Prev: iPad vs Tablet PC
Next: Anybody use Linux? For old hardware, which distro?
From: Mark F on 7 Jun 2010 16:25
On Sun, 06 Jun 2010 14:40:09 -0500, Sam E <no.email(a)all.invalid>
wrote:

> On Tue, 01 Jun 2010 18:45:10 -0400, LSMFT <boleyn7(a)aol.com> wrote:
>
> >YKhan wrote:
> >> I'm wondering if there are any dangers or precautions to putting a
> >> couple of UPS's in series to increase their power-on time?
> >>
> >> Yousuf Khan
> >
> >Series would double the voltage and blow your stuff up.
>
> That's funny. I hadn't thought of connecting the OUTPUTS in series.
I think he means to connect the output of UPS 1 to the input of UPS 2.

APC says this is not permitted. I assume it is because the UPS 1
output may not even be near a sine wave and that APC is afraid UPS 2
will choke on it, or possibly even cause such a strangely shaped load
on UPS 1 that UPS 1 will fail in a bad way.

However, I have used a APC Smart-UPS 1000's feed several models of
APC Back-UPS with no visible problems. (I had a computer running on
an APC Backups model with limited capacity, so I ran an extension cord
from a Smart-UPS to the Back-UPS so that my job could run for several
hours instead of the 15 minutes from the Back-UPS. Possibly I
risked fire and/or explosion, but so what.)
From: edfair on 7 Jun 2010 23:55

Without trying it to see what would happen it is just a guess.

I suspect that the load of the second on the output of the first would
shut the first one down and you would end up with the support time of
the last one.

I do load splitting among 4. Computers only on 3 and add the monitor
to the CPU on the 4th. The 3 wallwarts have their own and the printer
and landline modem are unprotected.


First  |  Prev  | 
Pages: 1 2 3
Prev: iPad vs Tablet PC
Next: Anybody use Linux? For old hardware, which distro?