Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 10-05-2016, 06:56   #1
Registered User
 
Jm2fly's Avatar

Join Date: Apr 2016
Location: Minneapolis
Boat: C & C 33
Posts: 39
Battery for Atomic 4

Our sea trial is this Saturday and the battery is probably a goner. What size cch should I get for a battery for this thing?


Sent from my iPhone using Cruisers Sailing Forum
__________________

__________________
Jm2fly is offline   Reply With Quote
Old 10-05-2016, 06:57   #2
Registered User
 
Jm2fly's Avatar

Join Date: Apr 2016
Location: Minneapolis
Boat: C & C 33
Posts: 39
Re: Battery for Atomic 4

It's a C &C 33 for reference.


Sent from my iPhone using Cruisers Sailing Forum
__________________

__________________
Jm2fly is offline   Reply With Quote
Old 10-05-2016, 07:29   #3
Registered User

Join Date: Feb 2016
Location: Great Lakes
Boat: Mid size sloop rigged
Posts: 182
Re: Battery for Atomic 4

My last boat had an atomic 4, I just had a small battery I believe it was a 675 MCA. She spun up fine with that.
__________________
Ungvar is offline   Reply With Quote
Old 10-05-2016, 08:11   #4
Moderator
 
a64pilot's Avatar

Cruisers Forum Supporter

Join Date: Oct 2013
Location: Albany Ga.
Boat: Island Packet 38
Posts: 17,037
Re: Battery for Atomic 4

Sea trial? Have the owner supply a battery, if your going to buy, go to Walmart and buy the biggest battery that will fit, you won't need that extra battery until one day when you inadvertently discharged it, and being that it was way bigger than it needed to be, it will still start the motor.

I know, Walmart is't the best batteries there are, but for a starting battery you don't need the best battery available.
__________________
a64pilot is offline   Reply With Quote
Old 10-05-2016, 08:20   #5
Registered User

Join Date: Sep 2012
Location: Wilbur By The Sea, FL
Boat: Catalina 30
Posts: 660
Re: Battery for Atomic 4

A lot of folks use a pretty small battery. Myself, bigger is better as it is the same cell the bilge pump is directly wired to. I leave all my batteries ganged when I am off the boat just in case it springs a leak.
__________________
Gary
http://svknotaclew.wordpress.com/
The Garbone is offline   Reply With Quote
Old 10-05-2016, 08:39   #6
Registered User
 
S/V Alchemy's Avatar

Join Date: May 2008
Location: Toronto
Boat: Custom 41' Steel Pilothouse Cutter
Posts: 4,575
Re: Battery for Atomic 4

You could make do with a single Group 24, but most 33 footers would have a pair of Group 27s.

The battery's size for a sea trial is irrelevent, really, compared to its state of charge. A fully charged car battery can start a car dozens of times before draining to 50% SOC; and the starter on an Atomic 4 is not as demanding a draw. Make sure all the terminals are clean and the wire runs are big enough and are non-corroded. Too many A4s have auto-grade/welder's cables, which can go green and get hot if exposed to marine conditions.
__________________
Can't sleep? Read www.alchemy2009.blogspot.com for fast relief. Can't read? Avoid www.volumesofsalt.blogspot.com, because it's just personal reviews of sea books.
S/V Alchemy is offline   Reply With Quote
Old 10-05-2016, 09:19   #7
Marine Service Provider

Join Date: Sep 2011
Location: California
Boat: Alerion Express 38 Yawl
Posts: 269
Re: Battery for Atomic 4

There are two approaches to this question. One is the your engine requires very little starting current (low compression gas engine), so you don't NEED anything but a Group 24 starting battery. However, a C&C 33 should have a couple of quality batteries, so I would push the current owner into buying a pair of Group 27 deep cycle batteries, probably from West Marine since they are made by East Penn, and East Penn makes damned good batteries.

Don't worry about getting deep cycle batteries. They will crank your engine just fine, and be better for all other uses.

Chuck
__________________
Chuck Hawley is offline   Reply With Quote
Old 10-05-2016, 11:25   #8
Registered User

Join Date: Jul 2013
Posts: 39
Re: Battery for Atomic 4

buy a jump pack and it will be useful if the deal falls through. I would be leery of buying a boat from someone who will let all the batteries run down and not keep one good one for the bilge pump
mike
__________________
mkriley is online now   Reply With Quote
Old 10-05-2016, 11:29   #9
Registered User

Join Date: Feb 2016
Location: Great Lakes
Boat: Mid size sloop rigged
Posts: 182
Re: Battery for Atomic 4

Just a thought, but if it is literally just for a short sea trial for now, maybe you could just use your car battery, or a battery out of your tractor or whatever.
__________________
Ungvar is offline   Reply With Quote
Old 10-05-2016, 12:36   #10
Registered User
 
hamburking's Avatar

Join Date: Feb 2013
Location: Kingston Ont Canada
Boat: Looking for my next boat!
Posts: 2,148
Re: Battery for Atomic 4

For engine starting, a single group 24 starting battery (not deep cycle) is very common, and would work well. That's what I used on both my atomic 4 engines. These sell for under $100 here in canada, and you can lift/move them without breaking your back.

You should have a separate bank of batteries for running "house" loads.
__________________
hamburking is offline   Reply With Quote
Old 10-05-2016, 12:52   #11
Registered User

Join Date: Apr 2013
Location: So Cal
Boat: Catalina 30
Posts: 943
Re: Battery for Atomic 4

What they all said. I can easily start the A4 with a G24 battery. If it's your $$$$ you'll need to look at the entire battery situation - i.e. Are there 2 banks? How are they wired? etc...

I have a pair of GC6's for my main bank (used for house and starting) and a G24 as my emergency battery - it's never used.
__________________

__________________
jeepbluetj 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
Atomic 4 question shellback Engines and Propulsion Systems 4 31-03-2007 10:17
Batteries recharging from an Atomic 4 shellback Electrical: Batteries, Generators & Solar 3 20-11-2006 11:48
Atomic 4 issue DaveK Engines and Propulsion Systems 23 03-09-2006 13:22
Lifespan of an Atomic 4 Jim H Engines and Propulsion Systems 19 07-01-2006 11:16
Atomic 4 GordMay Engines and Propulsion Systems 1 21-10-2005 07:19



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 22:30.


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.