SailNet Community - Reply to Topic

   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 > Does the Starting battery also need to be wired behind the Victron BMV-602S shunt?
 Not a Member? 


Thread: Does the Starting battery also need to be wired behind the Victron BMV-602S shunt? Reply to Thread
Title:
  

By choosing to post the reply below you agree to the rules you agreed to when joining Sailnet.
Click Here to view those rules.

Message:
Trackback:
Send Trackbacks to (Separate multiple URLs with spaces) :
Post Icons
You may choose an icon for your message from the following list:
 

Register Now

In order to be able to post messages on the SailNet Community forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
Please note: After entering 3 characters a list of Usernames already in use will appear and the list will disappear once a valid Username is entered.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Click here to view the posting rules you are bound to when clicking the
'Submit Reply' button below


Additional Options
Miscellaneous Options

Click here to view the posting rules you are bound to when clicking the
'Submit Reply' button below


Topic Review (Newest First)
01-25-2013 06:01 AM
KlootNZ
Re: Does the Starting battery also need to be wired behind the Victron BMV-602S shunt

Thanks for confirming Maine Sail and mitiempo,

I suspected as much, all making sense now. I have a 3-battery bank (two house, one starter), so need to monitor two batteries. On top of that, they are not identical.....
I'm interested in the shunt because I'm building my own battery monitors to communicate with the other parts of my system (and I need bigger displays too). There are plenty of shunt resistors available, but few are rated/tested in a marine environment, so this one seems fit for purpose.

Does the Victron shunt really have built-in electronics? Looks like just a few passive components/connectors on the circuit board (unless there are SMD's on the bottom side where it could get hot). If yes it could be interesting to decode the signal which may save some re-inventing of the wheel.

Cheers!
Kloot
01-25-2013 05:22 AM
Maine Sail
Re: Does the Starting battery also need to be wired behind the Victron BMV-602S shunt

If you want to measure anything other than VOLTAGE, on the second bank, then you'll need a second complete battery monitor. You can not add a second shunt to the Victron battery monitors. They read current and count Ah's for one bank only..
01-25-2013 05:16 AM
mitiempo
Re: Does the Starting battery also need to be wired behind the Victron BMV-602S shunt

Only voltage is measured for battery 2. Usually battery 2 is a starting battery and as such is seldom down more than 1 or 2 AH.

Shunts are available separately from many sources, Blue Seas for one. The one supplied with the Victron is unique though as it has built in electronics and is designed to only connect with the Victron head unit.

Why do you want a shunt by itself?
01-25-2013 03:49 AM
KlootNZ
Re: Does the Starting battery also need to be wired behind the Victron BMV-602S shunt

Hi All,

This is the best discussion of the subject on the web, so hopefully I can rewake it once more.

Can someone please let me know whether the charge or current (not voltage!) to/from battery 2 in the diagram from victron energy (in Stu's and Brian's posts, sorry I'm not allowed to post links) is measured at all. I fail to understand how that would work given that current from/to battery 2 can bypass the shunt altogether.

Also, does anyone know whether the shunt can be purchased separately?

Thanks from down under!
Kloot
07-14-2012 09:10 PM
Stu Jackson
Re: Does the Starting battery also need to be wired behind the Victron BMV-602S shunt

Quote:
Originally Posted by tgalea View Post
If however i scroll through the displays and go back to the current display and now have the back light on it will show a discharge of 1.68 amps.

It is also interesting that if say i am drawing 5.0 amps from the batteries (fridge on) it will show I -5.00 when back light is off and I - 6.68 when back light is on.

I have a feeling it has something to do with the fact that the starter negative is also connected to the shunt.

Any opinions?

Thanks
Tyrone
Sure, your backlight is making this draw (unless you have something else on that we don't or can't know about). I agree with Brian, and it shouldn't have anything to do with the starter negative on the load side. IIRC, it turns itself off on your Victron. On my Link 2000 I have to set its intensity.

Check the manual, IIRC it shows how to reduce it or turn it off. 1.68 ounds high, my Link 2000 uses 0.1 A with backlighting at full.

Have you tried disconnecting the reserve bank and seeing what happens?

Do you haev B1 & B2 connnected right? http://www.victronenergy.com/upload/...e%20-%20EN.pdf
07-12-2012 03:29 PM
mitiempo
Re: Does the Starting battery also need to be wired behind the Victron BMV-602S shunt

If your starter is connected to the load side of the shunt (and not the battery side) it should make no difference.

If the only difference is the backlight then it is causing the 1.68 amp draw. Seems excessive though.
07-12-2012 09:32 AM
tgalea
Re: Does the Starting battery also need to be wired behind the Victron BMV-602S shunt

Hi,

i am hoping to re-awake this thread.

I have the exact setup as described above with the start battery negative on the load side of the shunt.

All works well except that when the BMV602s back light is off current draw reads 0.00 (that is with all loads and chargers disconnected). If however i scroll through the displays and go back to the current display and now have the back light on it will show a discharge of 1.68 amps.

It is also interesting that if say i am drawing 5.0 amps from the batteries (fridge on) it will show I -5.00 when back light is off and I - 6.68 when back light is on.

I have a feeling it has something to do with the fact that the starter negative is also connected to the shunt.

Any opinions?

Thanks
Tyrone
09-09-2011 08:19 PM
mitiempo On the other hand if you use your house bank for house loads and engine starting you can leave the other battery as an "emergency" battery. This battery can be wired to the bus after the shunt and Victron's diagram I posted is the proper way to wire it. The BMV-602 will read the start/emergency battery voltage which is all you need to know. With this exception the data on the Victron relates to the house bank, which is the one you need the info on. There would not be any need to ever combine the battery banks. If the house bank was not enough to start the engine the emergency battery by itself will do the job.
09-09-2011 07:00 PM
CapTim
Quote:
Originally Posted by Maine Sail View Post
When you "combine" banks of different charge levels current flows in or out between them until they "equalize" and the current stops flowing. The only way to read this is to wire the start/reserve battery to the load side of the shunt.
Ahh.. that was the part I was missing in my head. Well, that and the diagram from Brian!
09-09-2011 06:25 PM
Maine Sail Yes the start battery should go on the "load" side of the shunt not the battery side. If the banks are combined via a parallel switch of BOTH feature you WANT that outflow or inflow of current from the lower or higher charged bank to be read.

When you "combine" banks of different charge levels current flows in or out between them until they "equalize" and the current stops flowing. The only way to read this is to wire the start/reserve battery to the load side of the shunt.
This thread has more than 10 replies. Click here to review the whole thread.

 
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


All times are GMT -4. The time now is 05:41 AM.

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.