The probability of failure is only when you go overcapacity, and in that case, a quality inverter trips the system. You will have to switch off the ingoing and outgoing supplies, then switch of extra load, and your inverter is ready to use. In case, if this doesn’t work, then contact the company that installed your solar panel system. Like any other electric appliance, if the solar inverter is used under its capacity, it won't fail. They have longer lived and warranties.