Need a good UPS for a 550 W computer PSU.

[captaincandellight]

I need a UPS for my new 550 W computer power supply. Do you know which UPS will be best for a 550W computer power supply. Nothing very expensive either. I just want a UPS that can keep my computer powered on for 10 to 15 minutes til I shut it down during a power outage in my locality. Please let me know. Thank You.

 

[captaincandellight]

I mean I never powered off or shut down the computer completely. The PC was also contentiously on with the UPS for one month. After that one month the UPS started to overload and shout down if kept on for long and crash the PC as well. Please let me know. Thank You.

 

[GhislainG]

Like I said before, the 300W UPS wasn't powerful enough. With a new UPS that's twice as powerful you shouldn't have issues. My APC Smart-UPS are powered on 24x7; the only issues I ever had was with batteries that were too old and could no longer keep their full charge. It's up to you to keep your PC powered on all the time or not. Unlike a server that normally has to be available 24x7, a PC should be shut down or put in sleep mode (my preference) when not in use.

 

[captaincandellight]

So with the APC Power-Saving Back-UPS Pro 1000 with LCD, 230V I will not have the same problem, even though my new PSU is a 550W one right. Please let me know. Thank You.

 

[GhislainG]

It doesn't matter if your PSU is 550W or 1200W; what's important is how much power it draws from the UPS (or the wall outlet). At peak your whole system, including the monitor and other accessories, may draw 300W, but it should be less than 150W at idle. Presuming 85% PSU efficiency, the system may draw up to 350W from the UPS. Presuming 85% efficiency at full load, if your PSU was really drawing 550W (550/85*100 = 650W), then a 600W UPS would obviously be overloaded since all components would draw approximately 700W; if there was a power failure, the UPS would simply shutdown to protect itself.

 

[captaincandellight]

Thank You very much.

 

[captaincandellight]

One last thing is there is another same APC UPS which is without battery. Can you please tell me what is the difference here and if this is a better UPS to go for. Please let me know. Thank You very much.

 

[GhislainG]

That model for India has no internal battery; you'll have to buy an external battery system. The UPS is less expensive, but you sure won't save money and you'll have 2 enclosures (one for the UPS and one for the external battery system).

If you buy the unit without batteries, then you also need to buy http://www.apc.com/products/resource/include/techspec_index.cfm?base_sku=BR24BPG-IN&xtmc=BR24BPG-IN%2520-%2520Back-UPS%2520Pro%2520External%2520Battery%2520Pack%252024V%2520%252C%2520India&xtcr=1 Should you decide on that expensive solution, double-check with APC to make sure this is the correct part number. I found one in India for 6,700 INR.

 

[captaincandellight]

Thank You so much. I am going with the one with internal batteries. Thank You.

 

[GhislainG]

With your limited budget, I sort of expected that would be your final decision. What's the cost difference between an APC Power-Saving Back-UPS Pro 1000 with and without batteries?

 

[captaincandellight]

Their site does not have the prices listed and I have not yet inquired with APC about the price. Thanks a lot for the help.