[time-nuts] Oscilloquartz BVA has been sold. Thank you all who expressed an interest.

[Greg Maxwell]

On Sat, Sep 26, 2020 at 7:36 AM Hal Murray <hmurray at megapathdsl.net> wrote:

>
> >> Can't I just use a high quality APC backup power system
> >> like we use to power racks of gear in our Telco and compute closets?
>
> > Very few UPS's are good at long-run applications, they are typically
> built to
> > run a heavy load for minutes, not a tiny load for hours or even days on
> end.
>
> That matches my expectations, but somebody might expect their telco gear
> to
> stay up longer than the few minutes it takes to cleanly shut down a
> computer.
>
> Is there a branch of UPS gear aimed at telco rather than computers?  That
> is
> good efficiency at low power and long time rather than high power for
> short
> time.
>
> Does all telco gear that is expected to run off UPS take 48V?
>

48VDC is common. Historically facilities that provide highly available AC
usually do so via generator. The UPSes just need to last long enough for
the generators to start.

Keep in mind that during a long run HVAC needs to be supported too.