... Life span, no rusting within 30 years.Solar panel: A, Solar panel, amorphous silicone,mono-crystalline silicone,poly- ... electricity leakage & water seepage when the battery is buried underground.B, Life span ≥5year , Gel battery: ≥8 yearsController ... aging waterproof connectorsB, Life span: ≥10yearsProduction field Solar street lamp project case Solar street light Wiring diagram DC12V system