Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 11-03-2016, 08:46   #31
Don't ask if you can't handle it
 
sailorboy1's Avatar

Cruisers Forum Supporter

Join Date: Jul 2007
Location: On the boat somewhere
Boat: Hunter 410
Posts: 12,308
Re: Magic DC

Quote:
Originally Posted by skipmac View Post
Still got a reading. Smaller 0.2 mV but still showed a voltage potential.

Here's another question (or two). Don't you have an always on circuit directly to the battery and bypassing the panel for a bilge pump? Is that connected when you see the monitor come on? yes my bllge pump bypasses the main DC panel. But it was off as the negative cables on the batteries weren't on the batteries yet.

What about the battery charger? Is that operating when this happens? It wasn't on. The main AC supply breaker was open/off.
I know that I've seen this "problem" when both disconnecting and connecting the batteries. I don't know if shore power was physically plugged in every time (it probably was).

Maybe I'll try some experiments. Since the BM powers up and the display lights up it probably could light the LED ion the main DC breaker if I shut that. I could also setup the same conditions and pull the fuse on he little start battery solar power.
__________________

__________________
jobless, houseless, clueless, living on a boat and cruising around somewhere
sailorboy1 is offline   Reply With Quote
Old 12-03-2016, 00:49   #32
Moderator
 
Paul Elliott's Avatar

Cruisers Forum Supporter

Join Date: Sep 2006
Posts: 3,864
Images: 4
Re: Magic DC

Does this BM power up even with the battery (+) disconnected? With all the wires that normally go to the (+) being connected together?

I'm telling you that the battery with the (-) completely disconnected has *nothing* to do with your problem, unless there is a stray path or overlooked connection. You are looking in the wrong place. Simplify your problem. Disconnect all possible power sources. This is not magic. When you figure this out it will, in retrospect, be ridiculously obvious.
__________________

__________________
Paul Elliott, S/V VALIS - Pacific Seacraft 44 #16 - Friday Harbor, WA
www.sailvalis.com
Paul Elliott is offline   Reply With Quote
Old 12-03-2016, 06:19   #33
Don't ask if you can't handle it
 
sailorboy1's Avatar

Cruisers Forum Supporter

Join Date: Jul 2007
Location: On the boat somewhere
Boat: Hunter 410
Posts: 12,308
Re: Magic DC

Quote:
Originally Posted by Paul Elliott View Post
Does this BM power up even with the battery (+) disconnected? With all the wires that normally go to the (+) being connected together?
Don't know which is why I said it may have something to do with the little start battery solar panel.
__________________
jobless, houseless, clueless, living on a boat and cruising around somewhere
sailorboy1 is offline   Reply With Quote
Old 12-03-2016, 07:42   #34
Senior Cruiser
 
Captain Bill's Avatar

Cruisers Forum Supporter

Join Date: Apr 2008
Location: On the boat
Boat: Endeavourcat Sailcat 44
Posts: 2,313
Re: Magic DC

You said you connected all of the positive terminals first. I assume that this includes the + lead from the solar panel. If the negative lead from the sol ar panel is attached to the negative bus you now have a complete circuit. I assume that normally you disconnect all of the positive connections but the solar panel from the battery for the winter, thus isolating your battery monitor so it is not seeing the power from the solar panel. When you connect all the + leads together at the battery it can now see the power from the solar panel. The solar panel does not require a battery in the circuit to produce power, just a current path from the + to the - leads.
__________________
Captain Bill is offline   Reply With Quote
Old 12-03-2016, 18:58   #35
Registered User

Join Date: Apr 2013
Location: So Cal
Boat: Catalina 30
Posts: 943
Re: Magic DC

What Captain Bill said.

Fun thread, too bad I was out sailing today.

Static electricity IS a full circuit. There's just a big capacitor in it.

And of course, you do need some sort of a circuit for current to flow. Nothing's magic.
__________________
jeepbluetj is offline   Reply With Quote
Old 13-03-2016, 13:43   #36
Senior Cruiser

Cruisers Forum Supporter

Join Date: Mar 2014
Location: Anacortes
Boat: previous - Whitby 42 new - Goldenwave 44
Posts: 1,735
Re: Magic DC

Quote:
Originally Posted by boatpoker View Post
ABYC requires the DC negative to be bonded to the AC ground,

I have studied electricity for years ( maybe one day I'll understand a little bit of it) and noticed recently that all of what we think of as known science in electrical matters is still noted as "theory" in serious scientific journals.
I've never noticed any journals which discuss basic electricity as "theory". In the scientific community when you describe something as a "law" it is considered a given "fact". E.g. Ohm's Law.
__________________
exMaggieDrum is offline   Reply With Quote
Old 21-03-2016, 21:11   #37
Coastal Cruiser.
 
uncle stinkybob's Avatar

Cruisers Forum Supporter

Join Date: Mar 2016
Location: P.N.W.
Boat: Lancer 30-5
Posts: 632
Re: Magic DC

I've never been afraid to ask a stupid question so.....if there were a piece of equipment wired in to the circuit that had an internal memory thus an internal battery, could it possible cause this?
__________________
uncle stinkybob is offline   Reply With Quote
Old 30-03-2016, 20:00   #38
Moderator
 
Paul Elliott's Avatar

Cruisers Forum Supporter

Join Date: Sep 2006
Posts: 3,864
Images: 4
Re: Magic DC

Sailorboy1, did you ever figure this out? Don't keep us in suspense!
__________________
Paul Elliott, S/V VALIS - Pacific Seacraft 44 #16 - Friday Harbor, WA
www.sailvalis.com
Paul Elliott is offline   Reply With Quote
Old 31-03-2016, 05:59   #39
Don't ask if you can't handle it
 
sailorboy1's Avatar

Cruisers Forum Supporter

Join Date: Jul 2007
Location: On the boat somewhere
Boat: Hunter 410
Posts: 12,308
Re: Magic DC

Quote:
Originally Posted by Paul Elliott View Post
Sailorboy1, did you ever figure this out? Don't keep us in suspense!
No, have had more important things to work on. I do feel it is likely that it is the small solar panel for the start battery even though the battery isolator should prevent it from getting power (guess it leaks enough mA).
__________________

__________________
jobless, houseless, clueless, living on a boat and cruising around somewhere
sailorboy1 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
Navtex for PC - Magic box? Moerer WIB2 switchcat Marine Electronics 5 12-12-2008 14:48
Magic Words to Use in Italy Quijote Europe & Mediterranean 24 21-07-2008 01:30
Magic Stainless Steel Cleaner otgadventures Deck hardware: Rigging, Sails & Hoisting 13 27-06-2007 08:15
The magic 50 Catamount Meets & Greets 1 04-12-2005 07:30



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 09:50.


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.