I'd rather be sailing
Join Date: Jul 2006
Location: The state of s/v/ Pelican
Thanked 3 Times in 3 Posts
Rep Power: 11
Battery showing charging when no charge applied
We're having a strange issue... and I thought all of our battery issues were gone when we replaced them in Ft. Lauderdale. We currently have 4 slimline AGM batteries, total 800AH. There's a Xantrex 1000 hooked up to them to monitor, and I've verified the accuracy of its reading. Today, we used all of about 250AH of capacity, and a few hours ago everything was reading correctly. I was just glancing at the Xantrex a few minutes ago, and it showed us at 98AH used (I know it's an estimate based on discharge and charge, but the point is that it thinks there has been a substantial charge to the batteries) and the battery voltage at 12.35v. It also showed that the batteries are receiving a charge - at times it's reading it as over 500AH of charge, and then it goes back to the proper discharge of -3.9, and then back up to a positive charge, etc. - but the generator, engine, etc. are not running. Obviously, a 500AH charge is never going to happen anyway, so it's a false reading of some sort. First off, I don't understand how the bank is at 12.35v. It should be closer to 12.5v-12.6v with the discharge state it was in a few hours ago. Second, where should I start looking for the reason why I'm showing a positive charge to the batteries when there shouldn't be one? All of the cables are new, terminals are new, and everything has been properly sized. The charger is new too, but the charger should be irrelevant since it's not even on. Any thoughts? Chris
s/v "Pelican" Passport 40 #076- Finished Cruising - for the moment -
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"Don't dream your life, live your dream" - Bob Bitchin'
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