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Solar panels warranties, inverter warranties and performance guarantees do not vary much between manufacturers. Most of the top brands are manufacturing a solid and durable product.
Manufacturers warranties are subject to change and may vary slighty between different products. All manufacturers warranties will apply. The information below serves only as a guideline.
 Electric classifications, safety class II
Standard UL1703 / IEC 61215-2 for grid tied in the USA
Manufacturers warranties 3-5 years
Output guarantee 90% performance 10-12 years
Output guarantee 80% performance 20-25 years
One year labor on all grid tied integration projects
Applicable to both mono and poly crystalline modules
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Manufacturers product warranties 
