2 UPS in series (pure and simulated sine wave)

Borka

Borka

Borka

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13 Mar 2020
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Hi all,
I currently have an APC ES 700 UPS, which has a simulated sine wave output. Cause of that, I'd like to buy a pure sine wave UPS: https://www.cyberpower.com/uk/en/product/sku/cp900epfclcd-uk
Question is, if I can hook up the APC (simulated) into the Cyberpower (pure). I am not worried about the backup power length or/and inefficiency. I just need the extra socket outlets for peripherals.
My idea is:
Mains -> PureSineWave (PC and monitor) -> ModifiedSineWave (peripherals).
Would that be all right in terms of safety/damaging the devices?
Cheers.
 
That's what I was thinking about. I now it's not the best idea to do that, but I thought since the 1st UPS (from mains) outputs a pure sine wave, it shouldn't be a problem for the 2nd one.
 
No sense to waste output of one UPS for feeding worser one.
Just get extension cord and connect UPSes to that.
Or surge protector and connect peripherals not needing battery backup directly to it.
 
You cannot link 2 ups's together as they will not work joined up together. I always plug my ups into a decent quality surge protector to save the surge protector wearing out in the UPS
 
The reason that you cant join 2 UPS's together is because when a UPS is on battery mode it produces quite dirty power. So sending power from the 1st UPS(thats on battery mode) to the 2nd ups, the 2nd UPS will also be using battery mode because the power from the 1st UPS wont be clean enough to stop the 2nd UPS going to battery mode..... So thats the reason and it doesn't matter the a UPS produces dirty power while on battery mode because it spends 99% of the time on mains power.
 
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ketma said:
Is the simulated output from your UPS not doing the job ?
Click to expand...

yah, I wouldnt change the UPS just for that reason, only change if you need more power or your current UPS is quite old.. Like I said in my last post, the UPS is on mains power most of the time so you electronics wont mind simulated wave output once in a blue moon for a few mins here and there.

My last UPS I had used simulated wave output aswel (1200va/650watt), I kept that for about 10yrs and has seen off 3-4 systems over the years. I have a nice online 2000va/1800watt UPS now thats powering near enough everything in my bedroom/mancave, retiring the old 1200va/650watt UPS to the sitting room where its powering a tv and sky, as the sky box takes ages to boot up after a powercut.

Edit: just use a 4 way strip thingy if you need more sockets, I dont think it really matters how much you have plugged in to a UPS, just dont go over the max wattage limit that the UPS can produce..... I have 10 -15 things plugged into mine but its only using a max wattage output of about 400watts
 
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