... 3. apply to shortage of power 40w portable solar power system:SpecificationSolar panel20Wp *2PCSBatterycapacity12V17Ah * 2 PCSIntelligent controller5A ... region and season with differences. 1.Make up of solar panels, free maintenance lead acid battery, controller, invertor, bracket, ... .We also have solar panel, PV modules, solar system, and solar water pump, 15W OR 30W solar portable home system. ...