The Primo and Symo inverters come with a 10 year warranty as standard. By purchasing this, the warranty is extended by 10 years to give you 20 years warranty in total. The warranty extension covers cost of materials.
The warranty provides a 10 year warranty extension for the below inverter:
• Primo - 15.0-1
• Symo - 15.0-3 / 17.5-3