On Nov 29, 2010, at 7:28 PM, Brad Knowles wrote: > The BackUPS units and even some of the SmartUPS units do generate > step-approximated sine waves -- you have to check the individual descriptions > of each unit to see if they advertise it as generating a "pure sine wave" or > not. Any unit where they don't advertise generation of a "pure sine wave" > means that they use step-approximated sine waves instead.
In particular, the SmartUPS SC models do not generate pure sine wave output. They even say so on their web page -- check out <http://www.apc.com/products/resource/include/techspec_index.cfm?base_sku=SC450RM1U&total_watts=50>, where they state that the APC Smart-UPS SC 450VA 120V - 1U Rackmount/Tower generates "Stepped approximation to a sinewave". > In other words, basically each computer has a dedicated UPS built-in, and > they don't make any attempt to provide any kind of whole-room style of UPS. This is on systems where they provide high voltage DC power direct to the container, so at most you need a DC-DC voltage conversion (to step the power down to the 5VDC and 12VDC that most computers need on input), which is a lot less wasteful than doing an AC-DC conversion. -- Brad Knowles <[email protected]> LinkedIn Profile: <http://tinyurl.com/y8kpxu> _______________________________________________ Tech mailing list [email protected] https://lists.lopsa.org/cgi-bin/mailman/listinfo/tech This list provided by the League of Professional System Administrators http://lopsa.org/
