Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 08-09-2015, 10:08   #31
Moderator
 
Dockhead's Avatar

Cruisers Forum Supporter

Join Date: Mar 2009
Location: Cowes (Winter), Baltic (Summer) (the boat!); somewhere in the air (me!)
Boat: Cutter-Rigged Moody 54
Posts: 19,752
Re: Current Measurement?

Quote:
Originally Posted by weavis View Post
What? Im of the school that one ground is the way to go. Everything on my Centaur was ground to the "chassis" so to speak. All batteries were connected to the common ground.
Grounds are connected together. But loads are connected to different buses which are located about 25 feet apart.

I could create a single common business between the two, but it would be a significant job. Or interpose a loop to the other business, from one bus, but that's poor. So I live with what I have.

Sent from my D6633 using Cruisers Sailing Forum mobile app
__________________

__________________
"Parce que je suis heureux en mer, et peut-Ítre pour sauver mon ame. . . "
Dockhead is offline   Reply With Quote
Old 08-09-2015, 10:14   #32
Moderator
 
weavis's Avatar

Cruisers Forum Supporter

Join Date: Feb 2014
Location: SEVILLE - MALLORCA
Posts: 10,140
Send a message via Skype™ to weavis
Re: Current Measurement?

Quote:
Originally Posted by Dockhead View Post
Grounds are connected together. But loads are connected to different buses which are located about 25 feet apart.

I could create a single common business between the two, but it would be a significant job. Or interpose a loop to the other business, from one bus, but that's poor. So I live with what I have.

Sent from my D6633 using Cruisers Sailing Forum mobile app
Yep
No point in going to expense or trouble if thats what you have.

__________________

__________________
- Never test how deep the water is with both feet -
10% of conflicts are due to different opinions. 90% by the tone of voice.
Raise your words, not your voice. It is rain that grows flowers, not thunder.
weavis is online now   Reply With Quote
Old 08-09-2015, 10:15   #33
Registered User
 
Ericson38's Avatar

Join Date: Aug 2012
Location: Virginia
Boat: Taswell 49 Cutter
Posts: 187
Re: Current Measurement?

Quote:
Originally Posted by Dockhead View Post
The root problem is that there are two negative buses which feed separate groups of equipment. I could cut the connection between one set of batts and one of the busses, feed it back up to the other bus with a heavy cable, then tie back to the first bus with another heavy cable, but this would introduce long cable runs for heavy power consumers (10 horsepower bow thruster) -- definitely not a good idea.

My through hulls, mast, etc. are not bonded -- per modern practice.


Reading back, you have two banks now, a 12 V and a 24 V bank. Not sure I followed your above description on what you propose possibly cutting and feeding back. How much voltage do you measure between the two negative bus bars, typically ? How far apart are they, physically ? I take it you want to joint these two bus - sides, and I'm saying you should be able to determine with a meter if they are electrically floating from each other. On another point, though, if they are seemingly at the same potential on their negative sides, it could be through a piece of equipment or housing that you didn't intend to be the 'bridge'.

On your bonding system, are you keeping everything under water isolated from each other item, such as prop shaft from transmission, rudder-quadrant-cables-pedestal from the engine, etc, or just the individual bronze through hulls isolated ?

On the mast, how do you eliminate the buildup of static electricity in stormy conditions ? Your SSB ground plane plate is bonded to the mast base, correct ?

Think about the steering quadrant for a minute, with its engine controls and chain to the rudder quadrant. It is connected to the engine / transmission via the wire control cables. It is connected to the rudder post via the chains, unless it is hydraulic. Unless you have a drive-isolater between the transmission flange and the propshaft coupling, the prop and shaft are also bonded to the engine and rudder post, effectively.
__________________
Ericson38 is offline   Reply With Quote
Old 08-09-2015, 12:19   #34
Moderator
 
Dockhead's Avatar

Cruisers Forum Supporter

Join Date: Mar 2009
Location: Cowes (Winter), Baltic (Summer) (the boat!); somewhere in the air (me!)
Boat: Cutter-Rigged Moody 54
Posts: 19,752
Re: Current Measurement?

Quote:
Originally Posted by Ericson38 View Post
Reading back, you have two banks now, a 12 V and a 24 V bank. Not sure I followed your above description on what you propose possibly cutting and feeding back. How much voltage do you measure between the two negative bus bars, typically ? How far apart are they, physically ? I take it you want to joint these two bus - sides, and I'm saying you should be able to determine with a meter if they are electrically floating from each other. On another point, though, if they are seemingly at the same potential on their negative sides, it could be through a piece of equipment or housing that you didn't intend to be the 'bridge'.

On your bonding system, are you keeping everything under water isolated from each other item, such as prop shaft from transmission, rudder-quadrant-cables-pedestal from the engine, etc, or just the individual bronze through hulls isolated ?

On the mast, how do you eliminate the buildup of static electricity in stormy conditions ? Your SSB ground plane plate is bonded to the mast base, correct ?

Think about the steering quadrant for a minute, with its engine controls and chain to the rudder quadrant. It is connected to the engine / transmission via the wire control cables. It is connected to the rudder post via the chains, unless it is hydraulic. Unless you have a drive-isolater between the transmission flange and the propshaft coupling, the prop and shaft are also bonded to the engine and rudder post, effectively.
I had four banks, 2 x 24v and 2 x 12v, now I have three: 1 x 24v, and 2x 12v, but the 24v bank is formed out of two banks so has a weird architecture.

The two former banks were made into one by binding the positive sides together but leaving everything else as it was. That allows consumers to draw from the combined batteries of both former banks -- the point of it all.

As to grounding and anodic protection of other things -- that's a bit beyond the scope of the thread and certainly beyond the scope of my meager understanding, but it all works fine.
__________________

__________________
Dockhead is offline   Reply With Quote
Reply

Tags
current, men

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
Boat Size - LOD vs LOA for Marina Berth Measurement muzzbishop General Sailing Forum 29 23-03-2016 08:06
Measurement needed on 1976 26' Tollycraft Sedan Hellyann Meets & Greets 2 01-09-2014 05:31
True Wind Measurement sailboat1970 Marine Electronics 24 09-10-2010 07:42
Bahia 46: USGC Simplified Measurement numbers GlobalHopper Fountaine Pajot 0 19-04-2010 09:33
flashing display in deep measurement Milton Bertin Marine Electronics 1 14-04-2009 03:23



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 09:18.


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.