Cruisers Forum

Join CruisersForum Today

  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on Cruisers Forums. Advertise Here
Thread Tools Search this Thread Rate Thread Display Modes
Old 15-01-2019, 23:13   #16
Registered User

Join Date: Jun 2013
Location: canada
Posts: 2,511
Re: Where do I put my Shunt?

Originally Posted by OS2Dude View Post
I've read many items that say the battery negative should go to a bus bar where all the other major grounds connect (including the engine.) It is recommended that the engine block NOT be a part of the negative circuit.

A side question: Why a shunt in the negative side? Does it matter? On our vessel the shunt is in the positive side. I guess if you want the alternator output to be apart of the meter the negative side would be easier. If that is the case, wouldn't having the shunt between the alternator and loads be the correct position? (Given the engine block is a part of the negative circuit.)
if you put the shunt on the pos side, both of the small shunt wires need to be fused. where as the ground wires do not. so it's safer on ground side. and less things in the connection to mess up the reading. even a tiny voltage drop in the meter fuses would make a big difference when the meter is reading mv

some gauges may only work with it one way or the other.

some places you can only measure on the pos. like most alternators.

a battery monitor shunt goes in A

I would reroute the main panel neg to the battery (load side of shunt) and not through engine block.

smac999 is offline   Reply With Quote
Old 16-01-2019, 00:06   #17
Registered User
CatNewBee's Avatar

Join Date: Aug 2017
Boat: Lagoon 400S2
Posts: 2,218
Re: Where do I put my Shunt?

Disconnect negative from the battery and mount all wires disconnected to the shunt, make a new cable from the shunt to the battery negative and do not connect anything else to the negative pole of the battery.

That makes sure all current to and from the battery must pass the shunt.
If the shunt has also a voltage sensor board, connect the small plus wire via a separate fuse directly to the battery plus, the fuse as near as possible to the battery.

Lagoon 400S2 refit for cruising: LiFeYPO4, solar and electric galley...
CatNewBee is online now   Reply With Quote
Old 16-01-2019, 05:30   #18
Registered User

Join Date: Mar 2013
Location: South Jersey
Posts: 375
Re: Where do I put my Shunt?

With the shunt at point 'A' all the current to and from the battery will be measured, even if the alternator negative is to the block. The block negative returns to the battery through point 'A'.

Many heavy duty, even OEM, alternators have a separate negative lug on their case. That can go to the block or directly to the battery negative.
If you are only using the shunt for a amp meter and not a battery monitor, I guess a small amount of current from the alternator to the panel could be missed. Someday I will draw this out and see how.

Zil is offline   Reply With Quote

Thread Tools Search this Thread
Search this Thread:

Advanced Search
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
Want To Buy: Link 2000 with Shunt - 84-2000-06 yacht_planb Classifieds Archive 2 21-02-2010 12:44
Location of Shunt bobelon Electrical: Batteries, Generators & Solar 9 27-03-2009 12:11
Battery Shunt ? ? ? S/V Mother Ocean Electrical: Batteries, Generators & Solar 5 22-10-2008 09:32
Battery Shunt ? ? ? S/V Mother Ocean Multihull Sailboats 3 21-10-2008 18:22
link 10 shunt on +? Ryan Electrical: Batteries, Generators & Solar 6 27-09-2005 14:17

Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 13:34.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2019, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.