Don't feel too bad. I get several calls a day on this and most of them are electricians! They get hired to wire a power outlet a somebody's house/lot, etc or they did it for a friend. It does look like 240V to a trained electrician, but its not. The converter/Univolt NEVER survives. It is the first component to get hit. Beyond the Univolt/converter it becomes a game of luck. AC and Microwave are very vulnerable but not always damaged. Fridge, TVs and anything on the circuits are fair game but sometimes survive. An RV surge protector is pretty cheap insurance.
Converters, Inverters, Monitors, EMS, Zamp Solar