Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 19-04-2015, 21:15   #1
Registered User

Join Date: Mar 2015
Posts: 5
pirate Stupid Question?

Maybe a stupid question...
I need to put new batteries in my boat, a 1966 Islander 33. Must I use 12V that are specifically designed for marine applications? I have a friend who can provide me with an endless supply of SUV/RV batteries for free. Is it worth it to even consider this?

Thanks!
__________________

__________________
Chef David is offline   Reply With Quote
Old 19-04-2015, 21:31   #2
Registered User
 
Island Time O25's Avatar

Join Date: Sep 2014
Posts: 2,019
Re: Stupid Question?

For a house bank you can do 6v golf batteries installed in a series to get 12v if you can get them cheaply enough.

The "marine" moniker on a starting battery is often a negative as it signifies a battery which is often not spec'd for very cold temps. After all how often do you get a -20F or colder ambient air temp on a boat which is on the water? But most car batteries are made to handle wide range of temps including extremely cold temps.
__________________

__________________
Island Time O25 is offline   Reply With Quote
Old 19-04-2015, 21:33   #3
Senior Cruiser
 
skipmac's Avatar

Cruisers Forum Supporter

Join Date: Oct 2007
Location: 29 49.16 N 82 25.82 W
Boat: Pearson 422
Posts: 12,374
Re: Stupid Question?

As far as I know, there is no special battery made just for SUVs or RVs. They use the same batteries made for cars, trucks, boats, etc.

For an SUV or a boat to run lights and such what you need is called a deep cycle battery. This type of battery can be discharged more deeply without damage than a standard auto cranking battery.

If you need a battery for starting the engine you will do better to use a regular starting battery.

However if you can get these batteries for free then how can you go wrong? Even if it is a starting battery it will work fine for running boat lights and such. Probably won't last as long as a deep cycle battery but for free who cares if you get 4 years instead of 6.
__________________
The water is always bluer on the other side of the ocean.
skipmac is online now   Reply With Quote
Old 19-04-2015, 21:34   #4
Senior Cruiser
 
DeepFrz's Avatar

Cruisers Forum Supporter

Join Date: Mar 2006
Location: Winnipeg
Boat: None at this time
Posts: 7,930
Re: Stupid Question?

Golf cart batteries are probably the most cost effective. Marine batteries are usually not true deep cycle batteries. Only use a start battery for the engine start or windlass. Your house batteries should be deep cycle.
__________________
DeepFrz is offline   Reply With Quote
Old 19-04-2015, 21:47   #5
Registered User

Join Date: Mar 2015
Posts: 5
Re: Stupid Question?

Thanks all...appreciate the advice.
__________________
Chef David is offline   Reply With Quote
Old 19-04-2015, 22:06   #6
Registered User
 
NorthernSeaWolf's Avatar

Join Date: Jun 2014
Location: From Coastal BC, currently stuck in a corn field in Godforesaken, IN
Posts: 107
Re: Stupid Question?

You know what I love about Cruiser Forums? Everyone contributes information that my brain-housing group had yet to question!

Note to self...

Thanks!
__________________
NorthernSeaWolf is offline   Reply With Quote
Old 19-04-2015, 22:12   #7
Registered User
 
CrustyChief's Avatar

Join Date: Apr 2015
Location: Las Vegas Nv./ Portland
Boat: Selene 47
Posts: 75
Re: Stupid Question?

Just a recommendation, Nigel Calders "mechanical and electrical manual" it's one of those books everyone should have.
__________________

__________________
CrustyChief 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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Stupid Is as Stupid Does smcauley440 The Sailor's Confessional 13 18-03-2011 03:52
Stupid, Stupid Laws Factor Rules of the Road, Regulations & Red Tape 24 28-04-2010 21:51
A REALLY Stupid Thing Done While Doing a Stupid Thing Dick Pluta The Sailor's Confessional 31 28-04-2010 19:00



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 21:24.


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.