Re: UPS battery replacement causes an . . . interruption

Catching up on a really old message...
Jeff, most rack mounted computer equipment has dual power supplies. If one
fails then the other run can run solo.
Or, in the co-location facilities we use we have two breaker boxes. One
runs off of one UPS the other runs off of the other UPS. The left side of
the rack uses one UPS breaker box and the right side uses the other. You
could consider a similar setup.
I think there's some obscure electrical property which says do not leave
one on UPS and one direct. But you'd have to ask the Larry's, etc of the
world about that.

Another interesting little electrical property. Most computer equipment is
rated from 100-240 input voltage. Down to and including your cell phone
charger. Our co-location centers do not have any 110 in the racks.
Related to that, do not use a household grade power strip there. They are
only rated for 110 and you plug that into 220 and you will see smoke.
Trust me, this I know. If you plan on doing some serious racking in such a
center you might want to check the power supply on the charging unit for
your cordless drill. And look for a wall outlet they use for cleaning
purposes, etc.

On Thu, Jun 8, 2023 at 10:13 AM Jeff Crosby <jlcrosby@xxxxxxxxxxxxxxxx>
wrote:

Our IBM i has been in a data center for several years. Since we no longer
needed the Nfinity UPS for such a small load (Sonicwalls, DNS servers,
switches, etc) we installed a rackmounted Tripp Lite SU1500RTXL2Ua with an
internal battery and an external battery. This gives us just under 2 hours
in a power outage.

Imagine my surprise, now that it's time to replace the batteries, the
internal battery *is* hot swappable, but the external battery is *not* hot
swappable. So we have to shut down the rack to replace the batteries. If
anything, I would have expected the opposite.

It is ironic that replacing the batteries in an "uninterruptible" system
causes an interruption.

--


*Jeff Crosby*
Senior Vice President
UniPro FoodService/Dilgard
P.O. Box 13369
Ft. Wayne, IN 46868-3369
260-422-7531
direct.dilgardfoods.com

The opinions expressed are my own and not necessarily the opinion of my
company. Unless I say so.
--
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