Feature: 1. Easy maintenance. 2. Light weight and high efficiency 3. Easy to install and easy to install. 4. Wide range of applications (outdoor, mountain, grassland and other power generation, charging, portable emergency charging) Specification: Solar panel: Name: 30W solar panel. Size: 335x205x16mm Tolerance: +/-5% SLA battery voltage: 12V Solar cell type: Monocrystalline Open circuit voltage (voc): 12V Maximum system voltage: 12V Temperate coefficient of Isc: (010+/- 0.01 )%/C Temperate coefficient of Voc: - (0.38 +/-0.01 )%/C Temperature coefficient of power Voc: -0.47%/C Temperature range: -40℃ to +80℃