Some inverter systems keep the inverter running all the time powering the
load so there is never a transfer from mains to inverter power.
Most have a transfer switch of some kind. Relays take some time to switch
and you will be without power for some amount of time.
But many devices can keep running for a few cycles of sine wave before
crashing. I guess it all depends on the load.
-----Original Message-----
From: Nate Burke
Sent: Wednesday, February 21, 2018 11:52 AM
To: af@afmug.com
Subject: Re: [AFMUG] UPS
Not sure what you mean by Hitless, but I've never had a problem with
things rebooting when switching on/off battery. We ran into an
instance at one of our sites where the power company had 2 HV wires
before the transformer that were bouncing into each other. Caused
multiple power issues per second (the fluorescent lights in the building
were acting like strobes) The UPS didn't seem to care, and none of the
equipment rebooted.
On 2/21/2018 12:30 PM, Chuck McCown wrote:
Do they do a hit-less transfer?
-----Original Message----- From: Nate Burke
Sent: Wednesday, February 21, 2018 11:12 AM
To: af@afmug.com
Subject: Re: [AFMUG] UPS
I've been very happy with APC SmartUPS 750XL units. Hook up as much or
as little battery as you want. Internal 18AH or multiple 100+AH (in 24V
strings) Haven't had a failure other than from an external source
(Water, Mice) through multiple Chicago winters/summers. I know it's not
as efficient as a pure DC plant, but I'm only putting out ~$70 for the
UPS + batteries and don't have to worry about multiple voltages for
different equipment.
On 2/21/2018 11:49 AM, Sterling Jacobson wrote:
I use Alpha FXM1100 for my fiber cabinets and four external batteries.
I need something a bit less for a smaller wall mount cabinet.
What are people using now days for small WISP cabinet UPS?
I need to power maybe a couple of 11W routers/switches and maybe 3-6
radios at around 10W peak each.
So maybe 150W power draw keep alive for a few hours.
Would be good if it's temperature tolerant and network manageable.
