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OPTI-UPS Enhanced ES550C Line Interactive AVR UPS 550VA 330W Simulated Sine Wave 6 Outlet USB

OPTI-UPS Enhanced ES550C Line Interactive AVR UPS 550VA 330W Simulated Sine Wave 6 Outlet USB - 1
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Reg. Price: $69.99  CAD
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Part #: ES550C

SKU: 16869
Shipping Weight: 20 lbs

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Customer Reviews of OPTI-UPS ES550C

Product reviews on NCIX.com are screened for relevance and inappropriate content. Reviews may contain inaccurate information about the product. If there is a discrepancy, please use the Flag this Review link located beside each review. Reviews are not an endorsement expressed by NCIX.com, but opinions from customers based on their own experience with a product. We do not recommend you make purchasing decisions based on facts or opinions expressed regarding OPTI-UPS ES550C reviews.
J c
Experience: 4 Months


Powerful and Stable.
Voltage fluctuations in my area are quite frequent and there are occassions when the power goes out for a few seconds. The OPTI-UPS ES550C has already saved me a lot of precious work since I purchased it 4 months ago. Very functional product!

Experience: 10 Months


works perfectly with NT and XP
not work too good with Linux
First I tell you what this do. 1. It can boost the incomeing voltage and it can lower it. It also regenerates the signal to approximate a sine wave. This thing uses microprocessor to do that. That is good if you voltage has a lot of variable frequency devices, they add harmonics and such! It also has surge protection for utility power and RJ45 like you powerbar or surge buster. RJ45 is Recommended Jack 45 like ieee 802.3 and Ethernet. That a good thing because not may people know about lightning strike make it's way to you networking cables like 4 pair of unshielded twisted pair or some short circuit somewhere in the building or something. This also have heavy battery, I don't weigh it but at least 3 kilos - a lot heavier than APC battery. On the front it have "Battery Fault" light to work when battery not working right like over discharged. It also have "Battery Mode" and "AC Mode". It tell you and "beeps" when power to unit is cut off. This has RS232 port and no USB. I like to use RS 232 because NT Server 4.0 it have trouble with USB. The motherboard it have PS2 for keyboard and mouse so I okay with that.

I got this because the belkin ups I got for the Linux server kept giving me this message:
Broadcast Message from rootlserver01
(/dev/pts/0) at 7:22 ...

UPS Over Temperature!

Broadcast Message from rootlserver01
(/dev/pts/0) at 19:21 ...

UPS Over Temperature Recovered!

and the Belkin ups was loaded to only 29% of capacity, so I tried OPTI-UPS for the NT server. The OPTI-UPS works perfectly. Let the OPTI-UPS charge up for about 4 hours then attach a load to it. I installed it and the software on the XP. Then I reboot the computer - just to be sure and then I unplug the UPS from the wall socket. Do not unplug the computer from the UPS or it will not work! Then the UPS starts beeping and it graacefully shuts down the XP - perfect! With NT Server I had to go to Power Device Manager, Settings, Communications, and change from COM1 to COM2, Save, and reboot, and/or unplug and replug the COM cable in order to get the software to communicate with the UPS. Anyway after it did, I could reboot the computer and everything would work just fine.

This does not work too good with Linux. With Linux you need a web browser to go to the IP number of the computer such as: and "Username:" is admin and "Password:" is 1234. Good luck trying to find help so I will give you where it is: /usr/bin/dnpower/dnpower/help/en/manage.htm. The Graphics are very similar (exactly similar?) to the Windows, but I could not get the needles on the meters to work. All of the text configuration works but not the needled on the meters. For Linux it too hard to fiddle around with all that when Belkin you just "./upsd" and double click on "monitor" or "./monitor" and everything works - no fiddling around with web browsers.

All in all a excellent product but needs a lot of work for Linux!

P.S. I tried Cyberpower, just once and it was a factory defective. It kept chirping and the trouble light is at the BACK of the unit instead of the top or front - go figure.

Experience: 8 Weeks


easy to control
One of the best features is the remote control outlets, there are two sets of outlets on this unit that can be controlled using the web-based software.

Product Videos [ Edit ]

Features [ Edit | History ]


ES-C series offer the highest power capacity and the best equipment protection around. Not only do they protect against blackouts, sags and surges but with the added feature of AVR (Automatic Voltage Regulator) these UPS ensure that only clean and safe currents reach your equipment.

Quick Specs:
Input Voltage 110 V AC
Limited Warranty 3 Year
Output Voltage 120 V AC
Weight (Approximate) 15.50 lb
Form Factor Tower
Switching Time 4 ms
Input Voltage Range 100 V AC - 120 V AC
Height 6.5"
Width 4"
Depth 12.7"
Maximum Battery Recharge Time 4 Hour
Backup/Run Time (Full Load) 2.50 Minute
Load Capacity (VA) 550 VA
Load Capacity (Watt) 330 W

Specifications [ Edit | History ]

Battery Information  
     Backup/Run Time (Full Load): 2.50 Minute
     Backup/Run Time (Half Load): 8 Minute
     Maximum Battery Recharge Time: 4 Hour
     Number of Batteries: 1
General Information  
     Brand Name: Opti Ups
     Manufacturer: Opti Ups Corporation
     Manufacturer Part Number: ES550C
     Manufacturer Website Address: https://www.opti-ups.com
     Product Model: ES550C
     Product Name: ES-C ES550C 550VA Tower UPS
     Product Type: Line-interactive UPS
     Modem (RJ-11): Yes
     Serial Port: Yes
     Certifications & Standards: BSMI, CE, UL , cUL, C-Tick, A-Tick, GOST-R
Physical Characteristics  
     Depth: 12.7"
     Form Factor: Tower
     Height: 6.5"
     Weight (Approximate): 15.50 lb
     Width: 4"
Power Description  
     Input Voltage: 110 V AC
     Input Voltage Range: 100 V AC - 120 V AC
     Load Capacity (VA): 550 VA
     Load Capacity (Watt): 330 W
     Output Voltage: 120 V AC
Technical Information  
     Switching Time: 4 ms
     Limited Warranty: 3 Year

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