Victron

[steveswift]

Hi there , I wonder if any one can shed any light on the following , I have 2 lithium batteries and a victron set up dc to dc etc ,
It’s behaving oddly , when driving with power off large with power of 15-17a are being drawn , when sitting with power on , lights and tv much less is being drawn 3-5a , somthing doesn’t seem right.

Please see attached 2 screen shots of shunt info .. one whilst driving with power off , and one sat with power on and just bedroom light on.

Is it normal that’s it’s drawing so much power whilst off ?

Many thanks in advance

The one showing 90% is whilst driving from Spain to France

The one showing 72% is after reaching france.

18% has gone somewhere on the drive from Spain to France

Thanks in advance

 

[Kannon Fodda]

Is the shunt wired correctly, i.e the battery is on the correct terminal of the shunt and load on other?

 

[steveswift]

Hi kannon. No idea , it’s all beyond me hence why I paid a ‘specialist’ ? To supply and fit , they are closed till 4Th jan so until then I won’t know , dc to dc barely turns on! Solar works great though but now I’m out of Spain that won’t work too well

 

[jumar]

Since changing to Lithium I given up on believing my Shunt and rely on the battery BMS... isn't that something you could do steveswift ?

 

[Ditcha]

Hi there , I wonder if any one can shed any light on the following , I have 2 lithium batteries and a victron set up dc to dc etc ,
It’s behaving oddly , when driving with power off large with power of 15-17a are being drawn , when sitting with power on , lights and tv much less is being drawn 3-5a , somthing doesn’t seem right.

Please see attached 2 screen shots of shunt info .. one whilst driving with power off , and one sat with power on and just bedroom light on.

Is it normal that’s it’s drawing so much power whilst off ?

Many thanks in advance

The one showing 90% is whilst driving from Spain to France

The one showing 72% is after reaching france.

18% has gone somewhere on the drive from Spain to France

Thanks in advance

How did it behave on the way down to Spain? If it was fine on the way down then something has changed it looks as if your b2b is not putting in a charge may be a fuse has blown and the 15amp discharge is your fridge when driving.
If you are heading home and not confident to diagnose the problem until you get home try turning the fridge off when traveling this might help decrease the drain significantly.

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[steveswift]

Since changing to Lithium I given up on believing my Shunt and rely on the battery BMS... isn't that something you could do steveswift ?

I don’t know what the bms is ? Not sure I have one

 

[Lenny HB]

Since changing to Lithium I given up on believing my Shunt and rely on the battery BMS... isn't that something you could do steveswift ?

But the shunt will be far more accurate if you work out the SOC by the current used.

I don’t know what the bms is ? Not sure I have one

Battery Management System, it is built into the battery all Lithium batteries have them.

 

[Lenny HB]

How did it behave on the way down to Spain? If it was fine on the way down then something has changed it looks as if your b2b is not putting in a charge may be a fuse has blown and the 15amp discharge is your fridge when driving.
If you are heading home and not confident to diagnose the problem until you get home try turning the fridge off when traveling this might help decrease the drain significantly.

I agree it looks like the B2B is not working or has been installed incorrectly.
It's a Brit van so the fridge will only be connected to the starter battery.

 

[steveswift]

But the shunt will be far more accurate if you work out the SOC by the current used.

Battery Management System, it is built into the battery all Lithium batteries have them.

Maybe Lenny , the other guy was saying rely on it , how ? The only thing I’m aware of to rely on is the app , that gives me all info (as per attachments) cheers

 

[steveswift]

I agree it looks like the B2B is not working or has been installed incorrectly.
It's a Brit van so the fridge will only be connected to the starter battery.

Hi fridge is off , on way down to Spain b2b was intermittent , the b2b hasn’t worked properly since set up was fitted , the fitter made some alterations to app and it seemed to work fine , however , within a day it wasn’t working correctly again (when driving the power is off. You are correct if I turn on fridge it will run from starter battery ).. come the 4th the fitter can have it back for further investigation , cheers

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[steveswift]

This is the info I have current and history since set up was installed , maybe gives some more insight for someone

 

[AdrianChen]

How much solar do you have, and is it on a Victron controller?

Ooops yes just seen your screenshots

 

[steveswift]

How much solar do you have, and is it on a Victron controller?

525w and yes on victron , that works very well when there is sun!

 

[ManTheVan]

I wonder if this might be a closed loop problem, as identified by Pausim in this thread

Another quick B2B question...sorry!

Didn’t want to hijack any other threads. I‘m considering upgrading to a LiFePO4 100Ah battery so need to change my EHU charger and install a B2B. If I went to fit a B2B (probably a Sterling BB1230), could I use the existing cabling from the engine battery that terminates in my CB box in the...

www.motorhomefun.co.uk

 

[Ditcha]

Hi there , I wonder if any one can shed any light on the following , I have 2 lithium batteries and a victron set up dc to dc etc ,
It’s behaving oddly , when driving with power off large with power of 15-17a are being drawn , when sitting with power on , lights and tv much less is being drawn 3-5a , somthing doesn’t seem right.

Please see attached 2 screen shots of shunt info .. one whilst driving with power off , and one sat with power on and just bedroom light on.

Is it normal that’s it’s drawing so much power whilst off ?

Many thanks in advance

The one showing 90% is whilst driving from Spain to France

The one showing 72% is after reaching france.

18% has gone somewhere on the drive from Spain to France

Thanks in advance

Have you tried running your engine with the fridge on then off to see if you have any change in the current draw?

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[AdrianChen]

Does the shunt report a current that makes sense with what the solar is pushing out? (Idealy compared with as little 12v users switched on)

If so the shunt is wired correctly.

Next I would disable the solar and start the engine to see if the B2B and shunt agree

 

[Lenny HB]

Regardless of what the B2B is doing something is drawing a high current from the leisure battery when the engine is running.
Is there an inverter running powering the fridge at 230v ? Without seeing the van and being able to take measurements it's just guesswork.

Even if the installer had not disconnected the split charge relay all that would do is short out the B2B so you wouldn't get the higher charge rate. If the B2B has been wired just to work from voltage sensing the problems you get from that is more lightly to lower the starter battery and keep the leisure battery topped up.

 

[AgeingAndrew]

I think there are a few things you can investigate here:
1. Has the split charge relay been bypassed ? You could use a voltmeter to check voltages of both the cab battery and LB with the engine off and then with the engine on to verify.
2. How is the B2B configured, in particular the engine detection setup parameters. There is a good description of how to configure the B2B at Engine-on-detection-set-up-Orion-Tr-Smart-DC-DC-Charger-EN.pdf
3. Do you have a smart alternator fitted?
4. What does the B2B show on VictronConnect ?

In my opinion, if your alternator is not switching the B2B on whilst driving AND the B2B is bypassed by the split charge relay then your cab lights,ac etc could be depleting your lb while driving.

Just my opinion.