... up to 5 years Controlled charging to protect battery service life Long-life solar panel with more than 25 years of power ... split night, full power, diming. Gel type sealed battery, long life with charging & discharging. No need maintenance. Durable pole made by ... Q235 steel, hot-galvanizing & powder spray treatment.Over 20 years life, resistance of sunny, rainy, windy and salty weather. System Diagram ...