more battery questions - Page 2 - SailNet Community

   Search Sailnet:

 forums  store  


Quick Menu
Forums           
Articles          
Galleries        
Boat Reviews  
Classifieds     
Search SailNet 
Boat Search (new)

Shop the
SailNet Store
Anchor Locker
Boatbuilding & Repair
Charts
Clothing
Electrical
Electronics
Engine
Hatches and Portlights
Interior And Galley
Maintenance
Marine Electronics
Navigation
Other Items
Plumbing and Pumps
Rigging
Safety
Sailing Hardware
Trailer & Watersports
Clearance Items

Advertise Here






Go Back   SailNet Community > On Board > Gear & Maintenance > Electrical Systems
 Not a Member? 


Like Tree1Likes
Reply
 
LinkBack Thread Tools
  #11  
Old 12-24-2011
Senior Member
 
Join Date: Aug 2006
Location: Arlington, VA
Posts: 1,813
Thanks: 0
Thanked 4 Times in 4 Posts
Rep Power: 10
btrayfors will become famous soon enough btrayfors will become famous soon enough
Quote:
Originally Posted by mitiempo View Post
Bill

With a 1/2/both switch each bank can be a house bank so I believe both should be fused.
Brian,

Definitely. But the start circuit fuse needs to be larger than a house fuse in order to avoid nuisance blows when starting the engine. On a small diesel, I believe 300-400A is appropriate.

And, if you're going to regularly start the engine using the BOTH position (i.e., from the house battery bank), then you'll also need a large 300-400A fuse in that circuit.

Cheers,

Bill
Reply With Quote Quick reply to this message Share with Facebook
  #12  
Old 12-24-2011
mitiempo's Avatar
Senior Member
 
Join Date: Sep 2008
Location: Victoria B.C. Canada
Posts: 7,286
Thanks: 0
Thanked 79 Times in 70 Posts
Rep Power: 8
mitiempo will become famous soon enough mitiempo will become famous soon enough
I would try not to fuse above the wire's ampacity, although up to 150% of that is ok. ANL fuses are unique in blow point though. 2/0 as an example is good for about 280 in engine spaces. A 275 amp ANL has a blow point of 420 amps after 500 seconds and much more for shorter periods of time. That should not have nuisance blows. I haven't had any issues with nuisance blows fusing starting circuits.

I would never start from the BOTH position. If one battery can't start the engine switch to the other - especially with AGM batteries.
__________________
Brian
Living aboard in Victoria Harbour
Reply With Quote Quick reply to this message Share with Facebook
  #13  
Old 12-24-2011
Senior Member
 
Join Date: Aug 2006
Location: Arlington, VA
Posts: 1,813
Thanks: 0
Thanked 4 Times in 4 Posts
Rep Power: 10
btrayfors will become famous soon enough btrayfors will become famous soon enough
Brian,

Yes, I know about the ANL fusing delays and ratings. Still, I'd go with a larger one, since I have personally blown a 150A or 250A ANL on my 4-108....can't remember which. No problems since I've started using a 400A ANL over 5 years ago, and my wiring is 2/0.

Look at Maine's circuit diagram. If you're going to use the house batteries for starting, you HAVE to use the BOTH postion (and leave the ON-OFF switch OFF, isolating the start battery).

Bill
Reply With Quote Quick reply to this message Share with Facebook
  #14  
Old 12-24-2011
mitiempo's Avatar
Senior Member
 
Join Date: Sep 2008
Location: Victoria B.C. Canada
Posts: 7,286
Thanks: 0
Thanked 79 Times in 70 Posts
Rep Power: 8
mitiempo will become famous soon enough mitiempo will become famous soon enough
If you use the extra switch Maine suggested you are correct - I just use the 1/2/both switch and skip the extra switch.

400 amps is less than 150% of 2/0 wire's ampacity if it works for you.
__________________
Brian
Living aboard in Victoria Harbour
Reply With Quote Quick reply to this message Share with Facebook
  #15  
Old 12-25-2011
Member
 
Join Date: Oct 2009
Posts: 43
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
Fitz87 is on a distinguished road
Thanks Bill, Brian, Maine, everyone, and Merry Christmas. It sounds like the Echocharge is a better fit for what I want to do. I'll also pick up another battery switch to use for the starting circuit as drawn by Maine.

The 2 existing batteries will be wired in parallel to make the house bank and I'll get a new starting battery. I'm going to try and sneak out there later today and take some pictures and measure things. As I get closer to a final layout I'll try to post a drawing.

Thanks again

Fitz
Reply With Quote Quick reply to this message Share with Facebook
  #16  
Old 12-25-2011
mitiempo's Avatar
Senior Member
 
Join Date: Sep 2008
Location: Victoria B.C. Canada
Posts: 7,286
Thanks: 0
Thanked 79 Times in 70 Posts
Rep Power: 8
mitiempo will become famous soon enough mitiempo will become famous soon enough
Sounds like a good plan. Merry Christmas.
__________________
Brian
Living aboard in Victoria Harbour
Reply With Quote Quick reply to this message Share with Facebook
  #17  
Old 12-25-2011
Stu Jackson's Avatar
Senior Member
 
Join Date: Jul 2001
Posts: 812
Thanks: 0
Thanked 9 Times in 8 Posts
Rep Power: 14
Stu Jackson is on a distinguished road
Here's a reference that supports what Bill, Brian and Maine Sail have been saying (I just put it all in one place ):

Basic Battery Wiring Diagrams
__________________
Stu Jackson, C34, 1986, M25 engine, Rocna 10 (22#)
Reply With Quote Quick reply to this message Share with Facebook
  #18  
Old 12-25-2011
Member
 
Join Date: Oct 2009
Posts: 43
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
Fitz87 is on a distinguished road
Thanks Stu. That's a great link. I'm going with option 2 and the Echocharge.

I did get some pictures today and have some research to do now on the existing alternator (Motorola?) and regulator (spa creek?) to try and figure out what kind of output it has.

My shore charger is a Xantrex "Truecharge 10 amp TB". It looks almost new and has 8AWG wires going to the house bank location.

I'll use 2/0 for all the high current/starting runs and ANL fuses as suggested.

Thanks for all the help everyone. It's going to be a lot of expensive wire, (and lugs, and fuses, and busses, and switches...) but like most of these projects, in the end, I'll have learned some things I didn't know I didn't know!
Reply With Quote Quick reply to this message Share with Facebook
  #19  
Old 12-25-2011
mitiempo's Avatar
Senior Member
 
Join Date: Sep 2008
Location: Victoria B.C. Canada
Posts: 7,286
Thanks: 0
Thanked 79 Times in 70 Posts
Rep Power: 8
mitiempo will become famous soon enough mitiempo will become famous soon enough
The best place to buy wire, cables, and lugs is Genuinedealz > Marine Wire, Boat Wire, Boat Cable, Marine Grade

If you don't have the proper crimp tool they will install lugs on the 2/0 for $1 labor each. The only disadvantage is that you have to measure the proper lengths when ordering.
__________________
Brian
Living aboard in Victoria Harbour
Reply With Quote Quick reply to this message Share with Facebook
  #20  
Old 12-26-2011
davidpm's Avatar
Senior Member
 
Join Date: Oct 2007
Location: Madison
Posts: 3,818
Thanks: 206
Thanked 50 Times in 42 Posts
Rep Power: 8
davidpm is on a distinguished road
Quote:
Originally Posted by Fitz87 View Post
Thanks Stu. That's a great link. I'm going with option 2 and the Echocharge.

I did get some pictures today and have some research to do now on the existing alternator (Motorola?)

Thanks for all the help everyone. It's going to be a lot of expensive wire, (and lugs, and fuses, and busses, and switches...) but like most of these projects, in the end, I'll have learned some things I didn't know I didn't know!
curious as to your current cost estimate.
Reply With Quote Quick reply to this message Share with Facebook
Reply

Quick Reply
Message:
Options

By choosing to post the reply above you agree to the rules you agreed to when joining Sailnet.
Click Here to view those rules.

Register Now

In order to be able to post messages on the SailNet Community forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
Please note: After entering 3 characters a list of Usernames already in use will appear and the list will disappear once a valid Username is entered.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

 
Posting Rules
You may post new threads
You may post replies
You may post attachments
You may edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Battery Questions sundog01 Electrical Systems 1 05-18-2009 06:06 PM
Battery questions Popeyensweetp Electrical Systems 4 02-23-2009 12:23 AM
More battery theory questions hertfordnc Gear & Maintenance 1 04-22-2008 09:47 AM
Charging / Battery questions wduncan50 Gear & Maintenance 17 01-16-2008 04:51 PM
More Battery Questions.... Alden68 Gear & Maintenance 26 04-16-2007 07:44 PM


All times are GMT -4. The time now is 12:59 AM.

Add to My Yahoo!         
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
SEO by vBSEO 3.6.1
(c) Marine.com LLC 2000-2012

The SailNet.com store is owned and operated by a company independent of the SailNet.com forum. You are now leaving the SailNet forum. Click OK to continue or Cancel to return to the SailNet forum.