[time-nuts] Oncore battery backup

[paul swed]

My 2 cents is that a UPS is very inefficient on power conversion. If all you
want to do is preserver the almanac. Lets say a 10 ua need. If on the other
hand you want to keep everything running then larger batteries make sense.
Accept for one gotcha. The chargers on the small UPS's 70-100 watt class are
not really set up to do a good job on a much larger battery set.
With humor they aren't very good for small batteries either.
Regards
Paul.

On Wed, Apr 6, 2011 at 2:25 PM, Murray Greenman
<Murray.Greenman at rakon.com>wrote:

> Why not just put a bigger battery in your UPS? I have a couple of old
> ones, and they run just fine with an old car battery, and thus give me
> many hours of backup for my Trimble/Nortel GPSDO.
>
> Just be careful though - in some UPS units the battery is live to the
> mains! The APC ones seem to be OK.
>
> Murray
>
>
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