If you did nothing but wire in the new controller to the old wires, solar array, batteries, switches etc. than I would assume the controller may have a loose connection or you got one bad out of the box.
I would test the voltage coming into the box from the solar, good? then I would pull out each wire, re-insert and tighten. Still nothing? call the MFG.
This assumes that all the fuses are good, switches did not fail or accidentally loosened wires in the process.
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2017 SLX 195RB
2021 Jeep Grand Cherokee Summit L 5.7L V8
Andersen WDH hitch, Renogy 100 AH Lithium &
200 Watts solar panels from Renogy
Prev. '14 Jeep Grand Cherokee Overland, gas 3.6 V6
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