anyone can explain what and why is this sound "ezz ez ez zzz" clearly starting from 0:34, the ups is niky 1000, i am using 7s6p good lithium 18650 cells pack, that sound only appear when i load any pc or lcd or crt, but never ever when using even much higher load 200w tungsten bulbs, althogh the sound, it never shut down nor give a warning and the pc or lcd or crt works completely normal at all times, in the video u can notice that the bx100 (voltmeter) is restarting with the sound, also the bulb flickers with the sound, i have checked only the largest cap on board (which is not that big) and it was 50v 1000uF and i found it ok, i am really curious to know the reason of that sound, if the battery is full it does not make the sound unless the INDUCTIVE load is too high, weak battery with high but resistive load (bulbs) no sound at all!!
at the end of the video i added a bulb along with the pc and lcd, u can see how the bulb flickers with the sound, when i turned off the pc and lcd the sound is gone and the bulb is not flickering also. what could it be, it is not of a high load at all because no matter how high load but only bulbs it is fine, the pc and lcd used are both no more than 80watts max together, the bulb is 100w, and i used 2 of them with no issues at all for a very long time.
at the end of the video i added a bulb along with the pc and lcd, u can see how the bulb flickers with the sound, when i turned off the pc and lcd the sound is gone and the bulb is not flickering also. what could it be, it is not of a high load at all because no matter how high load but only bulbs it is fine, the pc and lcd used are both no more than 80watts max together, the bulb is 100w, and i used 2 of them with no issues at all for a very long time.
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