RV duty propane, CO, and smoke detectors
My detectors are hard wired into the 12V system of the camper, on the same circuit as the overhead lights. Even when plugged into shore power, one of the detectors starts beeping about low voltage ...
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Propane detectors have a replace after date on them somewhere, on the back side on mine that are also hard wired. The replace after date gave it something like a 5-6 yr life span. I think if you look yours will be well past the replace after date. That may solve your problem.
