Grape Solar GS-50-KIT Off-Grid Solar Panel Kit, 50W Polycrystalline panel with anodized aluminum frames and tempered glass for outdoor use and superior performance An easy to read LED display on the charge controller shows charging current, discharge current and battery bank capacity Dual USB ports on the charge controller for directly charging portable devices Can expand up to 3 total 50-Watt panels in parallel using Grape Solar 50-Watt panels with branch connectors. Battery not included, a minimum of one 12-Volt deep cycle battery is necessary using this kit