ivbinconned wrote:
The converter is a WFCO 55 amp. I’m sure it’s original In a 2009 Cedar Creek.
Seems to me this converter will not start to even charge if the temps are really low.
Good time to upgrade the converter and stop undercharging the batteries.
Although I assume the WFCO never hits boost voltage putting 14.4 volts on the battery. This is also the reason the charging is terrible at low temperatures.
No particular reason to go 6v in AGM format. I recommend Lifeline if going AGM.
AGM is a bit better at freeze resistance but can still be damaged if low on charge well below freezing.