Victron Blue Solar PWM Charge Controller with LCD and USB 12/14 30A The BlueSolar Charge Controller uses Pulse Width Modulation (PWM) charge voltage control with a programable charge control algorithm. This BlueSolar controller is a simple and cost effective way to add a solar panel to your current system. Although it does not have the same features as the SmartSolar range it will provide the connectivity and control required to create a solar power/battery storage system. Features  Liquid Crystal Display Two 5 Volt USB outputs Lighting control function, fully programmable   Three stage battery charging (bulk, absorption, float), fully programmable Load output with low voltage and manual disconnect (programmable) Load output protected against over load and short circuit Protected against reverse polarity connection of the solar panels and/or battery Prevent Battery Over-Discharge Load output over-discharge of the battery can be prevented by connecting all loads to the load output. The load output will disconnect the load when the battery has been discharged to a pre-set voltage. Some loads (especially inverters) can best be connected directly to the battery, and the inverter remote control connected to the load output. A special interface cable may be needed, please see the manual. The connect and disconnect voltages are adjustable.