I did this a few weeks ago when power was out for the better part of 6 hours. I had a 2000W inverter with a 5-15R, so I made a 5-15P to a L14-30R to plug in to my 14-30P inlet. But, I did kill all of the 240V appliances, like the AC compressor, oven, and dryer. Not sure if those would cause...