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CyberPower CP550SLG Standby UPS 550VA 330W Compact

4.1 out of 5 stars 733 customer reviews
| 82 answered questions

Price: $51.95 & FREE Shipping. Details
In Stock.
Ships from and sold by Amazon.com. Gift-wrap available.
550VA Size Chart
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  • 550VA/340 Watts UPS system - Protects PCs, peripherals and personal electronics. Prevents data loss and interruptions that can cause lost product configurations.
  • GreenPower UPS - reduces energy consumption up to 75% compared to competitive models.
  • Output Connections: (4) Battery Backup & Surge Protected Outlets, (4) Surge Protected Outlets
  • RJ11 - DSL / Phone Surge Protection - USB Management Port
  • Power Panel Personal Edition Software Included - Compact Desktop Form Factor - 3 Year Warranty
85 new from $48.65 2 used from $50.49

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Warranty information: three year warranty for units and batteries

easychoice home laptop
$51.95 & FREE Shipping. Details In Stock. Ships from and sold by Amazon.com. Gift-wrap available.

Frequently Bought Together

  • CyberPower CP550SLG Standby UPS 550VA 330W Compact
  • +
  • CyberPower CP1500AVRLCD Intelligent LCD UPS 1500VA 900W AVR Mini-Tower
Total price: $191.90
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Technical Details

Size: 550VA
  • Brand Name: CyberPower
  • Model Number: CP550SLG
  • Item Height: 6 inches
  • Item Length: 3 inches
  • Item Width: 9.75 inches
See more technical details

Product Description

Size: 550VA

CyberPower Standby CP550SLG 550 VA Desktop UPS safeguards home/office computers and other electronics (monitors, scanners, speakers, CD/DVD players, MP3 players and phones) from surges, spikes, sags, brownouts and other power abnormalities. Its composite integrated circuitry offers advanced lightning protection.

Product Information

Size:550VA
Product Dimensions 3 x 9.8 x 6 inches
Item Weight 6.4 pounds
Shipping Weight 6.8 pounds (View shipping rates and policies)
ASIN B002QAUN2M
Item model number CP550SLG
Customer Reviews
4.1 out of 5 stars 733 customer reviews

4.1 out of 5 stars
Best Sellers Rank #16 in Electronics > Accessories & Supplies > Computer Accessories > Uninterruptible Power Supply (UPS)
#74 in Electronics > Accessories & Supplies > Power Protection
Date first available at Amazon.com April 2, 2004

Technical Specification

Warranty [pdf ]

Warranty & Support

Product Warranty: For warranty information about this product, please click here [PDF ]

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From the Manufacturer

CP550SLG Battery Backup UPS EC850LCD Battery Backup UPS CP825AVRLCD Battery Backup UPS CP685AVR Battery Backup UPS
CP550SLG EC850LCD CP825AVRLCD CP685AVR
Battery backup with surge protection
Automatic Voltage Regulation (AVR) - Line-Interactive Topology
ECO outlets - automatic on/off
Free automatic shutdown software with USB connectivity
Multifunction LCD
Network DSL phone (RJ11/RJ45) surge protection
Coaxial (RG6) surge protection

Customer Questions & Answers

Customer Reviews

Top Customer Reviews

Size: 425VA
I had a power outage during a lightening storm. When the power came back the PC that was connected to the (3 month old) Cyberpower UPS/Surge Protector stopped working. I applied for a refund for the cost of the PC, under their equipment warranty. They made me fill tons of paperwork, made me spend 40 bucks on a diagnosis from Geek Squad(who confirmed that my motherboard was fried). After all that hassle, and mailing them the old UPS back, they claimed that their UPS had functioned fine, and refused to pay me anything. The way the refund process is setup, they can pretty deny anyone a refund. Not only does their equipment not handle a lightening surge, their equipment warranty is not worth anything.
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Size: 425VA Verified Purchase
I've used Cyberpower UPS for years as I live in a suburban area subject to frequent blackouts lasting from several seconds to several days. I use Cyberpower UPS to keep my TiVo functional, keep my FIOS modem / wireless router running, and keep my iMac bittorrent server running. I've never been disappointed in Cyberpower's products and the single time I needed warranty service it was rapid and complete.

My brother has multiple handicaps and uses his laptop as his primary entertainment point. Recently his area (not far from my home) has begun suffering blackouts of several minutes to several hours duration. He asked me to select an UPS to keep his DSL modem / wireless router running. Of course I turned to Amazon and selected this model from Cyberpower.

The Westell's wall wart consumes around 7 watts. When this arrived, I charged it for 8 hours then pulled the plug with a 15 watt CFL lamp on the backup outlet. An hour later the lamp was still lit and the UPS wasn't indicating pending shutdown.

As to the green claim, it stands up. I am a 56 year old tech geek and purchased the P3 International P4400 Kill A Watt Electricity Usage Monitor from Amazon back when it was introduced. I used it to measure the watts drawn while charging then in battery maintenance. This unit does consume far less power maintaining the battery as compared to the standard CPS425SL.

Some of my Cyberpower UPS are more than 7 years old and only now are needing their batteries replaced. Battery replacement is simply removing 6 or more screws from the bottom of the UPS models I own, opening it up, unplugging the old battery, then reversing the process to install the new battery.
Read more ›
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Size: 425VA
Unit works as advertised but unlike me, pay attention to the 255 watt maximum. I glossed over that important point to my regret; I've ordered another unit with 500 watt capacity. My system quickly overloaded the 255 watts and it turned off. I have a system with quad core, multiple LCD monitors, external hard drives, etc. This unit is for basic systems with one monitor.
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The manufacturer commented on the review below
Size: 550VA
Does not provide enough time to even turn off your PC. Battery is not user replaceable. Battery does not have enough amp-hours to properly run anything more than a mac mini. Advertised on the box -- "43 minutes" is clearly ficticious -- as the system it replaced had a battery 55% larger, which also said the same 43 minutes for a mac mini. CyberPower web site admits "2 minutes" at full load. This is deceptive -- people buying a 550VA UPS expect that it will last at least a few minutes...

I have installed a LOT of CyberPower UPS's over the last three years... I moved from (Brand) and (Brand) to CyberPower in 2006. Only one failed system in all that time. Outstanding. Now, I tried to buy the CP550SL ... but it is replaced with this one... I bought 4 of them only to find that at 2 minutes of power, I've wasted my money. The old model weighed in at over 12 lbs... 5.6lbs of battery. Now, the new unit is 6.3 lbs total. I am currently researching to figure out what new UPS brand to use for SMB servers and workstations.

If they had created a new model number that was different enough from the old one, I wouldn't have just bought them without the detailed review I normally do...

I am pleased that the manufacturer has responded confirming the 2 minutes of run time.

Recommendation: Only buy UPS's with user-replaceable batteries (not this one), because the electronics should be good for two or three batteries of life-time. Make sure you have enough time to think and turn off... which to me means at least 8 minutes of runtime (not this one).
7 Comments 98 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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The manufacturer commented on this review(What's this?)
February 29, 2012
RSC, We are truly sorry that you are disappointed with our new CP550SLG UPS system. You are correct, the new model is a more efficient UPS system design that uses a smaller battery than the older model. The run-times for the new CP550SLG are 2 minutes @ full load (330 watts) and 8 minutes @ half load (165 watts). These run-times are only slightly less than the older model at 3 minutes and 13 minutes respectively.
Size: 425VA
After reading a few too many "positive" reviews on this product, I thought I would add my two cents as a electrical engineer whom designs and builds super computer facilities.

While I could say more, the KEY factor that is over-shadowed by the CHEAP price associated with this product is the fact that its "simulated sine wave" is actually a square wave. Square waves pound your PC power supplies with an extraordinarily poor quality of power. In addition, given this unit's output Power Factor, less than 0.53 (where PF = Watts/VA), it is as priced, IMO, a piece of junk. Yet, given its price and bogus CEG Warranty, many consumers are attracted to purchase a product that lulls them into a false sense of security while this unit (in UPS mode) destroys your PC's power supplies - and in the event of a CEG Warranty claim, because the unit will "no doubt" test fine, the consumer LOSES the claim when it was this UPS that caused the failure.

In my professional opinion, ALL COMPANIES that promote CEG Warranties (or similar) should be required to offer a 35% discount to any consumer who elects to REJECT said CEG Warranty from the date of purchase. In the absence of an alternative solution, I find no remedy for every consumer who has ever been worked over by companies like CyberPower after filing a CEG Warranty (or equivalent) claim.

Sadly, similar warranties are often promoted by UPS companies that I have specified and installed on my projects. I have seen 225 KVA UPS systems (a few orders of magnitude larger than this unit) offer $10MM (million) warranties that have never found their equipment to be the fault of the problem.

T4USD
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