The best way is to run your rack off the inverter 24/7 so it is always on battery.
No glitches that way.
If you are worried about the inverter kicking the bucket, put an ac/ac transfer switch on the output that will switch the loads to mains in the event of an inverter failure. A solid state relay would switch within one cycle. Most things will stay up for that short of time.

-----Original Message----- From: Matt
Sent: Tuesday, November 29, 2016 9:06 AM
To: af@afmug.com
Subject: Re: [AFMUG] Rack Mount UPS

Will something like this work to run my rack until the generator kicks in?

https://www.amazon.com/COTEK-ST1500-112-INVERTER-TRANSFER-SWITCH/dp/B006W9SJD8/



On Tue, Nov 29, 2016 at 9:43 AM, Ken Hohhof <af...@kwisp.com> wrote:
I know Cotek makes a 1U sinewave inverter with automatic transfer switch, you would need a separate battery charger. I had trouble with the Cotek units though, the transfer switch will stay on line power if the voltage is low, plus I think I had a fan fail. Generally, everything is less reliable when crammed into a 1U size.

-----Original Message-----
From: Af [mailto:af-boun...@afmug.com] On Behalf Of Matt
Sent: Tuesday, November 29, 2016 9:03 AM
To: af@afmug.com
Subject: Re: [AFMUG] Rack Mount UPS

This site has a generator already. Is there something I can have wired into the electrical panel to act as a UPS for certain outlets tell the generator starts?


On Tue, Nov 22, 2016 at 5:51 PM, Jaime Solorza <losguyswirel...@gmail.com> wrote:
Doesn't Falcon make 1 and 2 U versions?


On Nov 22, 2016 4:44 PM, "Eric Kuhnke" <eric.kuh...@gmail.com> wrote:

Never seen one. I suppose you could hack it but those things are
12VDC internally (composed of two flat 6V AGM cells) , so you'll be
spending a lot of money on 0 or 2 gauge copper across the room to
avoid significant voltage drop if you're putting batteries remote from where the UPS is.


On Tue, Nov 22, 2016 at 3:36 PM, Matt <matt.mailingli...@gmail.com> wrote:

Anyone know of a 1u rack mount UPS that uses external batteries?
Thinking of running cord across room instead.  I have limited rack
space.

On Tue, Nov 22, 2016 at 4:51 PM, Matt <matt.mailingli...@gmail.com>
wrote:
> Anyone know of a small wall mount UPS?  I need something to hold
> the Ciena 3903x fiber transceiver the telco provided until the
> generator starts.  It actually runs off a 12v wall transformer.






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