... ,17% Efficiency, Poly Crystalline ,Silicon Frame,Tempered Glass. Gel Battery, Lifespan:5-8 years 38Ah/12V,Sealed Type,Gelled.Deep ... and discharging Protection, Reserve-connection Protection, Switch on Automatically with Light Sensor. Switch off after 11-12 hrs later Light ... than 20 years 3M Height,Steel Q235,Hot-Dip Galvanized. With Arm,Bracket,Flange,Fittings,cable,Etc Plastic Coated,Rust Proof ...