leon_123 Posted January 4, 2018 Share Posted January 4, 2018 Hi guys, I want to purchase a APC Back-UPS to keep my computer safely when the event of power failure occur. My PC use Corsair AX1500i power supply, which is an Active PFC PSU. I read lots of articles on internet that complain about UPS that output stepped sine wave (or simulated) will not function property with Active PFC PSU, recommendation is buy a true sine wave UPS. So which UPS should I choose? Link to comment Share on other sites More sharing options...
Corsair Employee jonnyguru Posted January 5, 2018 Corsair Employee Share Posted January 5, 2018 I read lots of articles on internet that complain about UPS that output stepped sine wave (or simulated) will not function property with SOME Active PFC PSU, recommendation is buy a true sine wave UPS. Fixed for you. Most PC PSUs work fine with simulated sine-wave. Some don't. That said, true sine is still recommended. Especially if you're really pushing that much power. Of course, you know how much power you're using because Link tells you. :D: Link to comment Share on other sites More sharing options...
leon_123 Posted January 6, 2018 Author Share Posted January 6, 2018 Fixed for you. Most PC PSUs work fine with simulated sine-wave. Some don't. That said, true sine is still recommended. Especially if you're really pushing that much power. Of course, you know how much power you're using because Link tells you. :D: Thanks for reply. I'm totally aware of my power usage through the CL app, but the PSU has an inrush draw that could overload the UPS with step approximation sine wave as APC post here: http://www.apc.com/us/en/faqs/FA158939/ I don't know if true sine wave UPS can eliminate that? Link to comment Share on other sites More sharing options...
Corsair Employee jonnyguru Posted January 6, 2018 Corsair Employee Share Posted January 6, 2018 Correct. Most people don't take that into consideration and step approximation sine wave WILL overload the UPS. So what is your max load as per LINK? If you over-compensate, you'll be fine. Link to comment Share on other sites More sharing options...
leon_123 Posted January 6, 2018 Author Share Posted January 6, 2018 Correct. Most people don't take that into consideration and step approximation sine wave WILL overload the UPS. So what is your max load as per LINK? If you over-compensate, you'll be fine. Yeah, that's why I'm considering buy a true sine wave UPS so that I don't have to pay more for the bigger UPS power. With my current specs, I've recorded maximum load about 1100W. Link to comment Share on other sites More sharing options...
Corsair Employee jonnyguru Posted January 6, 2018 Corsair Employee Share Posted January 6, 2018 So, as an FYI, a 1500VA simulated sine wave UPS should be able to support up to 1300W w/o issue. Link to comment Share on other sites More sharing options...
leon_123 Posted January 6, 2018 Author Share Posted January 6, 2018 So, as an FYI, a 1500VA simulated sine wave UPS should be able to support up to 1300W w/o issue. Was the inrush would draw full 1500W from UPS? Link to comment Share on other sites More sharing options...
Corsair Employee jonnyguru Posted January 6, 2018 Corsair Employee Share Posted January 6, 2018 No. That's my point. Link to comment Share on other sites More sharing options...
leon_123 Posted January 6, 2018 Author Share Posted January 6, 2018 No. That's my point. Thanks. And for the pure sine wave UPS, should I follow that too? Link to comment Share on other sites More sharing options...
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