[time-nuts] Power Back-up

[WarrenS]

Keep in mind that the batteries are not the only thing on small cheap Domestic UPS's that are rated for minutes. Same goes with their electronics, Heatsink etc.
You would have to seriously derate them for continuous duty, and even then it may not be save.
And in some cases the equipment connected to them should not be run on them for more than a short time either, because of their output wave form.
All and all not such a good idea unless you are real careful with what you use and connect them to. Best to at start with an inverter rated for continuous duty.

ws

****************

----- Original Message ----- 
From: "Robert Atkinson" <robert8rpi at yahoo.co.uk>
To: "Discussion of precise time and frequency measurement" <time-nuts at febo.com>
Sent: Sunday, August 09, 2009 2:03 AM
Subject: Re: [time-nuts] Power Back-up


One option for a small setup (few hundred watts) is to use one of the small "domestic" UPS's connected to a larger external battery bank. Even the big server UPS's are only rated for minutes at full load. This is enough to switch to a generator or a claen shutdown. Unfortunatly efficency at low loads is not a priority. As a result the load / hold-up time does not scale in a linear fashion. 

Robert.

--- On Sun, 9/8/09, gsteinba52 at aol.com <gsteinba52 at aol.com> wrote:

> From: gsteinba52 at aol.com <gsteinba52 at aol.com>
> Subject: [time-nuts] Power Back-up
> To: time-nuts at febo.com
> Date: Sunday, 9 August, 2009, 5:55 AM
> Weather projections for California
> this winter are WET, which implies local power failures
> (lasting up to perhaps eight hours).
> 
> What do time-nuts do for backup power? I have one of the
> TAPR TBolt systems along with numerous other toys (OCXOs
> that should probably be kept running to avoid retrace
> errors). Automobile batteries? UPS inverter systems?
> 
> Thanks,
> Jerry
> _______________________________________________
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
>