| reply to diablo1892
Re: Looking for a desktop power backup IMHO I like APC's Smart-UPS line up because they (read the specs because I think they have a few models that don't) output a pure sine wave, just like what comes out of the wall socket. Granted with a good PSU that isn't being taxed (one that is over-sized for the build) probably would not mind a unit that did step-sine output such as there Back-UPS pro line up which you will find are less expensive.
Here is a link to a guy that took the time to graph the output of both types of UPS's: »www.repeater-builder.com/backup-···est.html (  thanks to WA1MIK for doing this test! )
As you can see a the stepped type UPS output sits at zero volts for a sizable amount of time, this means those that capacitors inside the first stage of your PSU to drain down a bit farther when operating on battery mode which could stress things more.
Read the specs, most of the stuff is listed in volt amps (VA) which is not the same as Watts (W), they are not the same thing. A good UPS should last for years, or several computer systems. |
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public
join:2002-01-19
Santa Clara, CA | said by Thane_Bitter:IMHO I like APC's Smart-UPS line up because they (read the specs because I think they have a few models that don't) output a pure sine wave, just like what comes out of the wall socket. Granted with a good PSU that isn't being taxed (one that is over-sized for the build) probably would not mind a unit that did step-sine output such as there Back-UPS pro line up which you will find are less expensive. Used apc su700 or bigger costs close to nothing.
Biggest plus is the network management card for remote access,
biggest minus is floating batteries at over 14,4V per 12V battery |
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| said by public:biggest minus is floating batteries at over 14,4V per 12V battery
14.4V ?!?! 
I think that's OK for charging gel batteries, but too high for float. Would it be possible to adjust it?
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Wacky Races 2012! |
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 SmokChsrWho let the magic smoke out?Premium
join:2006-03-17
Saint Augustine, FL | Likely is, but getting the info is another story. I don't know what it is about the UPS industry, but I haven't found any of them that are willing to give any info on their units. I did get schematics from one company a while back, but I had to sign a NDA to get it. |
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public
join:2002-01-19
Santa Clara, CA | reply to aurgathor
said by aurgathor:said by public:biggest minus is floating batteries at over 14,4V per 12V battery
14.4V ?!?! I think that's OK for charging gel batteries, but too high for float. Would it be possible to adjust it? Probably changing a resistor. The board is absurdly complex.
A simple solution is to add diodes. |
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