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UPS Simulated sinewave - a No go !

By 7skipper7 ·
Again, Another Dirty Little Secret in the Computer Industry !

Dell Computer has chosen to make their fast, advanced studio XPS 9000 computer with Windows 7, using a 'New Power Supply' that is INCOMPATABLE with all reasonably priced UPS units that use "simulated sinewave" technology".

. . . Several weeks ago . . .
In an attempt to protect my data I purchased a Diablotek 5600vr $45.00, 'no-name' UPS only to discover, weeks later, during several quick power outages that it didn't protect! - Next I opted for an inexpensive $57.00, known, APC UPS unit - only to find that it didn't work with the XPS 9000 either! With a call to APC I was informed that I would need a "pure sine wave" unit costing over $350.00 because of Dell's new power supply. . . . Oh dear!

Later, at a local computer store, the technician told me "all I needed was a more powerful unit" & that he had no such problem with any of his computers. Before I purchased at Best Buy a much more powerful Ciber Power "Reliability, Quality, Value" - Battery Backup, 1350VA, 810 watts @ $145.00, I asked their "geek" if it would work with my Dell, studio XPS 9000 and he said "Yes", so... off I went with what I thought was the answer. After several quick tests with the computer I sadly discovered that even the mighty Ciber Power didn't keep the XPS 9000 from rebooting during power a failure. Oh My! ... So, I called Dell [ ha! - India ] and was finally told I would need a $481.00! APC, 750V Pure sine wave "Smart-UPS". ! Even the quoted price went up!

So... there you have it:

Yet Again, Another Dirty Little Secret in the Computer Industry !

What does work: Cyber Power's PP 1100 UPS with 'pure sinewave' ! For $248.54 from for $100 more then the first Cyber Power - at least I have protection!

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Probably cheaper...

by TobiF In reply to UPS Simulated sinewave - ...

to replace the PSU...

And, in general, laptops have been fed with unclean DC (direct current) for many years. Soon time to do the same in desktops. (Or, at least, add a connection on the PSU to an optional battery unit.)

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Yes and no

by NickNielsen In reply to Probably cheaper...

Yes, the output from a laptop power brick is very dirty, with a large amount of ripple and switching spikes. But that output is only used to charge the battery, not run the laptop. A well-designed laptop uses the battery output to provide the 12 volts, then regulates that down to 5 and 2.8-3.5 volts for use on the mainboard and in the CPU.

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I find this

by seanferd In reply to Yes and no

very enlightening.

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In other words - don't buy a demo-ex lappie!

by TobiF In reply to Yes and no

Since most shops will demo laptops on AC only, and keep the battery somewhere else.

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BTW, the OP PC is a desktop.... the XPS 9000 is a high-end desktop

by robo_dev In reply to In other words - don't bu ...

It would be cheaper to swap it's PSU for one that plays well with pseudo-sinusoidal waveforms as found with cheaper UPS units.

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It shouldn't have a problem in the first place

by NickNielsen In reply to BTW, the OP PC is a deskt ...

As long as the RMS voltage at the input is 120 VAC and the average power within specs, it should play nice with any AC power source. That it doesn't is, I think, more a design deficiency than an intentional achievement.

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Things like this are to be expected

by HAL 9000 Moderator In reply to UPS Simulated sinewave - ...

These units are cheap and nasty well the Power Supply at least. I like ones which provide protection to the internals of the case. Many just provide power and no protection. They still work after passing Spikes into the case and destroying the internal Electronics.

I prefer ones that will sacrifice themselves to protect the Internal Electronics. Sure they are more expensive to begin with but they offer a far superior protection to the computer.

So here I would be tearing out the PS and replacing it with one of the High End Name Brands and if it was me doing the work it would be getting an Antec PS, Those work, provide a unsurpassed level of protection and will work with any UPS.

The one that Dell is using in this unit lacks anywhere near enough Capacitance and has to have a Pure Sine Wave input to work. It's the sign of a poorly designed PS but as it's Cheap it meats Dell's needs.

Just my humble opinion and 2 cents worth.


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