The SHS20 solar portable system ,is very lightweight, beautiful and practical . The SHS20 is ... ,battery, solar charge controller, power box and so on.System design:Item Equipment Specification unitsquantity1solar panel 20w /12vPCS 12Battery 17AH ... load with the 20watts system Item Equipment Specification unitsquantityWorking hours/per day 1Energy saving lamps11w/12vPCS 1 6 20w portable solar system