https://www.vpsolar.com/en/kostal-extends-the-warranty-on-all-inverters-up-to-20-kw-to-10-years/
KOSTAL extends the warranty on all inverters up to 20 kW to 10 years
Jun 5, 2023 - KOSTAL Solar Electric has announced that starting from April 2022 it will extend the warranty to 10 years for all inverters up to 20 kW.
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