I had a similar issue with mine. Turned out I had a combination of problems:
1) The AM/FM/Cassette radio on the boat wasn't completely "off". I had botched the wiring on the "memory" wire (was too lazy to run a separate wire for that...). I would have thought that as long as the radio was "off", it shouldn't draw even a noticable amount of current. WRONG. When shore power went out, it was enough to take the 12V house battery down to zip. And once it was down below a certain threshhold, the charger refused to bring it back up again. So.... Check to see if there's any current drain at all that you're not aware of when you think everything is "off".
2) Check your charger. Though - these days, it's harder to do since the chargers are so darn "smart". The manufacturers for trickle chargers typically won't tell you their algorithm (at least not in an obvious place) - but it seems like they sense the voltage on the battery before they start charging. If the battery gets too low, the charger is smart enough to know not to mess with it (??!!). I miss the days of chargers that just put out a current limited voltage no matter... (I'm sure THAT comment will raise some eyebrows - but at least it was a LOT SIMPLER back then to tell if the charger was good or bad...)
Good luck!
From: Mike <biankablog@verizon.net>
To: "electricboats@yahoogroups.com" <electricboats@yahoogroups.com>
Sent: Saturday, April 20, 2013 8:41 PM
Subject: Re: [Electric Boats] Battery issues
To: "electricboats@yahoogroups.com" <electricboats@yahoogroups.com>
Sent: Saturday, April 20, 2013 8:41 PM
Subject: Re: [Electric Boats] Battery issues
Sounds like the batteries are sulfating. IMO you really should consider a beefier three stage charger than a trickle charger. I'm using a Zivan NG-1 for bulk charging and sometimes a DUAL PRO 4 to top the individual AGM batteries off. My batteries are still going strong after five years. Perhaps a little more info on the batteries (type and size) and brand and specs of your charger would help the battery gurus here to give you more advice.
Capt. MIke
http://biankablog.blogspot.com
From: "magicflyer@sbcglobal.net" <potedenuni@gmail.com>
To: electricboats@yahoogroups.com
Sent: Saturday, April 20, 2013 12:29 PM
Subject: [Electric Boats] Battery issues
To: electricboats@yahoogroups.com
Sent: Saturday, April 20, 2013 12:29 PM
Subject: [Electric Boats] Battery issues
I have been experiencing battery issues. I have a 48v system (4x12 wet cell) on a fairly new trickle charger. After only a couple of months, all four batteries had to be replaced...wouldn't take or hold a charge. The new batteries have been in only about 6 weeks and already I am only able to get to 47.5v. I fear the new batteries are already shot. I have been having a problem with the shore power breaker tripping which leaves the boat with no power for several days at a time, but can't see how that would be damaging the batteries. Can anyone give me any pointers on common problems that might be damaging the cells? Thank you!
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