If the inverter's display doesn't show any lights or activity, the most common problem is that there is no DC voltage to the inverter. All of the Ginlong inverter's internal electronics are powered by the DC. If there is no DC voltage the inverter will not power on.
Check for DC voltage open air, then terminate the conductors and check DC voltage while landed at the inverter. If you have GOOD DC voltage within specifications for each inverter, you need an RMA.
If there is NO DC voltage present, inspect the array to determine why there is no DC power to the inverter.
Single Phase inverter's require a minimum of 90-120V to activate the internal electronics.