... test of 5400Pa mechanical loads.We have got TUV,UL,MCS,CE,ROHS and Golden Sun certificate for our products, ISO9001 ... assure reliable solar panels.-Passed 5400Pa mechanical loads testing by UL, can withstand bad and high mechanical load working environment.- ... performance of system and solar panel life span.-TUV,UL,MCS,CE,ROHS,Golden Sun certified-Underwriting of 25years output power warranty ...