[K12OSN] is there a UPS known to work with K12LTSP?

[Huck]

UPS's are really to keep the machine alive when there is a power outage 
=) and then when UPS runs out of juice to call a clean shutdown.
so you don't have a fatal crash(happened just 2 days ago to me)
a little fsck later everything was back up and running.
and I thought APC made one with a serial interface for linux.

And on a side note...
how to calculate the SIZE of the UPS needed?
say I want to be sure the machines stay live for 1hr,

Found this for APC models...
below is the link to the manual
http://www.2buyups.com/2buyups/manuals/SU45070010014002230.pdf

Typical On-Battery Run Time Versus Load, in Minutes
Model   450 700 1000 1400 2200 3000 3000 w/ext. batt.
50   VA 100 140  150  251  366  297  640
75   VA 77  113  125  199  309  258  557
100  VA 54   85  100  163  268  228  491
150  VA 33   55   75  118  209  183  394
200  VA 22   38   58   90  170  152  328
250  VA 15   26   44   71  142  128  281
300  VA 11   20   36   57  121  110  245
350  VA  8   17   28   47  104   96  216
400  VA  5   14   24   39   91   84  193
450  VA  4   11   20   33   80   75  174
500  VA  -    9   18   29   71   67  157
550  VA  -    8   15   25   64   60  143
600  VA  -    6   13   21   57   54  131
700  VA  -    5   11   18   46   44  112
800  VA  -    -    9   15   38   36   96
900  VA  -    -    7   12   32   31   84
1000 VA  -    -    6   11   27   26   73
1200 VA  -    -    -    8   21   20   58
1400 VA  -    -    -    7   17   16   46
1600 VA  -    -    -    -   14   13   37
2000 VA  -    -    -    -   10   10   26
2200 VA  -    -    -    -    8    8   22
2500 VA  -    -    -    -    -    7   18
3000 VA  -    -    -    -    -    5   13

--Huck

David Whitmer wrote:
> Hi everyone,
> 
> There are some UPS (uninterruptible power supply)
> units available that, when connected to a Windows PC
> (whether via USB or serial port), can instruct that PC
> to shutdown when there is a power outage.
> 
> Does anyone know of a UPS that can do this with a
> computer running K12LTSP 4.2?  Any help would be
> greatly appreciated.
> 
> David Whitmer
> 
> 
> 
> 
> 		
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