Victron Smart Shunt Readings (1 Viewer)

Feb 22, 2016
3,641
11,080
York
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41,744
MH
Bailey 620 Approach
Exp
Since 2015
Went to check on van today to clear out oven and grill etc (which we use for storage rather than cooking) in anticipation of habitation check.

Apart from the van being collected for its MOT and annual service last week it's been stood indoors with no hookup. I attach screen shots below from the app.

I decided to put it on hook up to ensure that the starter battery is topped up as although there is a battery master fitted (before having lithium batteries fitted) I sometimes find that the starter battery reads 12.5 volts rather than 12.7 12.9 which I understand to be the reading when fully charged. What I found a little confusing when I went to 'Trends' all it showed was activity on the starter battery which I don't understand. Should there not have been info on the leisure battery?


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Dec 31, 2010
2,653
5,861
Sunny South Shields
Funster No
14,797
MH
Frankia Platin i7900
Exp
Since 2010
Have you got your starter battery connected to the shunt? If not it's a easy thing to do 1 wire job, on the trends screen you decide what you want to see by selecting the pull down menu were you have noneđź”»and starter batteryđź”»
 
OP
OP
Ingwe
Feb 22, 2016
3,641
11,080
York
Funster No
41,744
MH
Bailey 620 Approach
Exp
Since 2015
Have you got your starter battery connected to the shunt? If not it's a easy thing to do 1 wire job, on the trends screen you decide what you want to see by selecting the pull down menu were you have noneđź”»and starter batteryđź”»
No, when they fitted the lithiums and the associated gear (shunt, mppt controller, ip22 charger and b2b) they said no need to connect starter battery to shunt. Said that the van’s control panel would suffice for starter battery reading.
I was thinking that a wire could go from the b2b to the shunt but not sure and unclear of the wire needed. Looking at Victron’s home page the shunt should have come with a lead for the starter battery.
How do these leads attach? Is it fairly straight forward for s DIY er?
 
Last edited:
May 17, 2016
3,639
7,882
Aberdeenshire
Funster No
43,137
MH
B524
Exp
2nd base
Yes easy enough to connect to as long as the wires are long enough to reach from battery to shunt. You'll have to do this if you want to see the state of your starter battery via your Victron app.
 

Lenny HB

LIFE MEMBER
Oct 18, 2007
54,129
152,812
On the coast in West Sussex
Funster No
658
MH
Hymer B678 DL
Exp
Since 2008 & many years tugging
I see you are up north I know someone in Scotland that had trouble keeping the starter battery topped up with a Batterymaster from a lithium hab battery, I recommend he changed to an Ablemail battery maintainer, it solved the problem.

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OP
OP
Ingwe
Feb 22, 2016
3,641
11,080
York
Funster No
41,744
MH
Bailey 620 Approach
Exp
Since 2015
Yes easy enough to connect to as long as the wires are long enough to reach from battery to shunt. You'll have to do this if you want to see the state of your starter battery via your Victron app.
Can i not go from the b2b to shunt? They’re right next to each other.
 
Dec 31, 2010
2,653
5,861
Sunny South Shields
Funster No
14,797
MH
Frankia Platin i7900
Exp
Since 2010
No, when they fitted the lithiums and the associated gear (shunt, mppt controller, ip22 charger and b2b) they said no need to connect starter battery to shunt. Said that the van’s control panel would suffice for starter battery reading.
I was thinking that a wire could go from the b2b to the shunt but not sure and unclear of the wire needed. Looking at Victron’s home page the shunt should have come with a lead for the starter battery.
How do these leads attach? Is it fairly straight forward for s DIY er?
Yeah you could take the feed from the b2b starter battery feed then to the shunt you are supplied with the fused wires from victron to do this it connects the Aux input on the side of the shunt to your starter battery.

See here.

 
Last edited:
Dec 31, 2010
2,653
5,861
Sunny South Shields
Funster No
14,797
MH
Frankia Platin i7900
Exp
Since 2010
Don't forget to set the Aux input in victron connect app to starter battery which I think you have as it's showing but just check👍🏻

Screenshot_20221128_132130_com.victronenergy.victronconnect_edit_14901658336787.jpg
Screenshot_20221128_132141_com.victronenergy.victronconnect_edit_14937236199282.jpg
Screenshot_20221128_132151_com.victronenergy.victronconnect_edit_14976352118026.jpg
 
Apr 27, 2016
6,945
8,113
Manchester
Funster No
42,762
MH
A class Hymer
Exp
Since the 80s
No, when they fitted the lithiums and the associated gear (shunt, mppt controller, ip22 charger and b2b) they said no need to connect starter battery to shunt. Said that the van’s control panel would suffice for starter battery reading.
I was thinking that a wire could go from the b2b to the shunt but not sure and unclear of the wire needed. Looking at Victron’s home page the shunt should have come with a lead for the starter battery.
The shunt only measures the voltage of the starter battery, it doesn't measure any amps like it does for the leisure battery. It was originally designed to keep an eye on the 'midpoint ' voltage of a 24V leisure battery bank - two 12V in series - but if the leisure battery is 12V it can be repurposed to keep an eye on the starter battery voltage. So in that sense it doesn't give you any more information than the van's control panel. But I suppose it might be more accurate and reliable.

For perfect accuracy you should run a single continuous wire all the way from the shunt to the starter battery (with a fuse, maybe 2A or 5A). If you run the wire to the starter battery input of the B2B, then there will be a small error due to voltage drop while the B2B is operating (while the engine is running). I think when the engine is stopped there will be no error.
 
OP
OP
Ingwe
Feb 22, 2016
3,641
11,080
York
Funster No
41,744
MH
Bailey 620 Approach
Exp
Since 2015
The shunt only measures the voltage of the starter battery, it doesn't measure any amps like it does for the leisure battery. It was originally designed to keep an eye on the 'midpoint ' voltage of a 24V leisure battery bank - two 12V in series - but if the leisure battery is 12V it can be repurposed to keep an eye on the starter battery voltage. So in that sense it doesn't give you any more information than the van's control panel. But I suppose it might be more accurate and reliable.

For perfect accuracy you should run a single continuous wire all the way from the shunt to the starter battery (with a fuse, maybe 2A or 5A). If you run the wire to the starter battery input of the B2B, then there will be a small error due to voltage drop while the B2B is operating (while the engine is running). I think when the engine is stopped there will be no error.
So, in reality, I can keep my eye on the starter battery’s voltage adequately with the van’s control panel allowing for voltage drop? If so it hardly seems worth the effort to run a wire from the shunt to the starter battery.

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Hoovie

Free Member
May 16, 2021
1,249
1,689
Funster No
81,251
MH
Autotrail
The shunt only measures the voltage of the starter battery, it doesn't measure any amps like it does for the leisure battery. It was originally designed to keep an eye on the 'midpoint ' voltage of a 24V leisure battery bank - two 12V in series - but if the leisure battery is 12V it can be repurposed to keep an eye on the starter battery voltage. So in that sense it doesn't give you any more information than the van's control panel. But I suppose it might be more accurate and reliable.

For perfect accuracy you should run a single continuous wire all the way from the shunt to the starter battery (with a fuse, maybe 2A or 5A). If you run the wire to the starter battery input of the B2B, then there will be a small error due to voltage drop while the B2B is operating (while the engine is running). I think when the engine is stopped there will be no error.
What he said :) I was going to make the same point as Autorouter. On a SmartShunt there is little to be gained in terms of monitoring the starter battery voltage for the typical user.
It does sound like the installer couldn't be bothered to run a wire so used an excuse instead though.

There are however 3 possible advantages to connect ....
1) You can check the SB Voltage on the phone if you are too lazy to stand up and use the existing control panel :)
2) You can set an alarm on the Smartshunt on the SB voltage, so get warned if it is too low - OR too high. Have to say I have never used this option but it is there notheless.

3) This applies to the BMV-702/BMV-712 rather than the Smartshunt, but other readers might be interested .... You can control the BMV Relay based on SB Voltage. I have actually used this to monitor the voltage of a battery connected to the Aux and when it got low, turn on a battery charger.
 
Sep 18, 2015
699
703
Selby, North Yorkshire
Funster No
38,564
MH
Rapido 8066DF
I plan to install a lithium battery and B2B so heres a question do you need a smart shunt or do you get the same info from the BMS app or is not that simple. Regards Bill.
 

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