Solar panels generally come with two warranties: The product warranty covers the equipment and typically guarantees at least 10-12 years without fail, and the power or performance warranty often guarantees at least 90% production at 10 years and 80% at 25 years. [pdf]
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If the product you sold turns out to be faulty— or doesn't look or work as advertised — within the timeframe of the legal guarantee, you are responsible for this. In some countries this can also be the case. [pdf]
[FAQS about What is the warranty policy for European city battery cabinets ]
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