Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 03-08-2014, 20:37   #1
Mooderator
 
capngeo's Avatar

Cruisers Forum Supporter

Join Date: Jul 2010
Location: Key West & Sarasota
Boat: Cal 28 "Happy Days"
Posts: 4,211
Images: 12
Send a message via Yahoo to capngeo Send a message via Skype™ to capngeo
CRAP! Killed the New Battery Bank

So in a classic Homer Simpson DOH! moment, I left the boat last week, and left the damned 12V fans running. Fast forward a week, I come back aboard and the house bank (4 @T-105) was flat arse dead... ZERO volts. I charged them back up and ran through a discharge cycle of ~60AH which they "seemed" to handle fine, staying over 12V. Ran a full charge cycle utill the charger stopped. I shut down every circuit but the bilge pumps, and I'll check voltage over the next few days.

What's the consensus? Should I scrap the 2 month old bank and buy new, or did I dodge the bullet?
__________________

__________________
Any fool with a big enough checkbook can BUY a boat; it takes a SPECIAL type of fool to build his own! -Capngeo
capngeo is offline   Reply With Quote
Old 03-08-2014, 20:52   #2
Registered User
 
cheoah's Avatar

Join Date: Sep 2010
Location: North Carolina, USA
Boat: Moccasins and pony
Posts: 996
Re: CRAP! Killed the New Battery Bank

I would not buy new batteries unless I saw a significant decrease in performance. Just keep using 'em, keep them topped up, filled (if applicable), and try not to fully discharge them again. They are designed to be discharged and recharged over and over, so I would not worry about it.
__________________

__________________
cheoah is offline   Reply With Quote
Old 03-08-2014, 20:52   #3
Senior Cruiser
 
DeepFrz's Avatar

Cruisers Forum Supporter

Join Date: Mar 2006
Location: Winnipeg
Boat: None at this time
Posts: 7,930
Re: CRAP! Killed the New Battery Bank

You need more time to really know. Dockhead did a similar thing a few yrs. ago and his bank is still going strong. I don't remember all the details but that was just after replacing his bank too. Can you do an equalization charge?
__________________
The Blue Dot Campaign. This Changes Everything.
DeepFrz is offline   Reply With Quote
Old 04-08-2014, 00:13   #4
Moderator Emeritus
 
Ex-Calif's Avatar

Cruisers Forum Supporter

Join Date: May 2007
Location: Singapore
Boat: Maxi 77 - Relax Lah!
Posts: 11,514
Images: 4
Re: CRAP! Killed the New Battery Bank

Relatively slow discharge rate. One time occurrence, newer batts.

You didn't do them any favors but it isn't the first time in history someone let a battery go flat...

"Party on, Garth..."
__________________
Relax Lah! is For Sale <--- Click
Click--> Custom CF Google Search or CF Rules
You're gonna need a bigger boat... - Martin Brody
Ex-Calif is offline   Reply With Quote
Old 04-08-2014, 00:16   #5
Senior Cruiser
 
Jim Cate's Avatar

Cruisers Forum Supporter

Join Date: May 2008
Location: cruising SW Pacific
Boat: Jon Sayer 1-off 46 ft fract rig sloop strip plank in W Red Cedar
Posts: 11,447
Re: CRAP! Killed the New Battery Bank

As I understand typical golf cart usage, they are frequently run flat and left for dead on the golf course... and they recover just fine. A good equalizing charge would help get them back on their feet, but just charging them to the recommended 14.8 volts will likely be enough.

Cheers,

Jim
__________________
Jim and Ann s/v Insatiable II , lying Port Cygnet, Tasmania once again
Jim Cate is online now   Reply With Quote
Old 04-08-2014, 03:33   #6
Moderator
 
noelex 77's Avatar

Cruisers Forum Supporter

Join Date: Jul 2007
Location: Living on dirt waiting for our new yacht to be built.
Boat: Half built Bestevaer.
Posts: 10,618
Re: CRAP! Killed the New Battery Bank

It will shorten their life slightly, but there is no need to think about scrapping them.

Fan power draw is quite low so hopefully they have not been flat long. An equalisation cycle would be a good idea.
__________________
noelex 77 is offline   Reply With Quote
Old 04-08-2014, 03:50   #7
Certifiable Refitter/Senior Wannbe
 
Wotname's Avatar

Cruisers Forum Supporter

Join Date: Jan 2008
Location: South of 43 S, Australia
Boat: Van DeStat Super Dogger 31'
Posts: 7,331
Re: CRAP! Killed the New Battery Bank

What all the above said... +1
__________________
All men dream: but not equally. Those who dream by night in the dusty recesses of their minds wake in the day to find it was vanity: but the dreamers of the day are dangereous men, for they may act their dreams with open eyes, to make it possible. T.E. Lawrence
Wotname is offline   Reply With Quote
Old 04-08-2014, 05:36   #8
Registered User
 
ontherocks83's Avatar

Join Date: Aug 2013
Location: Massachusetts
Boat: Checkmate Strobe 201
Posts: 1,593
Re: CRAP! Killed the New Battery Bank

You should scrap them. And as a favor to you just mail them to my house and I will gladly dispose of them for you.

I think the quality of batteries you bought is definitely on your side. Equalize, monitor, and then determine their fate.
__________________
-Si Vis Pacem Para Bellum
-Molon Labe
ontherocks83 is offline   Reply With Quote
Old 04-08-2014, 07:12   #9
Mooderator
 
capngeo's Avatar

Cruisers Forum Supporter

Join Date: Jul 2010
Location: Key West & Sarasota
Boat: Cal 28 "Happy Days"
Posts: 4,211
Images: 12
Send a message via Yahoo to capngeo Send a message via Skype™ to capngeo
Re: CRAP! Killed the New Battery Bank

Quote:
Originally Posted by ontherocks83 View Post
You should scrap them. And as a favor to you just mail them to my house and I will gladly dispose of them for you.

I think the quality of batteries you bought is definitely on your side. Equalize, monitor, and then determine their fate.
Ok, I'll send them off to you, First Class Mail.... Postal fee is $2397.99, please remit ASAP, and I'll get them on the way!

Thanks to the rest!
__________________
Any fool with a big enough checkbook can BUY a boat; it takes a SPECIAL type of fool to build his own! -Capngeo
capngeo is offline   Reply With Quote
Old 04-08-2014, 09:42   #10
Long Range Cruiser
 
MarkJ's Avatar

Cruisers Forum Supporter

Join Date: Dec 2007
Location: Australian living on "Sea Life" currently in England.
Boat: Beneteau 393 "Sea Life"
Posts: 12,828
Images: 25
Re: CRAP! Killed the New Battery Bank

Quote:
Originally Posted by Jim Cate View Post
As I understand typical golf cart usage, they are frequently run flat and left for dead on the golf course... and they recover just fine. A good equalizing charge would help get them back on their feet, but just charging them to the recommended 14.8 volts will likely be enough.

Cheers,

Jim

Hi Jim and others...

Can this be correct that they discharge the batteries till they are dead? Or do they have a thingo that stops them when they go down below some set voltage?

If there is that sort of thingo, wouldnt that be good to have for boats that are not live aboards?

Mark
__________________
Notes on a Circumnavigation.
OurLifeAtSea.com

Somalia Pirates and our Convoy
MarkJ is offline   Reply With Quote
Old 04-08-2014, 10:14   #11
Registered User

Join Date: Jun 2010
Location: Sailing the Caribbean
Boat: Switch 51
Posts: 1,498
Re: CRAP! Killed the New Battery Bank

Yes, that is part of what all the to do over lithium is all about. Low voltage cutoff should be standard stuff with the size and cost of batt banks these days.

Sent from my SCH-I545 using Cruisers Sailing Forum mobile app
__________________
SVNeko is offline   Reply With Quote
Old 04-08-2014, 11:02   #12
֍֎֍֎֍֎֍֎֍֎

Cruisers Forum Supporter

Join Date: Apr 2006
Posts: 13,033
Re: CRAP! Killed the New Battery Bank

Homer, this is what the Big Red Switch is for.

Did you not use it? Or were the fans not run through it?

Either way, there are also gizmos like the "Battery Brain" or "Battery Buddy" that can disconnect loads from a car or boat battery when the voltage hits a low set point, making sure that doesn't happen again. (Yeah, one more thing to fail.)
__________________
hellosailor is offline   Reply With Quote
Old 04-08-2014, 11:16   #13
Registered User

Join Date: Apr 2013
Location: So Cal
Boat: Catalina 30
Posts: 943
Re: CRAP! Killed the New Battery Bank

Quote:
Originally Posted by MarkJ View Post

Can this be correct that they discharge the batteries till they are dead? Or do they have a thingo that stops them when they go down below some set voltage?

Mark
The typical lead-acid golf carts have no such thingo. They just get slower and slower and slower until they just won't go anymore.

I say this not as a golf cart pro but as a cheap bastard that plays golf when the rates are twilight $$. So I've had my share of dead carts since it's the end of the day.

The thingo is a low-voltage cutoff, necessary for lithiums, probably not needed for lead acid.

I've personally done the same to the boat batts, and my motorhome batts (2 times in the motorhome). GC2's from costco -- They all came back fine and haven't seen any reduction in capacity. Motorhome batts going on 6 or so years old and used regularly - so party on Wayne...
__________________
jeepbluetj is offline   Reply With Quote
Old 04-08-2014, 11:17   #14
smj
Registered User

Join Date: Nov 2007
Boat: Searunner 38 catamaran
Posts: 3,654
Re: CRAP! Killed the New Battery Bank

Quote:
Originally Posted by Jim Cate View Post
As I understand typical golf cart usage, they are frequently run flat and left for dead on the golf course... and they recover just fine. A good equalizing charge would help get them back on their feet, but just charging them to the recommended 14.8 volts will likely be enough.

Cheers,

Jim
This is absolutely correct. I don't think you did them any harm at all.
__________________
smj is offline   Reply With Quote
Old 04-08-2014, 11:53   #15
cruiser

Join Date: Feb 2013
Location: Dutchman, somewhere North East Brazil
Boat: Boat less at the moment.
Posts: 73
Re: CRAP! Killed the New Battery Bank

Quote:
Originally Posted by MarkJ View Post
Hi Jim and others...

Can this be correct that they discharge the batteries till they are dead? Or do they have a thingo that stops them when they go down below some set voltage?

If there is that sort of thingo, wouldnt that be good to have for boats that are not live aboards?

Mark
Can. I killed my 3 month old 12 x 2 Volt Cells by letting run my Webasto for 3 weeks. I was not able to rescue them.....
__________________

__________________
Reiziger is offline   Reply With Quote
Reply

Tags
battery

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Old Bank - New Bank belizesailor Electrical: Batteries, Generators & Solar 0 21-08-2012 13:07
Whats with this crap. mudnut Off Topic Forum 5 29-12-2006 13:32



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 17:35.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.