Is the battery charge correct?

[tjwoods1]

I have two newly installed 6v batteries (wired in series of course) in my 19’ Flying Cloud. I have a BatteryMinder 128CEC1: 12V 2/4/AMP Battery Charger-Maintainer-Desulfator attached to the batteries while it sits in my driveway until my next trip. The batteries, when on float, read 13.2 on the Airstream panel - which I understand is normal. However, yesterday it was 13.1 and today it reads 12.9. Is it normal for the float charge reading to drop like that? I know 12.6 is 100% charged, but is it normal for the float charge to fluctuate?

[tjwoods1]

I should also mention - temperatures here have risen to the mid 90’s the last two days - and the AS is sitting in the sun. Perhaps the temperature compensation feature is doing it’s job?

[AirMiles]

Charging voltage levels change if the charger is “temperature compensated”. My solar charging system is temperature compensated and the charging voltages for all the stages - bulk, absorption and float - change daily depending on the temperature of the batteries. Cold days get higher voltages and warm days get lower voltages. I’m not sure about your charger, so I would suggest to continue to monitor your voltage daily to see if it continues dropping. Has it been significantly warmer each time you checked the voltage?

[fran&frank]

Check the volatge at the charger with a voltmeter to see if your charger is working the way you think it should.-- Frank