On Mar 10, 6:41 am, "download.com" wrote:
"Brenda Ann" wrote in message

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"Ron Hardin" wrote in message
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Has anybody tried getting longer run times from UPS's by plugging
one UPS into another?

Power goess off, the first UPS goes on batteries, and runs everything.
When it quits, the second UPS senses it and goes on batteries, and
runs the computer.

And so indefinitely if you add more UPSs to get more runtime.

It seems it me it would work except possibly :

(1)The UPSs might not like the non-sinewave output of the first UPS, and
(2)I don't know what kind of current they draw if they decide to
recharge their batteries from an outer UPS. (This would suggest it's
wise to unplug the outer UPS when the power goes off so nobody
tries to recharge.)
--

You're not going to extend your runtime near as much as you might think.
If you had an UPS with a clean enough pseudo-sine waveform to even get the
next one in line to power up stably (and you have to get into some very
very good ones to do that, they basically have to be generator rated),
then you have to deal with the issue of the other UPS'es in the chain not
being 100% efficient, so you lose a lot of what you would have gotten from
that first unit in the line. This of course follows up the chain.

Just buy a bigger UPS!!! I use to sell them

Burr- Hide quoted text -

- Show quoted text -

Yes most likely the next-size-up UPS will cost less than
the two smaller ones and be the more Reliable and Co$t
Effective $olution to the Quest for Longer-UPS-Run-Time.

the bigger one is the better one : when the alternative is two
of lessor potential and twice the possibility of failure ~ RHF