times more energy than is required for its production.

How a solar panel works

Solar panels can convert sunlight into electricity. This is made possible by the semiconductors (silicon) that conduct electricity. As soon as sunlight shines on the solar panel, electrons are excited there. The electrons then move through the layers of the solar module and on to the inverter. The electrons transport the electricity to where the energy is needed.

Depending on requirements, the energy goes directly to the end consumer (light bulb, PC, battery, etc.) where the electricity is available for later use.

Solar panels - also called solar modules - consist of many small solar cells. If many solar panels are connected to one another, one speaks of a solar system.

Construction of the photovoltaic system

In order to convert solar energy into usable electricity with the help of the solar system, the following important components are necessary:

Solar modules

The solar module - also known as the solar panel - converts solar energy into electricity. The solar panels consist of several layers and are mostly attached to the roof.


The task of the inverter is to convert direct current into normal alternating current. At the same time, it controls the entire system.

Electricity meter

A meter measures the electricity fed into the power grid and the electricity purchased from the grid.

Battery storage (optional)

The battery storage system stores excess solar power. It increases the proportion of self-consumption, so that electricity costs are reduced.

Smart Energy control (optional)

Our Smart Energy control system switches on the energy-intensive consumers when the solar power is available. This increases self-consumption, so that less external coal and nuclear power is required at the same time.

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Which solar system do I need?

When choosing the right solar system, you should take into account not only the required consumption, but also the size and the current condition of your roof. You can also choose between a rooftop and an in-roof system and different colors of the solar panels.

Consumption of household

The first thing to do is to determine the annual electricity consumption of your household. The solar system should at least cover the electricity consumption of the household.

Size of the roof area

The roof area determines how many solar modules and thus what maximum output can be installed. It is important to assemble the modules in such a way that the electricity consumption of your household is covered.


Required output of the photovoltaic system per household

The electrical output of a photovoltaic system is given in kWp (“Kilowatt peak”). In Switzerland, depending on the location and efficiency, an average of 800-1,300 kilowatt hours (kWh) can be generated per kWp per year. The following table shows the average power required for each size of household and the resulting size of the solar system.

Further selection criteria

"We generally recommend choosing the size of the photovoltaic system according to your consumption or a larger one."

Texture of the roof

A solar system has a lifespan of 30 years, i.e. H. the roof should be laid out for at least this time. If the roof is already porous or older than 40 years, an in-roof system is a good choice.

On-roof or in-roof

Rooftop systems are the most popular in Switzerland. The solar panels are mounted on a substructure, the original roof is retained. Rooftop systems are inexpensive and can be installed very quickly.

In the case of an in-roof system, the photovoltaic system replaces the roof covering. This variant can therefore be considered for old roofs that have to be renovated or for a new building. The solar panels are available in different colors. A particularly elegant look can be achieved by matching the colors. The in-roof system is approx. 20 percent more expensive than the on-roof system. However, you no longer need a roof covering.

Desired optics

In addition to classic silver-gray, Helion's solar panels are also available in anthracite and, on request, in other color levels.

All available solar panels at a glance>

Installation of a solar system

The installation costs are fully included in the price of the solar system.
We install the system with our experienced specialists - electricians, roofers, carpenters, plumbing, plumbers - from A to Z ourselves.
Depending on the size of the solar system, the installation takes between 2 days and a week.

Maintenance of a solar system

We pay attention to the highest quality when selecting components and assembling them. Our photovoltaic systems have an average service life of 30 years and are extremely low-maintenance. You receive a 20-25 year guarantee from the module manufacturer. Only the inverter should be replaced every 12 years.

Optionally, you can conclude a monitoring contract with Helion so that you are covered for the full 30-year service life. In addition, we guarantee you the energy yield for the first 10 years and thus ensure the long-term operation of your PV system (all details can be found in the terms and conditions).

More reasons for Helion>

At Helion you get a photovoltaic system of the highest quality at affordable prices. From as little as CHF 10,000 including subsidies and tax savings, you can become your own electricity producer and are therefore independent of electricity price adjustments. In addition, there is your positive contribution to the environment.

Get a non-binding offer now!

Configure your own system in minutes with our solar calculator and receive a concrete offer immediately:

Funding & tax deduction
Economy & energy balance

free of charge - uncomplicated - precise - non-binding

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