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Old 03-05-2016, 04:31 PM   #1
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CO/LP Detector

Having trouble with CO alarms when battery voltage is 11.6 VDC or below. Red/green alternating lights indicating low battery voltage at 11.6 VDC and audible alarm every few seconds. This causes many false alarms. Model 35-742 detector manual says unit operates to 7 VDC. Manufacturer, MTI Industries, sent replacement detector but the problem remains the same with the replacement. I'm contacting MTI again. Guess I have to find a variable DC power supply somewhere to confirm operation rather than discharging the batteries. Anyone with same problems?
Thx, Russ
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Old 03-05-2016, 05:05 PM   #2
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If you have a battery voltage of 11.6 the battery voltage is too low. That voltage equates to discharged. See attached. Other appliances fridge and furnace will not operate here.


Average Open circuit voltage
Approximate state-of-charge
specific gravity 2V 6V 8V 12V
100% 1.265 2.1 6.32 8.43 12.65
75% 1.225 2.08 6.22 8. 30 12.45
50% 1.19 2.04 6.12 8.16 12.24
25% 1.155 2.01 6.03 8.04 12.06
0% 1.12 1.98 5.95 7.72 11.89
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Old 03-05-2016, 06:17 PM   #3
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Basically, you may have damaged your battery letting it get that low.
As was said, low battery is #1 cause of CO/LP detectors going off.
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Old 03-06-2016, 06:11 PM   #4
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CO/LP detector

Guess I'm not up to date on batteries. Seems to me that a 12 V battery when under load would start out at about 12 V and slowly (depending upon current draw) decrease to 0 V. The CO detector advertises that it works to as low as 7 VDC. So I start out with 12 VDC battery applied to the detector and its load slowly decreases the battery voltage. The detector should work until its load decreases the voltage available in the battery to 7 VDC. I'm thinking of a flashlight beam dimming as the batteries weaken or E=IR.
Am I wrong?
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Old 03-09-2016, 07:22 PM   #5
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A fully charged 12 volt lead-acid battery has about 12.7 volts, as per Flybob's table. "12 volts" is a nominal, rounded off number that's easier to discuss that 12.7. A "12 volt" alternator can put out over 14 volts.
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Old 03-10-2016, 09:33 PM   #6
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I have a 2014 mini lite # 2306 . I have had trouble with the co detector from the start . The same (similar ) situation . I might have as much as 12.6 volts showing on my volt meter and in the middle of the night ...BEEP . My dealer actually replaced the co detector ... still BEEP . The same blinking lights . I recently got another volt meter . I attached it to the wire where the dealer guys replaced the first co detector . It showed the same voltage as the other voltage meter . I turned on lights , the radio , the tv , there was just a little variance maybe .2 of a volt from the one closer to the battery . All with no issues . Then, I turned on the fridge ! The voltage on the co detector dropped to 11 , then 10.9 then fluctuated between 10.0 and 11 volts ... no wonder the thing was going off . My other volt meter still shows 12.6 volts !??? I checked the specific gravity of my battery cells , they are okay . I , like you am lost and not sure where to go from here . all this was done while unplugged , if that matters .
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Old 03-20-2016, 12:57 PM   #7
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Quote:
Originally Posted by lbmaples View Post
I have a 2014 mini lite # 2306 . I have had trouble with the co detector from the start . The same (similar ) situation . I might have as much as 12.6 volts showing on my volt meter and in the middle of the night ...BEEP . My dealer actually replaced the co detector ... still BEEP . The same blinking lights . I recently got another volt meter . I attached it to the wire where the dealer guys replaced the first co detector . It showed the same voltage as the other voltage meter . I turned on lights , the radio , the tv , there was just a little variance maybe .2 of a volt from the one closer to the battery . All with no issues . Then, I turned on the fridge ! The voltage on the co detector dropped to 11 , then 10.9 then fluctuated between 10.0 and 11 volts ... no wonder the thing was going off . My other volt meter still shows 12.6 volts !??? I checked the specific gravity of my battery cells , they are okay . I , like you am lost and not sure where to go from here . all this was done while unplugged , if that matters .
This is my issue also except I don't have to plug in the frig to get alarms. The detector manual says the detector will work down to 7 volts. It apparently doesn't. I sent my detector back to the factory (MTI) and they say it works to 10 volts but they don't test them lower. They sent me a new replacement. We'll see what happens when I get it installed and checked out.
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Old 03-22-2016, 09:11 AM   #8
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CO/LP Detector

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