Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 20-02-2009, 19:23   #1
Registered User
 
Extemporaneous's Avatar

Join Date: Dec 2007
Location: Canada
Boat: Corbin 39 Special Edition
Posts: 909
Resistance per connection

SmartGauge Electronics - How to wire alternators up - properly

Have any of you Electrical Guys read this, and do you subscribe to all that it says?
If only some of it, which point do you disagree with?

Let me know what you think.

Thanks,
Extemp.
__________________

__________________
Extemporaneous is offline   Reply With Quote
Old 20-02-2009, 20:00   #2
Registered User
 
richardhula's Avatar

Join Date: Nov 2008
Location: UK
Boat: S M Hudson 60' narrowboat
Posts: 347
Send a message via Skype™ to richardhula
The theory is good, but in practice I would rather have a short adequately sized cable going from the alternator to the starter connection and relying on the very thick battery cable and high current connections thereafter.

The volt drop you are trying to avoid is likely to be greater with a long cable run of lesser gauge direct from alternator to wherever.

I would suggest that with the split charge system that many boats will have, feeding starter and house batteries, the splitter should be located close to the alternator. Keep cable runs as short as possible with a heavier gauge cable run to the house bank, and the starter battery feed run to the positive battery connection on the starter motor as mentioned already.

Regards
__________________

__________________
Richard

If in doubt RTFM
richardhula is offline   Reply With Quote
Old 20-02-2009, 20:10   #3
Senior Cruiser
 
DeepFrz's Avatar

Cruisers Forum Supporter

Join Date: Mar 2006
Location: Winnipeg
Boat: None at this time
Posts: 7,930
Extemp, the article has it right (IMHO). Run the cable from the alternator to the house bank, connect the house bank to the start battery with a device like the "Echo charger". Of course you need properly sized cables from the alternator to the house bank. The article explains why to do it this way pretty well.
__________________
The Blue Dot Campaign. This Changes Everything.
DeepFrz is offline   Reply With Quote
Old 20-02-2009, 20:20   #4
Registered User
 
Celestialsailor's Avatar

Join Date: Nov 2006
Location: In Mexico, working on the boat
Boat: Hallberg Rassy 35. and 14ft.Whitehall pulling skiff.
Posts: 8,013
Images: 5
Why not just run a hefty size cable from the Alt. to the common side of the battery selector switch. Also, use a "Zap stop" diode so the Alt. does not get fried when the switch is turned off accidentally while the engine is running.
__________________
"Life is not a journey to the grave with the intention of arriving safely in a pretty and well-preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming: Wow - what a ride!"

http://wwwjolielle.blogspot.com/
Celestialsailor is offline   Reply With Quote
Old 20-02-2009, 20:33   #5
Moderator Emeritus
 
David M's Avatar

Cruisers Forum Supporter

Join Date: Sep 2007
Location: San Francisco Bay
Boat: research vessel
Posts: 10,153
I think its a solution looking for a non-existent problem. There are benefits to keeping things simple. The more gizmos you have, the more likely one is to break putting you out of business.

Gauge your wires properly and keep your terminals tight and clean and you wont need to worry about it.
__________________
David

Life begins where land ends.
David M is offline   Reply With Quote
Old 20-02-2009, 21:13   #6
Registered User
 
Extemporaneous's Avatar

Join Date: Dec 2007
Location: Canada
Boat: Corbin 39 Special Edition
Posts: 909
Resistance per connection

Very shortly I will be purchasing my House battery bank (800 to 1000 amp hrs). To date I've been thinking of getting Trojan 27-AGM Marine/RV AGM Dual Purpose Batteries. Their 20hr rating is 100 AH. This would mean 8 or 10 batteries. Hence the concern about resistance per connection.
I could go with larger batteries, but I've read some good things about the Trojan 27-AGM.

Extemp.
__________________
Extemporaneous is offline   Reply With Quote
Old 20-02-2009, 21:57   #7
Senior Cruiser
 
DeepFrz's Avatar

Cruisers Forum Supporter

Join Date: Mar 2006
Location: Winnipeg
Boat: None at this time
Posts: 7,930
Just to be clear about one thing. I don't have any experience with the products the site was selling. I was only commenting on how to connect the alternator to the house batteries and how to charge the start battery with the Echo charge. I believe that was what the question was about.
__________________

__________________
The Blue Dot Campaign. This Changes Everything.
DeepFrz is offline   Reply With Quote
Reply

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
Chain to Rope Connection Firehoser75 Anchoring & Mooring 20 15-09-2011 17:05
Pipe Head Resistance Stevens 47 Plumbing Systems and Fixtures 7 31-01-2009 19:53
Transatlantic Internet Connection Tom and Maje Marine Electronics 6 03-11-2008 20:40
At what resistance do you change the battery wiring? Cadence10m Electrical: Batteries, Generators & Solar 13 04-11-2007 18:08
Tachometer connection ScratchBC Engines and Propulsion Systems 4 21-05-2006 18:50



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 11:59.


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.