Niky 1000 UPS making strange sparking noises (video)

[stj]

most invertors wont charge a bettery with no charge, so using a load wont work,
they also dont stop charging - they switch to tricklecharging al low current.

back to the problems,
transformers hum because they can move - tightening any bolts and maybe putting wax or epoxy on the windings can reduce it.
ticking or clicking could be a loosly wound inductor.

[petehall347]

fizzing sound sounds like something that is damp or wet arcing . . not saying that's what it is but sounds just same

[CapLeaker]

If there is arcing, you would think it should show on the PFC.

[GraphicMan]

most invertors wont charge a bettery with no charge, so using a load wont work,
they also dont stop charging - they switch to tricklecharging al low current.

back to the problems,
transformers hum because they can move - tightening any bolts and maybe putting wax or epoxy on the windings can reduce it.
ticking or clicking could be a loosly wound inductor.

it does a float charging and lithium cant take more voltage by giving more current, nothing goes to it, so it never go beyond 27.3
we dont want to go into that coz it is totally another topic
i dont have anything that is loose, notice how the sound stops immediately after turning off the pc and lcd while still on bulb

[GraphicMan]

the problem is fixed by replacing a capacitor that was reading less than what it should, thanks for everyone tried to help