RioRand (TM) MPPT 20A Solar Charge Controller 12V/24V/36V/48V Network Regulator New RioRand MPPT technology; Excellent thermal design and nature air cooling; CE certificate; 12/24/36/48V auto work,Advanced MPPT technology,Several seconds tracking speed High Tracking efficiency of 99%,Multiphase synchronous rectification technology Peak conversion efficiency of 98% 7) DSP&ARM processors architecture ensures high speed and performance Three stages charging optimizes battery performance