SailNet Community - Reply to Topic
Thread: Busbar sizing Reply to Thread
Send Trackbacks to (Separate multiple URLs with spaces) :
Post Icons
You may choose an icon for your message from the following list:

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:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


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.

  Additional Options
Miscellaneous Options

Click here to view the posting rules you are bound to when clicking the
'Submit Reply' button below

  Topic Review (Newest First)
09-02-2012 12:27 AM
Re: Busbar sizing

Originally Posted by mitiempo View Post
Actually 1/0 is rated for 285 amps outside engine spaces and 242 amps inside engine spaces.
Yes, you are right I should have been using the free air rating.
09-01-2012 11:31 AM
Re: Busbar sizing

Originally Posted by ebs001 View Post
...The rating of 1/0 wire is 150amps.
Actually 1/0 is rated for 285 amps outside engine spaces and 242 amps inside engine spaces.
08-31-2012 10:33 AM
Re: Busbar sizing

Thank you ebs001. I must be a nerd because I've really been waffling on this. Right now my plan is to use the 250amp because it is, as I've discovered, similar in size to the Victron shunt. They are both basically too large to cover effectively in my battery box so i think I'll leave them without covers and focus on covering all the positive studs and terminals. I was also surprised that the shunt terminals are 3/8" versus 5/16" requiring jumper cables with different sized lugs so fyi for anyone planning to install a Victron battery monitor.
08-31-2012 07:30 AM
Re: Busbar sizing

Bussbar ratings are for continuous loads. Motor's peaks are momentary at start up, although you can put considerably higher load on the windlass circuit when approaching its maximum weight rating, like with an anchor stuck on the bottom, but that current draw will be of short duration as well. The rating of 1/0 wire is 150amps.
08-28-2012 04:45 PM
Busbar sizing

Hi all - I've learned so much on this forum. Thank you all for your great contributions and dialogue.

I am installing a Victron battery monitor and am debating between the Blue Sea 250 amp Maxibus and the 150 amp version to consolidate the ground wires in front of the shunt. The 250 amp with cover is LARGE and I'm not sure I can fit it very effectively in my battery compartment.

My static loads will never exceed 150amps (no inverter or heavy loads) so I'm only wondering about the starter motor and electric windlass. I suppose that, if I somehow managed to crank the engine and haul in an anchor at the same time that the peak current could well exceed 150 amps. But I can't imagine the two loads being concurrently applied for more than 60 seconds. Even that is a stretch I believe.

Seem to me that the 150 amp bus bar (BLU-2307) with cover should be plenty. But then again I have been going to the trouble of using 1/0 wiring in the battery box for jumpers between my new 6vs wired in series.

Any words of wisdom?


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

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