|Lee Marzke on 8 May 2009 19:15:25 -0700|
I've never liked the design of the really small units, though I have used them
to provide power to WiFi mesh routers ( very low load ) FYI, the VA rating of the UPS does not indicate how long it will run. VA = Volts*Amps = WattsThe runtime is related to the energy stored in the batteries, e.g. Watts*Seconds (Joules) and this
is not usually listed.So an inexpensive 700VA UPS could have a much shorter runtime than a very expensive
700VA UPS, and you really have to look at the manufacturers runtime charts. The following was discussed at PLUG central a few nights ago. 1. Network UPS tools ( NUT) package has support for lots of UPS's suggest picking a UPS supported by NUT.2. APC brand is generally regarded as 'it just works' , but may not be the least expensive.
3. You may want to power your ethernet switch and/or a monitor. ( So you can shutdown
the unit from monitor or ssh in case the auto shutdown doesn't work )Personally, I think a refurbished older commercial unit (e.g. Ebay Smart UPS 700 ) may be quite affordable for you, just get it with new batteries and change them every 2 years - even if they test OK.
The older units are serial - not USB, and generally less expensive.These units also regulate the voltage ( boost or buck ) to keep the output near 120 V, and they
also act as surge protectors.For my office I've only used APC Smart UPS 700, 1400 units and they have been flawless for 5+ years.
The SmartUPS 1400 3U Rack Mount is particularly beefy, the thing weights nearly 100lbs ! But be aware the serial cable is not a normal cable -you need to make or buy the special one.
Lee Casey Bralla wrote:
During the last thunderstorm, my power went out for about 3 minutes. naturally, 2 of my UPSs failed to hold on and then was totally dead afterwards. I have been underwhelmed by the reliability of the UPSs I have bought. After investigation, I find the batteries themselves usually still have a charge, but the charging circuitry is fried.Most power outages last just a few seconds. I don't care about monitors and such, so I have only the main CPU box plugged in to these puppies. I had thought this meant that I could buy low cost, low capacity units. Maybe I was wrong.Are any of them any good?
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