You'd need to disconnect the AC from it and listen for the relay to
click. If it doesn't click, then it's on battery. If your DC output
voltage is <27, then it's on battery.
I have like a dozen deployed. They will not run on the AC at <100V
input. We get that all the time at grain legs. They're almost always
3-phase and a leg drops out and we get 60-90VAC.
This is precisely why I wire up a shunt on the negative side of the
battery. I have a little 12VDC switching power supply on the pwr2 input
on the SiteMonitor base. Almost all of them will run happily at 85VAC
input. So I don't get a power alarm when this happens. But I can see
that there's current flowing out of the battery. I'm going to start
ordering some more little linear supplies to monitor the utility. That's
what Forrest used to sell with SyncPipes. Maybe still, I don't know.
They're a 9VDC linear that put out about 13.5VDC with no/light load,
which is perfect. When the utility voltage fluctuates, we see it on the
DC side. But I ran out of them.
Just had all this happen at a site today. And FWIW, I have two 9Ah
batteries on most of the AD-155s. With a 50W load, I usually see 3.5
hours out of them, sometimes more. And the LVD in the AD-155 is pretty
low, like 19 volts. But the batteries are cheap, so I don't care.
If the AD155 wasn't so cheap, or more accurately the Traco stuff wasn't
so expensive, then I'd be putting BCMUs everywhere. But the AD-155 works
good nuf for smaller, less important sites.
On 4/2/2016 7:29 PM, Josh Luthman wrote:
So if it's a light load you can dip below the minimum (88 in this case)?
Josh Luthman
Office: 937-552-2340
Direct: 937-552-2343
1100 Wayne St
Suite 1337
Troy, OH 45373
On Sat, Apr 2, 2016 at 8:26 PM, Chris Fabien <[email protected]
<mailto:[email protected]>> wrote:
Spec sheet says 88 - 260 VAC and you're only pulling half load so
I'd say it's very possible.
