STUDIO XPS 435T/9000 UPS issues

An uninterruptible power supply, also uninterruptible power source, UPS or battery backup, is an electrical apparatus that provides emergency power to a load when the input power source fails.
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We found out that STUDIO XPS 435T/9000 has challenges when connecting to majority of UPS because of certain sine wave compatibilities. Luckily we also found some answers online

FROM DELL COMMUNITY FORUM
http://en.community.dell.com/forums/t/19309661.aspx

Some XPS desktop systems connected to a UPS (Uninterruptible Power Supply), may turn off or drop power when the UPS is running on its internal battery. This issue is noticed with line interactive UPS units that output a squared, stepped approximated, or quasi sine AC waveform while on battery power. Dell recommends to use UPS that output a true sine waveform while on battery power. Some models are suggested below:

*APC Smart-UPS 750VA USB & Serial 120V, Part number SUA750
*APC Smart-UPS 1000VA USB & Serial 120V, Part number SUA1000US
*Dell 2200VA - 120 Volt UPS, Part number GU085
*Dell 1500VA - 120 Volt UPS, Part number 2K481
*Dell 750VA - 120 Volt UPS, Part numbers U6829
*TrippLite SmartPro 750SLT - UPS - 500 Watt - 750 VA 60Hz AC 120V, Part number SMART750SLT

also a similar answer from APC Forum.

FROM APC FORUM
http://forums.isxusergroups.com/thread.jspa?messageID=16832

"...Yes, the BackUPS line of products output a psuedo-sine wave, which is somewhere between a sine wave and a square wave. Lately, power supplies have been incorporating PFC technology to meet European regulatory requirements and they don't always work with the psuedo-sine wave. In particular, the XPS 9000 does not seem to like it. You would be better served with a SmartUPS."


So there you have it. If you plan to buy a UPS for your system purchase a SmartUPS just to be sure.