1. Easy maintenance.2. Light weight and high efficiency3. Easy to install and easy to install.4. Wide range of applications (outdoor, mountain, grassland and other power generation, charging, portable emergency charging)Solar Panel:Name: 30W Solar PanelTolerance: +-5%SLA Battery Voltage: 12VType of Solar Cell: MonocrystallineOpen Circuit Voltage(Voc): 12VMaximum Ystem Voltage: 12VTemperate Coefficient of : (010+- 0.01 ) %CTemperate Coefficient of Voc: - (0.38 +-0.01 ) %CTemperate Coefficient of Power Voc: -0.47%CTemperature Range: -40 Celsius to +80 Celsius40A Controller:Rated Voltage: 12V24VRated Current: 40AMax.PV Voltage: 50VMax.PV Input Power: 650W(12v) 1300W( 240v)colour:BlackMaterial:Monocrystalline siliconsize:420 x 270 x 15mmPackage Contents:1 x Solar Panel with Battery Clip1 x 40A ControllerOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +- 1-3cm.