No 240V mode on my generator. It will run the AC, I just can't have anything else running but the interior LED lights. If those devices cut the surge by that much, then that explains why they are so expensive- There's a lot more electronics and logic to the power delivery. I still don't feel they should cost THAT much though. A lot of stuff I am reading says those hard start capacitors are only good for ~5 amps or less. So if your marginal on the generator it will make it work better. Still may not give you the microwave, TV and all that at once, but I sure do like the price better.