KOSTAL warranty extension
For our customers who would like to have their inverters protected for even longer, the 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.
The warranty extension can be ordered conveniently via the KOSTAL Solar Webshop - 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.