Caveat: This reply concentrates on the computer hardware, not other units that might also be powered via the UPS. I've seen occasional experiences of non-sine wave power becoming incompatible with specific other equipment. Unstable power might not subject much when handling an incandescent gentle bulb or a space heater. But https://bangkokwax27048.mybuzzblog.com/13513051/ups-uninterruptible-power-supply-can-be-fun-for-anyone