more battery questions - Page 2 - SailNet Community
 1Likes
Reply
 
LinkBack Thread Tools
post #11 of 22 Old 12-24-2011
Senior Member
 
Join Date: Aug 2006
Location: Arlington, VA
Posts: 1,853
Thanks: 0
Thanked 11 Times in 9 Posts
Rep Power: 10
   
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
btrayfors is offline  
Quote Quick Reply Share with Facebook
Sponsored Links
Advertisement
 
post #12 of 22 Old 12-24-2011
Senior Member
 
mitiempo's Avatar
 
Join Date: Sep 2008
Location: Victoria B.C. Canada
Posts: 7,485
Thanks: 0
Thanked 94 Times in 85 Posts
Rep Power: 8
   
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
mitiempo is offline  
Quote Quick Reply Share with Facebook
post #13 of 22 Old 12-24-2011
Senior Member
 
Join Date: Aug 2006
Location: Arlington, VA
Posts: 1,853
Thanks: 0
Thanked 11 Times in 9 Posts
Rep Power: 10
   
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
btrayfors is offline  
Quote Quick Reply Share with Facebook
post #14 of 22 Old 12-24-2011
Senior Member
 
mitiempo's Avatar
 
Join Date: Sep 2008
Location: Victoria B.C. Canada
Posts: 7,485
Thanks: 0
Thanked 94 Times in 85 Posts
Rep Power: 8
   
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
mitiempo is offline  
Quote Quick Reply Share with Facebook
post #15 of 22 Old 12-25-2011 Thread Starter
Member
 
Join Date: Oct 2009
Posts: 43
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
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
Fitz87 is offline  
Quote Quick Reply Share with Facebook
post #16 of 22 Old 12-25-2011
Senior Member
 
mitiempo's Avatar
 
Join Date: Sep 2008
Location: Victoria B.C. Canada
Posts: 7,485
Thanks: 0
Thanked 94 Times in 85 Posts
Rep Power: 8
   
Sounds like a good plan. Merry Christmas.

Brian
Living aboard in Victoria Harbour
mitiempo is offline  
Quote Quick Reply Share with Facebook
post #17 of 22 Old 12-25-2011
Senior Member
 
Stu Jackson's Avatar
 
Join Date: Jul 2001
Posts: 868
Thanks: 0
Thanked 12 Times in 11 Posts
Rep Power: 14
 
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#)
Stu Jackson is offline  
Quote Quick Reply Share with Facebook
post #18 of 22 Old 12-25-2011 Thread Starter
Member
 
Join Date: Oct 2009
Posts: 43
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
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!
Fitz87 is offline  
Quote Quick Reply Share with Facebook
post #19 of 22 Old 12-25-2011
Senior Member
 
mitiempo's Avatar
 
Join Date: Sep 2008
Location: Victoria B.C. Canada
Posts: 7,485
Thanks: 0
Thanked 94 Times in 85 Posts
Rep Power: 8
   
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
mitiempo is offline  
Quote Quick Reply Share with Facebook
post #20 of 22 Old 12-25-2011
Senior Member
 
davidpm's Avatar
 
Join Date: Oct 2007
Location: Madison
Posts: 3,953
Thanks: 235
Thanked 61 Times in 52 Posts
Rep Power: 8
 
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.
davidpm is offline  
Quote Quick Reply Share with Facebook
Reply

Quick Reply
Message:
Options

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:
OR

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
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Forum Replies Last Post
Battery Questions sundog01 Electrical Systems 1 05-18-2009 05:06 PM
Battery questions Popeyensweetp Electrical Systems 4 02-22-2009 11:23 PM
More battery theory questions hertfordnc Gear & Maintenance 1 04-22-2008 08:47 AM
Charging / Battery questions wduncan50 Gear & Maintenance 17 01-16-2008 03:51 PM
More Battery Questions.... Alden68 Gear & Maintenance 26 04-16-2007 06:44 PM

Posting Rules  
You may post new threads
You may 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 On
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome