Best way to connect all charging sources to the house bank without making spaghetti? - Page 4 - 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? 
  #31  
Old 09-13-2011
smurphny's Avatar
Over Hill Sailing Club
 
Join Date: Feb 2009
Location: Adirondacks NY
Posts: 2,689
Thanks: 49
Thanked 56 Times in 54 Posts
Rep Power: 6
smurphny is on a distinguished road
This is really interesting...and a bit distressing because the amp ratings on these things seem to be largely meaningless. Why not call a 300 amp fuse a 300 amp fuse???? It seems a little silly (and dangerous) to call a fuse that will NEVER blow before 440 amps a 300 amp fuse. I have always ass-u-med that these physical fuses, in contrast to a circuit breaker, would be MORE accurate when matching wire sizes to circuit protection. It's like saying it's ok to put a 30a fuse on a #12 wire in your house--not a good idea.

The starter on my Yanmar 3GM30F has a current rating (from service manual) of "460a. or less" under a load, although looking at the torque curve, it appears that above 8v. it would never draw>350a. Even a 400a fuse would be cutting it close which is why I have a 500a ANL in place at present which will , in actuality only help for a dead short. Now...if a 500 amp fuse is ACTUALLY a 600 amp fuse, maybe I can knock it down to 400 amps (or even 275 if the chart is accurate), still well above 2/0 wire ratings but a bit less likely to melt off insulation in a partial short.

This is all a good reason to use additional conduit (as I mentioned above) to protect starter wires. If these things weren't so expensive, I'd like to experiment with them to get some real results.

Last edited by smurphny; 09-13-2011 at 01:22 AM.
Reply With Quote Share with Facebook
  #32  
Old 09-13-2011
mitiempo's Avatar
Senior Member
 
Join Date: Sep 2008
Location: Victoria B.C. Canada
Posts: 7,013
Thanks: 0
Thanked 64 Times in 55 Posts
Rep Power: 7
mitiempo will become famous soon enough mitiempo will become famous soon enough
With starter wiring you are really fusing for short circuit protection - and in that case the fuse will blow. I don't think overload is an issue as the starter is only used for 5 or 10 seconds at a time. The same really goes for main battery fusing as well.

Like Maine I have blown an ANL fuse by mistake. Did just what it was supposed to do.

From Blue Seas:
Attached Thumbnails
Best way to connect all charging sources to the house bank without making spaghetti?-1.jpg  
__________________
Brian
Living aboard in Victoria Harbour
Reply With Quote Share with Facebook
  #33  
Old 09-13-2011
smurphny's Avatar
Over Hill Sailing Club
 
Join Date: Feb 2009
Location: Adirondacks NY
Posts: 2,689
Thanks: 49
Thanked 56 Times in 54 Posts
Rep Power: 6
smurphny is on a distinguished road
Quote:
Originally Posted by mitiempo View Post
With starter wiring you are really fusing for short circuit protection - and in that case the fuse will blow. I don't think overload is an issue as the starter is only used for 5 or 10 seconds at a time. The same really goes for main battery fusing as well.

Like Maine I have blown an ANL fuse by mistake. Did just what it was supposed to do.

From Blue Seas:
My sentiments exactly. That's why I have the starter fuse well over sized: In case I drop a wrench across or something breaks and spans across + to -. Pretty much any fuse will blow in those situations if physically smaller than the wire.
Reply With Quote Share with Facebook
Reply

Tags
charging system , house bank , wiring


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
House bank and things. deniseO30 Electrical Systems 29 03-28-2011 12:40 AM
Adding a third Battery to House Bank montenido Electrical Systems 2 06-21-2010 12:17 AM
Battery charging from multiple sources DaveEv Gear & Maintenance 5 05-05-2008 07:44 PM
Multiple Charging Sources kaakre Gear & Maintenance 5 02-21-2007 05:55 PM
Multiple Sources for Battery Charging Tom Wood Gear and Maintenance Articles 0 12-07-2001 07:00 PM


All times are GMT -4. The time now is 10:02 PM.

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.