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12V DC Load Path [message #366206]

Wed, 18 August 2021 13:34

Afastchief

Messages: 9
Registered: October 2011
Location: King NC

Karma: 0

Junior Member

Hello,

I want to install a Victron BMV700 battery monitor. The instructions are straight forward until I get to my coach and try and identify the 12v negative side load path for house circuits. The aluminum plate have several positive circuit bus bars but not a common neg bus bar. What is the best way to capture the house side battery loads so I can direct to shunt "load side"? Thank you...Alan

Alan Edmondson King, NC 78 Royale, engine bay insulation, dual cockpit fans, Victron 160A isolator, Yandina combiner, Victron BMV 700 battery monitor with Bluetooth, Progressive Dynamics 9200 converter

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[GMCnet] Re: 12V DC Load Path [message #366208 is a reply to message #366206]

Wed, 18 August 2021 14:03

bdub

Messages: 1578
Registered: February 2004
Location: Central Texas

Karma: 5

Senior Member

Where are you installing? I attached my BMV700 ground to the house ground
in the electrical cabinet.

bdub

-----Original Message-----
From: Alan Edmondson [mailto:afastchief@gmail.com]
Sent: Wednesday, August 18, 2021 1:35 PM
To: gmclist@list.gmcnet.org
Subject: [GMCnet] 12V DC Load Path

Hello,

I want to install a Victron BMV700 battery monitor. The instructions are
straight forward until I get to my coach and try and identify the 12v
negative side load path for house circuits. The aluminum plate have several
positive circuit bus bars but not a common neg bus bar. What is the best
way to capture the house side battery loads so I can direct to shunt "load
side"? Thank you...Alan
--
Alan Edmondson
King, NC
78 Royale, engine bay insulation, dual cockpit fans, Victron 160A isolator,
Yandina combiner, Victron BMV 700 battery monitor with Bluetooth,
Progressive Dynamics 9200 converter
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bdub
'76 Palm Beach/Central Texas
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Re: [GMCnet] Re: 12V DC Load Path [message #366209 is a reply to message #366208]

Wed, 18 August 2021 14:50

Afastchief

Messages: 9
Registered: October 2011
Location: King NC

Karma: 0

Junior Member

My intent was to install shunt beside the diode isolator above batteries. Definitely want to keep wire length to a minimum.

Alan

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[GMCnet] Re: 12V DC Load Path [message #366211 is a reply to message #366209]

Wed, 18 August 2021 18:17

Billy Massey

Messages: 916
Registered: January 2004
Location: Central Texas

Karma: 1

Senior Member

So are your house batteries up front, below the firewall? If so, connect
directly to the negative post.

A question like this needs to include all pertinent information in order to
get an informed answer.
What model GMC do you have?
Where is your house battery (s) located?

bdub

On Wed, Aug 18, 2021, 2:50 PM Alan Edmondson wrote:

> My intent was to install shunt beside the diode isolator above batteries.
> Definitely want to keep wire length to a minimum.
>
> Alan
> --
> Alan Edmondson
> King, NC
> 78 Royale, engine bay insulation, dual cockpit fans, Victron 160A
> isolator, Yandina combiner, Victron BMV 700 battery monitor with Bluetooth,
> Progressive Dynamics 9200 converter
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
>
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bdub
bdub.net

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Re: 12V DC Load Path [message #366212 is a reply to message #366206]

Wed, 18 August 2021 18:32

JohnS

Messages: 126
Registered: December 2014
Location: Vacaville, CA

Karma: -2

Senior Member

Remove the cable from the the house battery negative terminal and connect it to one end of the shunt. Run a new battery cable from the other end of the shunt to the house battery negative terminal. Only this way will all the house battery current run thru the shunt and allow accurate readings on the Victron battery monitor.

I am not familiar with the location of the batteries in a Royale, so cannot advise on where to mount the shunt. Just insure that the cables used are of sufficient size, especially if you will be powering an inverter.

JWID JohnS

John Shutzbaugh, Vacaville, CA, ncserv@aol.com; 78 Buskirk stretch, "What were we thinking?"

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Re: 12V DC Load Path [message #366214 is a reply to message #366206]

Wed, 18 August 2021 20:29

Afastchief

Messages: 9
Registered: October 2011
Location: King NC

Karma: 0

Junior Member

I should have clarified battery locations. On my Royale it has a Honda generator back left with start battery aft of it. I have two batteries up front on passenger side with fwd battery supplying chassis and aft battery the house. So the intent is to put shunt in series with negative side of house battery. I will locate the shunt next to isolator and that will make connections short and simple.

I appreciate the advice...Alan

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Re: 12V DC Load Path [message #366216 is a reply to message #366214]

Wed, 18 August 2021 21:44

Matt Colie

Messages: 8547
Registered: March 2007
Location: S.E. Michigan

Karma: 7

Senior Member

Afastchief wrote on Wed, 18 August 2021 21:29

I should have clarified battery locations. On my Royale it has a Honda generator back left with start battery aft of it. I have two batteries up front on passenger side with fwd battery supplying chassis and aft battery the house. So the intent is to put shunt in series with negative side of house battery. I will locate the shunt next to isolator and that will make connections short and simple.

I appreciate the advice...Alan

Alan,

Now this all makes sense. I thought only the early coaches had the house bank in the front. As this happens, now I can tell you that John is correct. I know this because that is what I did. We have a Bogart not a Victronic, but the same idea and it works like a champ except that I have been chasing a phantom 200mA drain for a couple of years now.

I just love seeing that state of charge say "100".

Matt

Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit

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Re: 12V DC Load Path [message #366217 is a reply to message #366206]

Thu, 19 August 2021 06:40

Tilerpep

Messages: 404
Registered: June 2013
Location: Raleigh, NC

Karma: 7

Senior Member

I have a 75 GMC upfit with one front engine battery and one rear house battery. I have a 78 Coachmen upfit also. I thought the Coachmen upfit followed the 73 GMC wiring idea, as it had a battery in rear by genny, and two up front by engine. I was very surprised when I finally figured out the Royale actually had one front battery and the rear battery in PARALLEL for the house system. Not, as expected, with rear battery setup only as genny starter. Relevant to your question about the monitor, because there is not one ground point for the house load. I put a monitor on the 75 and it was relatively simple. I do not know how I would do 78 Royale without moving something.

1975 Glenbrook, 1978 Royale rear bath Raleigh, NC

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[GMCnet] Re: 12V DC Load Path [message #366218 is a reply to message #366217]

Thu, 19 August 2021 08:20

Keith V

Messages: 2337
Registered: March 2008
Location: Mounds View,MN

Karma: 0

Senior Member

My ex royale came with a generator battery and a #2 or maybe #0 battery cable that runs all the way to the front.
I just removed the battery and the gen starts just fine off the house battery

Keith Vasilakes
Mounds View MN
76 exRoyale
MicroLevel

________________________________
From: Tyler
Sent: Thursday, August 19, 2021 6:40 AM
To: gmclist@list.gmcnet.org
Subject: [GMCnet] Re: 12V DC Load Path

I have a 75 GMC upfit with one front engine battery and one rear house battery. I have a 78 Coachmen upfit also. I thought the Coachmen upfit followed
the 73 GMC wiring idea, as it had a battery in rear by genny, and two up front by engine. I was very surprised when I finally figured out the Royale
actually had one front battery and the rear battery in PARALLEL for the house system. Not, as expected, with rear battery setup only as genny starter.
Relevant to your question about the monitor, because there is not one ground point for the house load. I put a monitor on the 75 and it was relatively
simple. I do not know how I would do 78 Royale without moving something.
--
1975 Glenbrook, 1978 Royale rear bath
Raleigh, NC
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Keith Vasilakes
Mounds View. MN
75 ex Royale GMC
ask me about MicroLevel
Cell, 763-732-3419
My427v8@hotmail.com

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