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UPS not holding the load

D

davidcarey

n00b
Joined
Dec 17, 2017
Messages
31
I have a 2 month old UPS - DCP brand 1.2kva , 720w that is not holding the load ( 15 times ) . A single computer , X58 M/B , X5650 processor , 3 internal HDDs , 1 usb and the monitor which pulls 14w . A 1.2 should be sufficient , yes ? Corsair CX650m ( new ) PSU .
 
well 1.2 kilo can only do 750W.. 720W goes almost.. basicly to the end... and some i guess? never heard brand like DCP can have less than advertised anyways.. So.. i would throw monitor into other than battery backuped slot.. if there is any.. and how long can it handle the load? 2 mins? more? less? crashes instantly?
 
Usually if the UPS crashes without the utility power it’s a bad battery. If it’s crashing even with the utility then it’s a bad unit.

It appears you have more than enough capacity there. That setup pulls 14W idle, it’s probably closer to 350W if you were to put it under full load. Even with a monitor you should be fine. Make sure there isn’t a laser printer or something like that attached - those really pull when they come out of sleep.

I’ve also never heard of DCP - no idea if they are even worth a damn or if it will perform to its rating.
 
Sorry for the delay in replying , internet is really pathetic . The UPS make clicking noise ( which s very annoying ) very often , though there does not seem to be any mains power fluctuation . This morning I had a shutdown , the UPS did not hold the load . Running the computer without the UPS ( for days ) , suggests that the computer is stable and the power supply is constant - no power drops - a power drop without a UPS would shut down the computer , Is this correct ? Now just this minute I have had a clicking sound which drags on until I switch off the power to the UPS ( computer still remains on ) . Can anyone advise what is at fault , I need some ammunition to throw at the vendor .
 
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Clicking noise could be the AVR (auto-transformer) which is governed by relays. If this is the case then the mains could not be that stable after all and the computer PSU would have sustained them with no problem if it is quality one. Sometimes a computer with cheap UPS is more unstable than without. It could be your case. Throw in the fact if the UPS is a stepped sinewave one, coupled with your PSU might be a bad combination.
The unit price could be the leading factor to judge whether this unit is a cheap one or not.
A digital multimeter (volt-meter) could support or reject the theory of AVR kicking in when you hear those clicking sounds, well, sort of.
 
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Yup. the clicking is the unit picking up because of low voltage.

That ~could~ be a bad UPS unit.

It ~could~ also be bad power from your wall. Just because your computer runs on it doesn't make it good power. Multimeter might pick it up, but not always.

That being said - the unit shouldn't be clicking rapidly. If it's not holding load and it's clicking, that pretty well points to bad unit. Especially since it's old enough for the battery to have worn out.
 
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