The VE.Direct TX digital output cable must be used in combination with the BlueSolar MPPT 75/15 or the MPPT 100/15. Energy consumption can be significantly reduced by the ability to dim lighting when needed. Lower power consumption will reduce the overall system cost. Also, the availability of the lighting will increase, even in case of a partially charged battery in low sun. This cable is designed for lighting applications in solar energy systems. (more applications will follow later). The cable connects the TX output of the VE.Direct connector of an MPPT 75/15 or 100/15 with the PWM dimmer input of the LED driver. T he MPPT charge controller must have a software version 1:15 or higher. A MPPT charge controller with an older software version can be updated for this.