Here in the hills of Pennsyltucky, we lose electric a lot.
In a couple instances, when the electric's been out for 8 or 10 hours, I started the generator and ran a heavy extension cord from the PC's outside receptacle to the Refrigerator, Freezer, a few lights and the microwave. I did this on 4 hour cycles alternating our points of usage.
I Looked for but did not detect any alarming heat at the internal wiring, plug, cord or sockets.
It's a bit Rube Goldberg but we didn't lose any frozen item and had hot food in an outage of over 26 hours.