I run my internet gear off a separate CyberPower pure sine UPS, just the ONT, router, and a small switch.
At first I had a small issue where the UPS transfer to battery had a tiny delay and my ONT would reboot, which meant internet dropped for a few minutes every time the power flickered.
Turned out the ONT power brick was just really sensitive to that split second switchover. I fixed it by putting the ONT on a small DC mini UPS instead, while leaving the router and switch on the main UPS. Since then the internet stays up even during short outages and voltage dips.
For a main gaming PC though, I’d still definitely go 1500VA pure sine like everyone is recommending here.
At first I had a small issue where the UPS transfer to battery had a tiny delay and my ONT would reboot, which meant internet dropped for a few minutes every time the power flickered.
Turned out the ONT power brick was just really sensitive to that split second switchover. I fixed it by putting the ONT on a small DC mini UPS instead, while leaving the router and switch on the main UPS. Since then the internet stays up even during short outages and voltage dips.
For a main gaming PC though, I’d still definitely go 1500VA pure sine like everyone is recommending here.