Renogy 60 Amp Commander MPPT Solar Charge Controller Advanced maximum power point tracking technology with high tracking efficiency as high as 99.7%. Multiphase synchronous rectification technology ensuring peak conversion efficiency up to 98.7%. Optimizes charging current smoothness, reduces ripples, and improves the system generating efficiency. Electronic protection against overcharging, over-discharging, overload, and short circuit. The cast aluminum radiator shell permits excellent heat dissipation, allowing natural cooling.