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KOSTAL warranty
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The KOSTAL warranty for more peace of mind

Extend the warranty period for your inverter and wallbox free of charge. Activate your device on our online KOSTAL Solar shop.

Smart Warranty

The Smart Warranty extends the warranty period of the KOSTAL inverters and wallboxes free of charge. All that is required is a one-time activation in our "KOSTAL Solar Webshop" by the installer. Activation is uncomplicated and possible within the first 6 months after initial commissioning.

It is that simple:

Step 1: Log in to the KOSTAL Solar Terminal
Step 2: Click on the Smart Warranty tile
Step 3: Enter system and location data
Step 4: Activate warranty

Done! You will receive the warranty certificate immediately by e-mail.

Smart Warranty plus

KOSTAL Solar Electric is extending its warranty to 10 years for all inverters up to 20 kW with a commissioning date of 1 April 2022.

With the Smart Warranty plus, you also receive a material warranty from the sixth year of operation. This means that, including the statutory warranty, the new Smart Warranty plus provides a total warranty period of 10 years.

Important: In order to benefit from Smart Warranty plus, you will also need to register in the KOSTAL Solar Portal.

At a glance:

1st - 5th year Smart Warranty 6th - 10th year Smart Warranty plus*  KOSTAL warranty extension**
KOSTAL inverters up to 20 kW:                   ✓                      ✓                  X
KOSTAL inverters > 20 kW                   ✓                      X                  ✓
                  ✓                      X                  X


*) as of initial commissioning date of 01.04.2022
**)warranty can be extended by 5 years within the first two years from the date of purchase

KOSTAL warranty extension

For our customers who would like to have their inverters protected for even longer, the fee-based KOSTAL warranty extension offers an additional extension option. Within the first two years, the warranty period can be extended by a further 5 years from the date of purchase by your installer.

The warranty extension can be ordered conveniently via the KOSTAL Solar Webshop by your installer - easily and quickly, around the clock and even at weekends. You will receive the warranty certificate just as quickly and easily by e-mail. To be able to order the KOSTAL warranty extension, the Smart Warranty must be activated in the KOSTAL Solar Webshop for the respective inverter.

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