Could I take a feed from here for DC to DC charger

[Eddie Sutherland]

I have this lot under passenger seat of new van week old and I am pondering if I can feed DC to DC charger from here for lithium aux battery. I haven’t had a chance to get meter out and poke around yet. I am still yet to figure out what it feeds also. (Updated to state correct tech being used)

 

[Ads_Essex]

I have this lot under passenger seat of new van week old and I am pondering if I can feed split charger from here for lithium aux battery. I haven’t had a chance to get meter out and poke around yet. I am still yet to figure out what it feeds also.

View attachment 265587View attachment 265586

That chunky red cable in the second photo looks like the factory fit aux battery cable that is fed from the e-box.

In my T6 I used mine to feed my Ring RSDC50 without issue. It was fused at SA8 with a 50a midi and only fed the dash cigarette lighter sockets.

However, yours may feed some bits already - do you have a second battery, tow-bar module, or any other extras?
Is your relay 645 for a VSR?

 

[Eddie Sutherland]

The only extras I have bud are business pack and front and rear parking sensors. I think that’s what the fuse maybe feeding. I can’t even find the bloody build sticker to see what’s been installed

 

[roadtripper]

The only extras I have bud are business pack and front and rear parking sensors. I think that’s what the fuse maybe feeding. I can’t even find the bloody build sticker to see what’s been installed

As you have VIP Membership drop @Pauly a DM and he can usually get you the full build spec from your VIN when he gets a moment?

 

[roadtripper]

Also are you a T6.1 or T6 - there are significant differences in the electrics in places - yours looked T6.1 like mine from the location of that fuse strip?

 

[Eddie Sutherland]

Also are you a T6.1 or T6 - there are significant differences in the electrics in places - yours looked T6.1 like mine from the location of that fuse strip?

T6.1 now picked it up last week restarting the modding, I have dropped pauly a message thanks.

 

[Skyliner33]

You shouldn’t use a split charger to charge a lithium battery.

 

[Eddie Sutherland]

You shouldn’t use a split charger to charge a lithium battery.

My split charger has a lithium profile as well as a standard and AGM. This is selected on install.

My install on the T6 - 138 amp hour battery with BMS.

 

[Skyliner33]

My split charger has a lithium profile as well as a standard and AGM. This is selected on install.

My install on the T6 - 138 amp hour battery with BMS.
View attachment 265827View attachment 265828

That’s not a split charge relay.

 

[Eddie Sutherland]

That’s not a split charge relay.

That’s not a split charge relay.

I didn’t say it was bud as asked if I could use this supply for my split charger but should have said DC to DC charger to be clearer. (Original post updated to reflect DC to DC charger)

 

[Skyliner33]

I didn’t say it was bud as asked if I could use this supply for my split charger but should have said DC to DC charger to be clearer. (Original post updated to reflect DC to DC charger)

You did, a split charger is a split charge relay.
Dc to dc charger is correct.

 

[StratosFearXX]

I have this lot under passenger seat of new van week old and I am pondering if I can feed DC to DC charger from here for lithium aux battery. I haven’t had a chance to get meter out and poke around yet. I am still yet to figure out what it feeds also. (Updated to state correct tech being used)

View attachment 265587View attachment 265586

Hey @Eddie Sutherland did you use those chunky wires in the end, I have the same I think.

 

[roadtripper]

If it's the same feed as in my MY21 T6.1 Caravelle it's the feed that provides most of the power to the trailer electrics module (4 x 30A) - I think it's a 10mm2 one but check the wiring diagrams before you trust my memory on that.

I think if you were looking to add a modest DC-DC (like the CTEK pictured) you'd be fine, something in the 20-30A region.

If you're looking to seriously invest in capacity and run a 50A region charger I'd get a dedicated feed put in.

if I ever do it my plan is to divert the nominal 30A charge feed from the trailer module through an Orion XS limited to about 20A

 

[StratosFearXX]

If it's the same feed as in my MY21 T6.1 Caravelle it's the feed that provides most of the power to the trailer electrics module (4 x 30A) - I think it's a 10mm2 one but check the wiring diagrams before you trust my memory on that.

I think if you were looking to add a modest DC-DC (like the CTEK pictured) you'd be fine, something in the 20-30A region.

If you're looking to seriously invest in capacity and run a 50A region charger I'd get a dedicated feed put in.

if I ever do it my plan is to divert the nominal 30A charge feed from the trailer module through an Orion XS limited to about 20A

Much appreciated, was thinking of the little Victron 18amp one. Will try and decipher the wiring diagrams before I do anything drastic.

My power needs are quite modest so the 18amp jobbie would be plenty.

 

[roadtripper]

Yep the 18A Victron is a good choice here too.

 

[roadtripper]

You might also be interested in this thread:

Post in thread 'Ignition Live under passenger seat (30 amp) ANOTHER WAY TO DO IT!!!'

22 Mar 2024

This is something I've been investigating too, just not going to tamper until the end of the factory warranty this summer.

I would be cautious pulling a sustained 30amp given discussions elsewhere about cable sizing. You're in a better place underseat than back at the tow socket which was the concern from my 12v EHU approach but even so I'd suggest running at about 20amp if using DC-DC.

Trailers are an infrequent load this would be in use all the time if used for charging. I think also that while the T6 trailer module has an explicit relay for switching this line the T6.1 is done in the...

• roadtripper

• 

 

[StratosFearXX]

You might also be interested in this thread:

Post in thread 'Ignition Live under passenger seat (30 amp) ANOTHER WAY TO DO IT!!!'

22 Mar 2024

This is something I've been investigating too, just not going to tamper until the end of the factory warranty this summer.

I would be cautious pulling a sustained 30amp given discussions elsewhere about cable sizing. You're in a better place underseat than back at the tow socket which was the concern from my 12v EHU approach but even so I'd suggest running at about 20amp if using DC-DC.

Trailers are an infrequent load this would be in use all the time if used for charging. I think also that while the T6 trailer module has an explicit relay for switching this line the T6.1 is done in the...

• roadtripper

• 

Ah, hmm, thank you. That's all a little beyond my pay grade but has filled in some knowledge holes.