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Windows 7: UPS advice - stepped sine wave or pure?

24 Jun 2015   #11
tgfyhre

Windows 7 32bit Home Premium
 
 

Here's a review I found on the Cyberpower UPS I'm considering:

CyberPower CP1500PFCLCD - Enthusiast Power Protection: Four-Way 900 W UPS Roundup

Interestingly, this model line by Cyberpower doesn't actually output a pure sine wave, but rather an approximation using what it terms "adaptive sine wave":

"Besides being the smallest, lightest, and cheapest unit in today’s roundup, the CP1500PFCLCD is also the only unit that has not fully replaced step-wave with pure-sine-wave circuitry, instead opting for a modified triangular wave that CyberPower calls “Adaptive Sinewave” to eliminate the zero power state that has so often prevented step-wave units from working with active PFC power supplies. This basically means that users get the enhanced compatibility of a sine wave unit at a low price similar to many step wave competitors."

From what I've read it outputs a wave so close to pure that PFC power supplies accept it as pure.


My System SpecsSystem Spec
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24 Jun 2015   #12
Lady Fitzgerald

Win 7 Ultimate 64 bit
 
 

I wouldn't trust it myself for PFC PSU. Consider how much your computer cost
and how valuable your work on it is versus what you are willing to pay for a
UPS.

Keep in mind that a UPS is a long term investment. Batteries can last as long
as three years, sometimes more, and are usually replaceable for much less than
replacing the UPS.


Edit: The Tom's Hardware article is about two years old and may either be reviewing an earlier version of that UPS or they just might be full of it. I just looked that model number up on Amazon's, Newegg's, and CyberPower's websites and all three said that it is a pure sinewave unit that is 100% PFC compatible. If this is the unit you can afford, then it should be ok. I would still suggest getting it locally if possible since I saw some complaints on damage on arrival due to packing issues.
My System SpecsSystem Spec
24 Jun 2015   #13
tgfyhre

Windows 7 32bit Home Premium
 
 

The problem is there's no way I can afford an APC full true sine wave unit. It's just beyond my spending range. The Cyberpower seems to offer something that comes much closer to the pure sine wav output PFC power supplies require.

The question is - would this unit offer an improvement and a benefit over a standard Cyberpower or APC UPS with standard stepped sine wav output, or would there be no benefit? From reviews on this unit it seems there is a benefit over the cheaper alternatives like the one I own currently.

If money wasn't an object, of course I'd go with a true pure sine output, but this costs far less and it puts it in a range I can afford, with hopefully some gain over the standard units in this price range.
My System SpecsSystem Spec
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24 Jun 2015   #14
Lady Fitzgerald

Win 7 Ultimate 64 bit
 
 

See the edit in my previous post.
My System SpecsSystem Spec
24 Jun 2015   #15
tgfyhre

Windows 7 32bit Home Premium
 
 

That item on Amazon says the following under Product Description:

"Cyberpower PFC Adaptive Sinewave Intelligent LCD CP1500PFCLCD 1500VA UPS CP1500PFCLCD Uninterruptible Power Supplies (UPS)"

Adaptive Sinewave is what I described above - not pure sine wave, but simulated. Also, here's an answer in one of the first questions somebody asked about the adaptive sine wave technology on that amazon page:

"Senior Technical Support Specialist at CyberPower:
"No digitally created wave can be a true mathematically curved analog wave. But the number of digital steps used to create the wave can be great enough that the electronics used in even the highest efficiency computer power supplies are unable to distinguish them from an analog wave. The total harmonic distortion of the output on battery is under 2% which means the output of the UPS is closer to a mathematically ideal analog wave than the powercoming out most peoples walls.
"These units were created specifically for the needs of computer users with Active PFC power supplies. We put PFC in the model name to highlight the fact that these units are compatible with Active PFC Power Supplies."
My System SpecsSystem Spec
24 Jun 2015   #16
Lady Fitzgerald

Win 7 Ultimate 64 bit
 
 

The only description I found on Amazon was it was pure sine wave. In that same question, this is a response:

"Adaptive sine wave was an early marketing term that was used for this series of UPS system. Our marketing has since changed to reflect the true wave form output of this series of CyberPower UPS systems."

It could be you are reading an older description of the UPS instead of the current one.

It doesn't really matter how a sine wave is achieved as long as it results in an actual sine wave. If enough steps with little or no space between the steps are used to simulate the sine wave (which most stepped sine wave supplies do not have) and is then filtered to smooth out the tiny steps, the result will be essentially the same as the sine wave the power companies put out, possibly with less distortion. I still feel this UPS will be fine. If it wasn't able to handle PFC PSUs, it wouldn't get as high of a user review rating as it does.
My System SpecsSystem Spec
24 Jun 2015   #17
tgfyhre

Windows 7 32bit Home Premium
 
 

Thank you for digging deeper into this. Would you mind linking to the Amazon page with the item that carried that description? I want to make sure I purchase the right version of that unit.

Is this the item?

Amazon.com: CyberPower CP1500PFCLCD PFC Sinewave UPS 1500VA 900W PFC Compatible Mini-Tower: Electronics
My System SpecsSystem Spec
24 Jun 2015   #18
Lady Fitzgerald

Win 7 Ultimate 64 bit
 
 

That is the one. I also noticed this note: Item is hazmat and non-returnable. I suggest trying to buy it locally if possible to simplify returning it if it should arrive DOA (unlikely but still possible).
My System SpecsSystem Spec
24 Jun 2015   #19
tgfyhre

Windows 7 32bit Home Premium
 
 

Wow, I can't believe they wouldn't allow a return on this, even if it was dead. How is that even legal?

Nobody locally sells any of these. I checked Newegg and this item is covered under their standard return policy. I guess Amazon loses this one.
My System SpecsSystem Spec
24 Jun 2015   #20
Lady Fitzgerald

Win 7 Ultimate 64 bit
 
 

Quote   Quote: Originally Posted by tgfyhre View Post
Wow, I can't believe they wouldn't allow a return on this, even if it was dead. How is that even legal?

Nobody locally sells any of these. I checked Newegg and this item is covered under their standard return policy. I guess Amazon loses this one.
I'm guessing if you had to return it due to it being DOA, you would have to deal directly with CyberPower instead of Amazon

Any vendor can legally refuse to accept returns on anything as long as that is made clear up front. In this case, Amazon apparently doesn't want to deal with the legal hassles of dealing with hazmat returns that may become hazwaste. I used to deal with hazwaste when I was working for the utility I now get my pension from. You would not believe the huge number of complicated regulations and incredibly high penalties involved with hazwaste.

Although I don't blame Amazon for not wanting to deal with potential hazmat/hazwaste issues, I would do the same as you and go with Newegg.
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 UPS advice - stepped sine wave or pure?




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