WANNA CHALLENGE?
Try and find an adjustable high and low voltage 120vac alarm? I can't even find an outage alarm for use with UPS that gives a discreet "chirp" every so often when on battery.
Forum Discussion
MEXICOWANDERER wrote:
I was foolish to not post details describing how what where and why of the power outage alarm. Forgive me.
Plugs into a 2-prong non polarized (Mexican) outlet.
My 30 watt LED reading light, Bi-Pap and fan are all 12-volt
Running UPS through the Lifeline and 55-amp WifCo
When the power goes out I don't know it.
I need to switch over to 10 watt LEDs, the fan on slowest speed and if shove comes to punch the BiPap humidifier completely off.
I -could- buy another 400 amp Schottky rectifier and isolate the output power of the WifCo and DPDT control that using 12 volts from the Lifeline. The extreme amperage of the Schottky is to keep vf to a minimum, maybe .215 or so.
But the blip (perhaps 20ms every 30 seconds, 70db 1KHz) piezo annunciator is a challenge. Maybe use a 10K uf cap connected to the Schottky input to power the piezo power circuit for a limited time.
IOW I want to know when I lose power. I -could- build a load shed center but that would go over really big hauling it in and out of a hotel room. But then again...
Too many of those 2,170,000 "hits" include stuff like the following...
Part No.
361A-V0-DMRN-DIN-NCR
Description
Alarm, 10 to 36V DC-power; 0 to 10V DC, 100K ohm input impedance; dual alarm, two SPDT relays; DIN rail G or T mount; no certification/approval required.
Price (in $USD)
$402.50
Over thinking a very simple "task" if all you want is to "know" when the power goes out.
You don't need fancy gadgets for that task.
Can be as simple as..
Simply need a wall wart, one SPDT relay, one sonalert, one battery and one SPST switch.
Choose wall wart voltage to match the relay coil voltage and battery to sonalert voltage.
Use the common and NC (normally closed)connection on the relay.
Plug wall wart in relay is pulled to NO (normally open), close the switch and you are ready to hear all the power outages you want.
A power outage happens relay drops out of NO to NC, this now allows current to flow as long as the switch is turned on.. You can turn the switch off to silence the alarm..
If you want a delay action on the alarm then add some additional filter caps to the power supply.. This will give some time delay before the relay drops out.
If you want some "load shedding" you could use a DPDT relay and use the extra relay connections to switch other items on/off..
