I have a Lenovo Thinkpad 3, and while it charged on my everstart inverter for 6 months, it stopped and I can't figure out why. It's a pure sine wave inverter, rated for 100v (max 110), and the AC adapter for the laptop is 65w. I did go buy a brand new inverter, but no luck. And as the others say, it charges fine at home using said AC adapter, and the inverter is capable of charging everything from phones and tablets to power drill batteries, portable refrigerators, and small televisions. I have checked with a multimeter, and the adapter is indeed supplying 19.5 watts at the output plug.