I had a Ramsond 3500 inverter generator, and they swore up and down when buying it that it would have more than enough power to run my AC. It would do it.....barely. She worked her guts out to run anything bigger than a light bulb. Lol That generator was a huge disappointment. The inverter finally died (after the battery, starter gave up long before it), and instead of paying $300 for a new invertor to fix it, I paid $399 for a 3000-4000 Champion at Costco. Let me tell ya, this generator "is" a champion. Runs my AC without even breaking a sweat. And it will run my microwave at the same time. I don't know anything about step down this or 240/120 that. If she runs it, it'll work, if not, she'll trip and you'll know either way.