I’ve got a similar Cyberpower 1500, it’s simulated sine wave. It’s perfect for my desktop, network gear, and NAS. Pure sine wave seems like it would obviously be better, idk how exactly, but none of my hardware seems to care about simulated sine wave. The 1500 gives me enough time to shut down the desktop and it’ll run the NAS and network gear for a few hours. If I’m full power gaming (5800X3D, 3090, big ultrawide OLED) and the power goes out, I get about 15 minutes. Batteries lasted 3 years before they needed to be replaced, that could have been due to high ambient temperatures.