power question

[Band Of One]

I'm in south Louisiana. It snowed today for the first time in twenty years. The high today is only about 30 degrees. I'm not sure if that is related to my situation but here is what is happening.
I'm plugged into shore power at my shop. I have a 2023 26 foot Flagstaff 25 FBLS TT. I was out checking to make sure heater is working and I have water in the holding tanks with the tank heater on. I'm hearing a click/tick sound about every 8 seconds near the batteries (i have two connected together). The volt meter drops a couple of volts and the lights blink when I hear the click/tick. everything seems to be working fine and fridge is on. I unplugged from shore power and it is still doing it so I'm guessing it's battery power related but I don't know. Any ides as to what is going on?
Glenn

[Paul_D]

Is there a self reseting circuit breaker between the batteries?
If so, one battery could be bad and pulling the other one down, until the breaker opens, then the breaker resets and the whole cycle starts again.

Could also be the converter or a breaker on the dc output from the converter.

If you have a voltmeter, measure the batteries, disconnect the batteries before measuring the voltage. If one is significantly lower voltage, you might have a bad battery.

[Band Of One]

Thank you for the reply. The click/tick has stopped. Batteries are showing full charge but they were showing that when the sound started. It's really cold and I'm old so I'll wait to test each battery when it warms up a bit. Whatever was causing the issue seems to be resolved.
Glenn