In conclusion, the warranty period for solar panels brackets kits can range from 5 to 25 years, depending on the material, manufacturing process, environmental factors, and installation quality. Inverter, the only electronic part of the whole system, can convert the DC current into AC current. Common Terms: Manufacturer warranties often cover defects in materials and workmanship, ensuring that the solar panels and inverters meet specific quality standards. How Much Does a Solar Panel and a power performance guarantee of 92% after 25 years. It depends on several factors, and I'll walk you through them one by one. For instance, aluminum brackets are quite popular.