Now with Bluetooth built in! Ultra fast Maximum Power Point Tracking (MPPT) Especially in case of a clouded sky, when light intensity is changing continuously, an ultra fast 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. BatteryLife: intelligent battery management when a solar charge controller is not able to recharge the battery to its full capacity within one day, the result is often that the battery will continually be cycled between a “partially charged” state and the “end of discharge” state. This mode of operation (no regular full recharge) will destroy a lead acid battery within weeks or months. The BatteryLife algorithm will monitor the state of charge of the battery and day by day slightly increase the load disconnect level until absorption voltage is reached. From that point onwards the load disconnect level will be modulated so that absorption voltage is reached about once every week. PLEASE SUPPLY TELEPHONE NUMBER WHEN ORDERING!