[RFI] UPS recommendations -which Tripp Lite models

[donovanf at erols.com]

Many of us use UPSs primarily to back up our computers, 
but the UPS function isn't very important any more. Its still wise 
to have surge suppression in your home 



Developments in recent years that have made UPSs less important: 
- very robust windows 10 power failure recovery 
- no more electro-mechanical disks 
- widespread use of laptop computers 


I've had an unrecoverable Windows 10 power failure in well over 
five years. 


73 
Frank 
W3LPL 


----- Original Message -----

From: "Jim Brown" <jim at audiosystemsgroup.com> 
To: rfi at contesting.com 
Sent: Tuesday, August 24, 2021 9:11:14 AM 
Subject: Re: [RFI] UPS recommendations -which Tripp Lite models 

On 8/23/2021 9:04 PM, Hugo Loranger wrote: 
> I had 3 Cyberpower CP1500PFCLCD and in operation I hear a lot of noise. 
> When they are on standby, they are silent but when the current cuts off the noise increases drastically. 
> I have a switch where the 2 UPS are connected and when it is off it is obvious that the noise comes from the 2 ups ... 

Hi Hugo, 

I have not evaluated them when the power is down and they are supplying 
power to their loads. I have serious common mode chokes on their power 
cables, as I do with all potential noise sources. 

73, Jim K9YC 

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