For PV modules there are two types of warranties:A product warranty, which covers defects on the solar panels. For that, the industry standard is 5-10 years, with selected manufactures offering up to 20 years.A power output warranty, which covers cases where the power output falls below the guaranteed levels. For that, industry standard is 20-25 years, with selected glass-glass module manufacturers even providing 30 years. [pdf]
[FAQS about Photovoltaic inverter warranty terms]
Standard warranties for lithium-ion batteries covering both performance and defects are two years, but extended warranties can be purchased. A warranty beyond 10 years does not make sense because so much of the battery would need to be replaced after year 10. Insurance can also be purchased. [pdf]
[FAQS about What are the warranty requirements for portable energy storage]
Most solar inverters come with either a full 10-year warranty or a 5-year full warranty plus a 5-year parts warranty. Fronius, Sungrow and SMA have ranked on top of the list for many years due to their low failure rates and great service, as they usually ship replacement units in 3-5 business days. [pdf]
[FAQS about Photovoltaic inverter with ten-year warranty]
Solar inverters are usually warrantied for a period ranging from 5 to 15 years, with an average standard warranty period of 10 years. Some companies offer the possibility to extend this period to up to 20 years. [pdf]
[FAQS about How long is the warranty period for home inverters ]
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