New batteries - odd behavior

[Diatom]

Replaced spent FLAs with AGMs.
Per instructions/manuals set Pro Mariner Combi to one of the two AGM settings:
Position #2 Boost charge voltage 14.1V, Float charge voltage 13.4
Position #3 Boost charge voltage 14.6V, Float charge voltage 13.7
Installer specified setting #2
I get immediate beeping from old Xintex CO monitor upon switching to shore power and notice (not sure this is new) yellow charging light on Combi is flashing yellow.
CO monitor behavior details: beeps 1, 2 or 3 times every ~33 seconds. Green power LED flashing. Red alarm LED off. Case is stamped with code = "voltage" (low/hi voltage alarm?).
After a while combi flashing stops & so does CO monitor beeping, lights normal. Repeats the next time I replace shore power.

Can anyone tell me what's going on?

/tmm

 

[Diatom]

Answering my own question, maybe it will save someone from destroying their batteries:
Hanging upside down to focus geriatric eyes upon Pro Mariner panel I mistook the infinitesimal pointer on the tiny knobless selector rod for an abbreviated tail. Thus my 2 o'clock position was in fact 7 o'clock = calcium 15.1 V charge.
BRNKL faithfully reported overcharge, iPhone photo of the control illuminated the obvious.
Apparently Xintex CO monitor doubles as a high voltage detector.

Now to find out if I have the pleasure of re-purchasing a whole new battery bank... and maybe a new Xintex canary.

/tmm

 

[knotflying]

Glad you found your issue. This is why I am a proponent of Flooded. Most battery failures are a result of inadvertent owner error. I would rather replace a $90.00 battery tank a $200 battery. I replace my flooded batteries every three years regardless of condition. Never had an issue with my battery bank. Hopefully your batteries have survived, but perhaps the longevity was compromised. On a side note the CO detector is a great sourse for low and high voltage. 😀

 

[BB marine]

I'm glad you found the culprit. I thought about your issue but could not come up with a suggestion on a (high/Low) voltage alarm going off when the 120V AC panel was turned on. If the battery bank's voltage was depleted the alarm would be going off when you got to the boat. Turning the 120V system on would shut the alarm off because the charger would increase the voltage. ( Unless the battery was completely dead) In this case the alarm would not go off either no power to alarm and the battery charger would not recognize the battery in a fully discharged state. So no charge. My next thought was a defective battery charger that is not regulating the voltage.This would cause the charger to over charge the batteries to a voltage above the operating threshold of the CO detector. My question was, why would it fail after installing new batteries? When I troubleshoot I always ask the question, What did it do or you do before the component failure? I did not get past changed the batteries. You did state you changed the charging profile of the charger.

Cudo's to you for back tracking your steps and troubleshooting the issue. I have never had Calcium Batteries and did not know the charging profile was that high. I looked today and yes it is.