Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 12-10-2012, 09:39   #1
Registered User

Join Date: Sep 2012
Posts: 22
Deep Cycle Batteries

Recently purchased a C&C 35 mk2 which had a single house battery. My question is how long do deep cycle batteries last and what effect does the battery being undercharged have on it? The previous owner doesn"t remember when it was purchased so it could be 6 to 8 years old.
__________________

__________________
Gulf Islander is offline   Reply With Quote
Old 12-10-2012, 09:44   #2
Registered User
 
Target9000's Avatar

Join Date: May 2009
Location: New Orleans LA
Boat: 74 Westsail 32
Posts: 1,379
Re: Deep Cycle Batteries

Many many factors contribute to a batteries longevity. If it is a flooded lead acid deep cycle battery that is kept full of electrolyte and isn't abused >too< badly, you can expect five years.

If you drain it down to near dead too often or chronically overcharge/undercharge it, or if you keep put it in extreme temperatures you may reduce its life.
__________________

__________________
Let your heart tell you where to go, but let your brain tell you how to get there.

Sundowner Sails Again
Target9000 is offline   Reply With Quote
Old 12-10-2012, 09:46   #3
Registered User
 
jeremiason's Avatar

Join Date: Oct 2010
Location: Punta Gorda, Florida
Boat: Sea Ray 270
Posts: 1,427
Images: 2
Send a message via ICQ to jeremiason Send a message via Yahoo to jeremiason Send a message via Skype™ to jeremiason
Re: Deep Cycle Batteries

Do a voltage and hydrometer test on it...

Battery life depends on lots of things, including owner maintenance, which judging by his lack of knowledge suggest he probably didn't do a great job.

On side note you didn't say what size the house battery was, but a 1970's boat did not have and was not designed for todays electrical requirements.

You should think about expanding the house bank...
__________________
Tom Jeremiason
Punta Gorda, Florida

jeremiason is offline   Reply With Quote
Old 12-10-2012, 10:24   #4
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: 10,619
Re: Deep Cycle Batteries

Welcome to the forum Gulf Islander.

As others have said 5 years is a typical life for a cheapish flooded battery, but it is very variable. I got 16 years out of one house bank.
You can do a load test on the battery (a forum search will show a few posts on this) which will tell you the capacity, but the test is hard on the battery, so many people simply wait until it fails.
__________________
noelex 77 is offline   Reply With Quote
Old 12-10-2012, 10:46   #5
Senior Cruiser
 
Cheechako's Avatar

Cruisers Forum Supporter

Join Date: Aug 2006
Location: Skagit City, WA
Posts: 19,363
Re: Deep Cycle Batteries

Generally 5-6 years life. Well cared for could be more. If they sit too long unused they go bad. Charge it fully ,, disconnect everything and measure the votage the next day. If it doesnt stay fully charged it's probably garbage....

Speaking of which, has anyone noticed the price of batteries??? I need to put one in my van. Seems like the last Costco car battery I bought (differetn car) was like $60+. Now a battery is running about $100... even at Wal Mart! Must be the trucking cost....
__________________
"I spent most of my money on Booze, Broads and Boats. The rest I wasted" - Elmore Leonard











Cheechako is offline   Reply With Quote
Old 12-10-2012, 10:59   #6
Registered User

Join Date: Oct 2012
Location: In the hills south of Nelson, NZ
Posts: 82
Re: Deep Cycle Batteries

Nope, lead cost increase is probably more than trucking cost. Same problem with bullets for reloading, the US Armed Forces pushed up the prices in a major way over the past decade and it's still climbing.

At current rates Afghanistan will have a mining boom in lead and copper when the US pulls out!
__________________
Kiwi303 is offline   Reply With Quote
Old 12-10-2012, 11:08   #7
Registered User

Join Date: Sep 2012
Posts: 22
Re: Deep Cycle Batteries

Thank for the input. Since buying the boat I have added 2 115 ah batteries to the house bank. I'm not sure if the old battery is having a negative effect to the bank but I guest my best course of action would be to just replace it so that I'm using 3 new batteries.
__________________
Gulf Islander is offline   Reply With Quote
Old 12-10-2012, 11:11   #8
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: 10,619
Re: Deep Cycle Batteries

Yes, get rid of it. Don't mix new batteries with one that is 6 years old on the same bank.
__________________
noelex 77 is offline   Reply With Quote
Old 12-10-2012, 11:14   #9
Registered User

Join Date: Oct 2012
Location: In the hills south of Nelson, NZ
Posts: 82
Re: Deep Cycle Batteries

A bad battery that loses charge can suck current from good batteries, killing them as well.

Hence not mixing batteries.
__________________
Kiwi303 is offline   Reply With Quote
Old 14-10-2012, 10:53   #10
Registered User
 
Sonosailor's Avatar

Join Date: Mar 2003
Location: Fredericton, NB, Canada in the summer and fall; Caribbean in winter and spring aboard Cat Tales.
Boat: FP Tobago 35 (and a H-21 SE)
Posts: 547
Images: 8
Re: Deep Cycle Batteries

Surely, somewhere on this site is more information on battery life, but here's the basics for longest life.
1. Size the bank, charging systems and usage so that the batteries never drop below 50% of storage;
2. Monitor the batteries to learn how often they need to be topped up with distilled water;
3. Don't overcharge, undercharge, allow dirt to gather on or around batteries;
4. Equalize the batteries in a manner approved by the battery manufacturer whenever there is a difference of 0.030 Specific Gravity between cells, or around 6 months. Trojan has good info on equalizing batteries on their site.

Again, I'm sure this site has better info, and a longer list.
__________________
Sonosailor is offline   Reply With Quote
Old 14-10-2012, 12:21   #11
Registered User
 
Stu Jackson's Avatar

Join Date: Jan 2011
Location: Cowichan Bay, BC (Maple Bay Marina)
Posts: 6,387
Re: Deep Cycle Batteries

One of the most helpful tutorials ever:

Technical Documents, Manuals, App Notes

Use the Tech tab to download the Ample Power Primer and associated wiring diagrams.
__________________
Stu Jackson
Catalina 34 #224 (1986) C34IA Secretary
Cowichan Bay, BC, (Maple Bay Marina) SR/FK, M25, Rocna 10 (22#) (NZ model)
Stu Jackson is online now   Reply With Quote
Old 14-10-2012, 12:34   #12
Senior Cruiser
 
rebel heart's Avatar

Cruisers Forum Supporter

Join Date: Oct 2005
Posts: 6,190
Images: 3
Re: Deep Cycle Batteries

Quote:
Originally Posted by Cheechako View Post
Speaking of which, has anyone noticed the price of batteries??? I need to put one in my van. Seems like the last Costco car battery I bought (differetn car) was like $60+. Now a battery is running about $100... even at Wal Mart! Must be the trucking cost....
I was thinking of swapping out my T105's that are about two years old before we leave the country until I saw them for about $200 a piece. I'll try to get four more years out of them instead.
__________________

__________________
rebel heart is offline   Reply With Quote
Reply

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




Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 10:03.


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.