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#1
03-01-2013, 06:57 AM
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PSU and Pure Sine Wave UPS - Anyway to tell for sure???
Short of testing it out in the real world or seeing if someone else tested it out, is there anyway to tell if your PSU will work with a UPS that doesn't output a pure sine wave? Are higher efficiency PSUs more temperamental about these things, e.g., 80 plus bronze versus 90 plus platinum or gold?Thanks
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Multi-Quote| 03-01-2013, 06:57 AM | |
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#2
03-01-2013, 08:06 AM
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not really an issue any UPS that is sold for computers should work fine I have never heard of an issue with ANY UPS as a matter of fact.
Only issues have been people using cheap generators |
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#3
03-01-2013, 08:40 AM
I could have sworn there were tons of people claiming up and down that their 80 plus PSUs wouldn't work without true sine wave output. I guess I can chalk it up to Internet BS. If anyone else has anything to say about this topic please chime in. |
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#4
03-01-2013, 09:33 AM
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did they say it won't work at all or is the psu just not as efficient?
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#5
03-01-2013, 09:37 AM
I was just wondering what the story was because I just bought a 80 plus platinum PSU. Turns out my 10 year PSU doesn't have enough juice to run my CPU and GPU at full bore. Works great for basic tasks but once you peg the GPU and CPU at the same time it shuts off after a few minutes and it isn't the temps since I was monitoring temps the whole time. I'll obviously test it when I get it on Monday. |
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#6
03-01-2013, 10:11 AM
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I have a dell computer at work that needs a pure sine wave UPS. With a cheaper non sine wave ups when the power goes out so does the computer. It does not work at all on battery.
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#7
03-01-2013, 10:20 AM
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well can't speak for your Dell but i have used cheap 350 VA UPS with my home Dell PCs, Pure Sine Wave UPS are pretty pricy.
Dell sells cheapo UPS on their web site would be pretty funny to call and complain it would not work with their PCs? http://accessories.us.dell.com/sn...dellSearch |
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#8
03-01-2013, 10:28 AM
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#9
03-01-2013, 10:53 AM
I did see discussion that crappy PSUs might not be able to handle the switchover delay from the UPS and that pure sine wave UPSs might do a better job of this, i.e., higher quality components. I'd be curious if his Dell craps out because of the switching or because of the sine wave. Last edited by brbubba; 03-01-2013 at 10:55 AM.. |
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#10
03-01-2013, 12:52 PM
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It is not completely a sine wave issue.
It is more of a compatibility issue. For instance, we use a cheapo brand called Omega 650 watt (costs approx 50 bux) and they work flawlessly, yet there are Tripp Lite models of much greater quality, that simply won't work. If you want to know if a given model will work, you Google it to see if others have successfully used the model without issues, and there is your answer.. BTW: When I say that they won't work, it's not that they couldn't drive the computer, but they don't switch over when the power goes out and the inverter takes over. They don't recognize the power from the inverter, thus they stay on battery, rather than let the power through and recharge the battery. They are probably looking for a purer form of electricity, IE: sinewave of X amounts of volts, before they will switch back to the main power input. No doubt, if the Tripp Lite that I mentioned was hooked up to a pure sinewave inverter, it would perform properly, but on the other hand, UPS devices don't all have such high standards of what constitutes good enough electricity, to warrant allowing it through to power the devices plugged into it. |
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#11
03-01-2013, 12:57 PM
That being said, some PSU's have better caps that others, for storing power for a short period of time, while the UPS switches. http://www.prodacom.com/index.php...dp650.html http://www.omega.com.tw/UPS-441651.asp http://listado.mercadolibre.com.d...e-inversor I'm not sure that they are even sold in North America. |
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#12
03-02-2013, 09:04 AM
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While there may be a correlation between quality and need for a pure sine wave UPS, even some good PSUs require it. A few months ago I was shopping for a PSU and almost purchased an Antec when I read a Newegg review by someone who claimed that it didn't work with his UPS. An Antec rep replied. stating that it required a pure sine wave UPS.
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#13
03-02-2013, 01:25 PM
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In theory a well designed psu and ups should each shutdown in the event that they're operating outside of their designed specs. It's kind of a tricky thing.
A modified sine wave inverter outputs a waveform that doesn't look like a typical sine wave that results in faster changes in voltage and current that a true sine wave. Capacitors resist changes in voltage and inductors resist changes in current. An ideal purely resistive load has a power factor of 1 and would always work great with a UPS. A switch mode power supply (smps) doesn't have a power factor of 1. Theoretically an ideal PFC corrected PSU would work fine on a UPS, the UPS might even run a little more efficiently and be quieter. We don't live in an ideal world. PSU's use two types of PFC, active and passive. Passive PFC uses Capacitors and resistors to shift the PF closer to 1. A UPS is going to have limits to the type of load it can handle, if a load is too capacitive or too inductive it may fall out of regulation -- as long as it's within these limits, a psu with passive PFC should work fine on a UPS. Active PFC does fancier things to correct the PF but depending on the design it may not appreciate a modified sine wave input, it's hard to know for sure -- there's definitely potential for problems, consult the mfg. UPS capacities are rated in VA or apparent power. So a PSU with a higher PF actually won't require as large of a UPS, but may require a true sine wave inverter. Here are some relevant links that get my stamp of approval for the quality of the information they contain: http://www.apcmedia.com/salestool..._R1_EN.pdf http://www.wholesalesolar.com/pdf...odsine.pdf http://www.dansdata.com/gz028.htm http://www.dansdata.com/diyups.htm http://www.microconsultants.com/t...articl.htm Last edited by jkee; 03-02-2013 at 01:28 PM.. |
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