The maximum voltage input for a standard Wattsun Tracker Controller is 50 VDC. PV arrays and battery banks that have a "working" voltage greater than 24 VDC nominal can exceed the 50 VDC threshold. The 48-24 LVC regulator limits the voltage input to the tracker controller to a maximum of 35 VDC. At 37 VDC and below, the actual operating voltage is 2 VDC lower than the input voltage. At input voltages of 37 VDC to 66 VDC, the output voltage from your solar energy system will be regulated at 35 VDC.