Yet another CO detector low voltage question

And the voltage at the battery bank was? (and perhaps at the other place you were measuring?)

The voltage at the detector (with the coach plugged into shore power) is 13.1 volts.

pianotuna wrote:
Measure the voltage at the detector.

Will do that tonight.

They should be sold as audible low voltage alarms...normal operation.

Measure the voltage at the detector.

pianotuna wrote:
Are you measuring at the battery bank or at the terminals for the detector? They use thin wire to save a dime, so there may be voltage drop.

The 11.8 volts is measured at the cigarette lighter "port" on a USB charger with a voltage display. This is in a panel near the cable/satellite connection.

DarkSkySeeker wrote:
My CO detector goes off when the coach batteries reach 11.8V. Most specs I've found indicate detectors run all the way down to 7-8 volts. Is mine at the end of life?

Maybe the spec simply means it will still sound down to 7-8 volts, not that it will sit there quietly and function down to there. You want significant overlap between false sounding and completely dead or a rapidly discharging battery would go from detecting (but quiet) to completely quiet without warning.

rwynkoop wrote:

My detector is new. I replaced it once thinking it was defective due to the beeping.

After replacing it, does it still beep unexpectedly?

My wired detector woke me up for the very last time a few yrs ago,...if ya know what I mean.

I see the same thing with my wired co detector. It starts to beep around less then 12v, 11.8v sounds about right, but the furnace was also running hard on a separate circuit. 11.8 is measured by my solar controller, near the battery.

My detector is new. I replaced it once thinking it was defective due to the beeping.

Robert Wynkoop