I have 50 of these PWM installed for street light applications.
when the sun drops and PV voltage drops the PWM set on “L” activates the load output, this is connected to a 150w pure sine wave inverter. A 50w 220v AC LED is running off the inverter.
On several the load switches off flashing fast indicating short circuit.
But it is intermittent.
If it does trigger short circuit, it won’t recover that night, it may work correctly next day, but may fault again days later.