The inverter converts the direct current of the solar modules into alternating current that the home grid and appliances can use. It also ensures optimal operation of the modules and supplies the data for monitoring. A distinction is made between string, hybrid and micro-inverters – the choice depends on roof, shading and battery plans.
Key points in brief
- The inverter is the active heart of the system and determines more about quality and comfort than the individual module.
- It converts DC into AC, optimises yield and monitors the system.
- Main types: string inverter (standard), hybrid inverter (battery-ready), micro-inverter (per module).
- Anyone who ever wants a battery is best served by a hybrid inverter.
- As an active component it lasts shorter than the modules – a replacement during the system's life is normal.
What tasks does the inverter have?
Solar modules supply direct current (DC). Sockets, household appliances and the public grid, however, work with alternating current (AC). The inverter is the translator in between – and does more than the pure conversion:
- Conversion of DC into AC, with a very high efficiency of its own.
- Yield optimisation: it ensures that the modules always run at their most powerful operating point, even with changing light.
- Monitoring: it supplies the data for monitoring – how much is being produced, whether there is a fault.
- Safety: in a grid outage it disconnects the system automatically, so no danger arises for people.
Because it works constantly, it is the component on which comfort and reliability are decided most.
What types are there?
| Type | Principle | Well suited for |
|---|---|---|
| String inverter | one central device for the whole system | most standard roofs |
| Hybrid inverter | string device with integrated battery connection | anyone who has or plans a battery |
| Microinverter | a small device per module | heavily shaded or complex roofs |
As of: July 2026.
The string inverter is the proven standard: one device processes the current of several modules connected in series. Reliable, attractively priced, the right choice for the typical single-family roof.
The hybrid inverter can additionally control a battery. Even those who don't want a battery today keep the door open with this variant – retrofitting later becomes simpler and cheaper. More at Hybrid inverter.
Micro-inverters sit under each individual module and convert its current directly. Their advantage shows with shading: if one module falls into shade, it doesn't drag the others down. The article String or micro-inverter? compares the approaches in detail.
How do I go about the selection?
Three questions lead to the right choice:
Do I have shading? Trees, chimneys, dormers or neighbouring buildings that temporarily shade individual module areas speak for module-level optimisation – i.e. micro-inverters or power optimisers on a string device.
Do I want a battery – now or later? If yes, the hybrid inverter is the logical choice. When retrofitting it spares a second device and duplicate installation effort.
How important are brand and service to me? The inverter is the component most likely to need attention at some point. An established brand with good service in Switzerland and clean warranty handling are worth more here than with the module. Which manufacturers differ and how is shown in the inverter comparison.
How long does an inverter last?
As the only permanently active component, the inverter lasts shorter than the modules – a guide value is around 10 to 15 years. A replacement during the system's life is therefore not a breakdown but planned for, and already accounted for in an honest profitability calculation. What a replacement costs and how to recognise the right time is covered in the article Replacing an inverter.
When systems produce a message years after construction, it almost always comes from the inverter – the modules themselves usually run without complaint. That's exactly why we advise not to save at the wrong end with this component and to pay attention to two things: a reachable service in Switzerland and monitoring that reports a fault before yield is lost unnoticed over weeks. A cheap inverter without a service connection can become more expensive in the event of a fault than the initial saving.
Frequently asked questions
Where is the inverter mounted?
Mostly indoors in a cool, well-ventilated spot – often in the basement, garage or utility room, near the meter cabinet. Protection from heat and good accessibility for service are important.
Does the inverter make noise?
Modern devices are quiet in operation; a slight hum is possible. With proper placement – not next to the bedroom – it is not an issue in everyday life.
Do I need an inverter per module?
No, only with micro-inverters. The usual string inverter supplies the whole system with a single device. Module-level solutions pay off mainly with shading.
Can I later upgrade a normal inverter to a battery?
Only to a limited extent – a pure string inverter needs an additional battery device for this. Anyone who doesn't rule out a battery therefore chooses a hybrid inverter from the start.
Is an expensive inverter worth the money?
It's not the price that decides but fit and service. A solid branded device with Swiss service connection is generally the sensible choice – expensive extra functions you never use, by contrast, are not.
Free initial consultation
The right inverter for your system.
We choose the device to suit your roof, your shading and your battery plans – with service you can reach. Free of charge and without obligation.
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Swissolar-certified specialist company · ESTI installation authorisation (Art. 14 NIV) · in Zurich since 2017 · over 150 systems completed · a personal answer from the specialist company, no call centre
Sources: EnergieSchweiz, Swissolar, manufacturer documentation.
Last updated: 9 July 2026 · Author: ecoEn editorial team
