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05-19-2020, 07:44 AM
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#1 |
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Quiet observer
Join Date: May 2010
City & State: Central Florida
My Country: USA
I'm a: Hobbyist Tech
Posts: 55
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Silent APC UPS?
My old BackUPS LS 500 is silent. When it is not running on battery, there is no hum or slight buzz at all -- nothing. I like that.
I just got a BackUPS CS 350, hoping it would be silent too, but it has a slight hum/buzz to it. When the room is very quite, you can hear it from 10 feet away. Does anyone know of a good brand of UPS that is silent, and around 300-500VA? |
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05-20-2020, 07:02 AM
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#2 |
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Quiet observer
Join Date: May 2010
City & State: Central Florida
My Country: USA
I'm a: Hobbyist Tech
Posts: 55
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Re: Silent APC UPS?
Just a quick update... My LS 500 actually does make the faintest hum, but you can only hear it when you ear is right up next to it.
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05-20-2020, 07:38 AM
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#3 |
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Solder Sloth
Join Date: Nov 2012
City & State: CO
My Country: USA
Line Voltage: 120VAC 60Hz
I'm a: Hobbyist Tech
Posts: 4,862
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Re: Silent APC UPS?
and I thought I was being over sensitive when I can't stand Delta fans...
/me goes back to listening to the computer fan cacophony. Sans Delta fans however. |
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05-20-2020, 08:31 AM
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#4 |
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Leaking Member
Join Date: Dec 2014
City & State: Atlantic Canada
My Country: Canada
Line Voltage: Ground, 0Hz
I'm a: Hobbyist Tech
Posts: 4,497
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Re: Silent APC UPS?
my smt-750 is totally silent.
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05-21-2020, 05:32 AM
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#5 |
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Quiet observer
Join Date: May 2010
City & State: Central Florida
My Country: USA
I'm a: Hobbyist Tech
Posts: 55
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Re: Silent APC UPS?
Thanks for the feedback on the 750.
I have found out that my cs-350 is much quieter when sitting on carpet vs. tile. And that makes a lot of sense because carpet absorbs a ton of sound, yet it still surprised me how much difference it made. I can live with it now. |
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05-21-2020, 03:32 PM
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#6 |
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Badcaps Veteran
Join Date: Jul 2011
City & State: Sunny Jacksonville FL
My Country: USA
Line Voltage: 120 Volts 60 HZ
I'm a: Knowledge Seeker
Posts: 2,020
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Re: Silent APC UPS?
Dose it have vents on the of this UPS supply
__________________
9 PC LCD Monitor 6 LCD Flat Screen TV 30 Desk Top Switching Power Supply 10 Battery Charger Switching Power Supply for Power Tool 6 18v Lithium Battery Power Boards for Tool Battery Packs 1 XBox 360 Switching Power Supply and M Board 25 Servo Drives 220/460 3 Phase 6 De-soldering Station Switching Power Supply 1 Power Supply 1 Dell Mother Board 15 Computer Power Supply 1 HP Printer Supply & Control Board * lighting finished it * These two repairs where found with a ESR meter...> Temp at 50*F then at 90*F the ESR reading more than 10% 1 Over Head Crane Current Sensing Board ( VFD Failure Five Years Later ) 2 Hem Saw Computer Stack Board All of these had  CAPs POOFAll of the mosfet that are taken out by bad caps
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05-24-2020, 07:48 AM
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#7 | |
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Quiet observer
Join Date: May 2010
City & State: Central Florida
My Country: USA
I'm a: Hobbyist Tech
Posts: 55
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Re: Silent APC UPS?
Quote:
I think the sound mostly comes out of the top vents. Also, when I squeeze the side of the UPS (which is plastic), the sound changes a bit, and is a bit quieter. |
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05-25-2020, 11:06 AM
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#8 |
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Badcaps Veteran
Join Date: Jul 2011
City & State: Sunny Jacksonville FL
My Country: USA
Line Voltage: 120 Volts 60 HZ
I'm a: Knowledge Seeker
Posts: 2,020
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Re: Silent APC UPS?
Them cheap plastic cases again
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