Speaking of NMS, is there a consensus as to what is the favorite?
-----Original Message-----
From: Adam Moffett
Sent: Tuesday, January 06, 2015 9:42 AM
To: af@afmug.com
Subject: Re: [AFMUG] 24V UPS
If you just need to know when the power goes out, get a Site Monitor for
$99. It has two power inputs. Connect input 1 to your battery backed
power, and input 2 to a wall wart on an A/C outlet.
Monitor the voltage on the two power inputs in your NMS. When input 2
has zero voltage, then the power is out. Add a current shunt for $20
more and then you can measure your load and voltage, from there you can
estimate your expected run time.
Probably not as easy as the APC management card.
I'm at my end. I've been looking at this for a while now and it's obvious
that no one makes an industrial APC UPS that works.
We've tried the Alpha Cordex (DIN rail) and the ICT (19" rack) and neither
one can do what a APC management card can. We just need it to provide
24vDC to a load and when the AC power goes out, send an alert and let us
monitor the system status via SNMP.
Alpha:
PROS: DIN rail mounted
CONS: Web interface is IE only, SNMP requests are completely broken, have
not tested SNMP traps, cost is about $700.
ICT:
PROS: It works well as a dumb power supply/charger with UPS functionality,
web interface works in all browsers.
CONS: SNMP is limited to about 6 values, all remote communication is lost
when AC is removed, no battery monitoring at all other than the voltage
for use with LV cutoff which is one of the values that is not available
via SNMP. Also costs about $700
I have to give it to Alpha at this point, at least their unit remains
"intelligent" when AC power is removed. If they would fix their web
interface and SNMP it would be perfect.
So... Does anyone have a solution that works that isn't completely cobbled
together? I need to know when we lose/regain AC power, that the battery is
draining, what the battery voltage is so that I know when it's about to
cut off, it needs a LV cut off to protect the batteries, and all this
information needs to be available via SNMP and web. Am I asking for too
much or does something of this nature exist outside of TrippLite and APC?
