Anyone with a Blue Motion with a factory fitted second battery

[rod_vw]

If anyone on the forum has a Blue Motion van with a factory fitted second battery please can you have a look at the cables on the second battery terminals and let us know if it has a monitoring device attached like the one pictured below on the main battery. Pictures would be nice.



Rod

 

[Pauly]

This would be really handy if someone could check for us may answer a few questions we have.

 

[mhill]

I can take a look on Saturday for you, got som much under there it's a case of unbolting the seat to get to it.

 

[rod_vw]

Thanks, that would be very useful.

I guess that you realise that we are trying to establish how the factory additional batteries are charged on a Blue Motion vehicle. It is understood that the normal charging regime does not fully charge the engine battery (to about 80%?) to make allowance for the regenerative braking system. But we don't know how the genuine leisure ones are monitored / charged.

Cheers,

Rod

 

[Loz]

It doesn't matter if you use a D250s as it handles it and takes the battery to 100% and them floats it etc.

 

[rod_vw]

Yes I agree but a Cali' has two leisure batteries (sometimes) (or Special vehicle fitted with a second battery) do not have any 'clever' charging device so...

How do VW do it? Or maybe they don't and the extra batteries are never fully charged!

That's what we are trying to discover.

Rod

 

[Pauly]

We've gone too far to turn back know @Loz
We need to know

 

[Loz]

I have one but only because the Cali has the control panel, my third doesn't

 

[Absolut5]

The factory second battery, which is a AGM has a simple charge set up using a relay under the seat controlled by the BCM, The underbonnet one has a monitor on it as the pic above

 

[travelvolts]

According to a master tech at Listers Van Centre, the charging is all handled by software in the BCM and the Alternator control in the engine ECU. Having said that, it all sounded a bit scripted, kinda like the guy had been on a seminar but didn't really understand the nuts and bolts of it. What we really need is a Cali to play with and study the charging output to the auxiliary batteries.

 

[rod_vw]

Thanks all, this sounds as if it's as far as we can go without someone being able to look into the software implications of activating 'Battery Separation' on the BCM. On that subject I have started a thread on the Ross Tech forum asking very similar questions, this is at Adding leisure battery to a Blue Motion T6

Rod

 

[Loz]

Thanks all, this sounds as if it's as far as we can go without someone being able to look into the software implications of activating 'Battery Separation' on the BCM. On that subject I have started a thread on the Ross Tech forum asking very similar questions, this is at Adding leisure battery to a Blue Motion T6

Rod

Why make it so complicated?
I built a "Battery Pack" that plugged into the Touareg with BM and regenerative and stop start and it worked perfectly with charging up to 20 amps and built in m300 ctek mains charger as a hookup plus takes 2 solar panels.


would it help if I posted up the how to?

 

[rod_vw]

Why make it so complicated?
I built a "Battery Pack" that plugged into the Touareg with BM and regenerative and stop start and it worked perfectly with charging up to 20 amps and built in m300 ctek mains charger as a hookup plus takes 2 solar panels.
View attachment 3538 View attachment 3539 View attachment 3540 View attachment 3541 View attachment 3542

would it help if I posted up the how to?

Sorry, I don't quite understand your question.

I've no wish to decry what you have done but it looks far more complicated and way more expensive than the genuine VW system. By all means post a 'how to' there may be some who wish to follow that route.

Our question is, does the VW system charge additional batteries efficiently? If so then its simplicity is the best option, easier to install, less to go wrong and less expensive.

Rod

 

[Loz]

none taken, I think I was trying to make the point that the d250S works with the systems on the vehicle and will give you a 100% charge.
All you need is a D250s and an AGM battery connected to a spare fuseway in the A fuse box and no messing with BCUs warranty etc.