Especially in case of a clouded sky, when light intensity is changing continuously, an ultra-fast Maximum Power Point Tracking (MPPT) controller will improve energy harvest by up to 30% compared to PWM charge controllers and by up to 10% compared to slower MPPT controllers. Cloud Energy 100 VOC, 30 Amp MPPT solar panel charge controller is suitable for 12V and 24V battery systems including Lithium. The MPPT 100/30 is a high efficiency solar controller with 12/24V battery system autodetect. The rotary switch on the unit can select 7 different charge settings including gel, AGM and Lithium. More advanced programming is available with the USB or Bluetooth interface.