What's the actual problem, Nobby??
Does the gas jet light OK, but the fridge still doesn't work, or can't you get it to light?
If the former, and it works OK on electric, it's probably the thermocouple.  If the latter, don't forget you have to hold the gas button down when you light it, and hold it down for 10-15 seconds after you light it to warm up the flame-failure device.
If it works OK on electricity, there's no point in inverting it (sorry Anita) - the refrigeration plant is the same for all 3 modes - only the heat source changes.
If all else fails, you'll have to pitch near me and borrow some amps from the genny. 
Del