Running fridge on generator

I have been playing the fridge game for a month on the road and cannot keep it cold in the real hot weather.I keeps blowing the thermal coupler diode and then I get a E-3 error. On our last week of the trip when the thermal coupler blew I jumped it and still will not keep fridge cold, night time fridge goes down to 34 or so degrees but in the day if it is real hot above 90 (and then blow the coupler) it will climb as high as 55, we travel alot and sometimes go for 10 or more hours freezing ice blocks does keep the food cold but the temp on fridge still goes up been thinking about hooking my generator up and trying that does anyone have experience with this method and does it keep the fridge cold off the electric. This has been a problem since I bought this TC, temp always rise after about 4 hours of travel time right from day 1 very frustrating.

Dave