Generator advice is good. Honda 2000 for $1000, you won't regret it. Inverter generators are a great advancement over the noisy, gas swilling beasts of the past. That 2000 may not pull a 13.5 BTU A/C.

If you go the inverter route get one with a replacement plan, don't buy it at a truck stop, etc.

Read about sine wave inverters before you buy.