Battery Master and B2B connections.

[jumar]

Currently preparing van for B2B installation...I have been advised on here to disconnect the Starter battery cable as it enters the EBL, this is to disable the Split charger inside.
Well I've noticed that I have a Vanbitz Battery master connected here.....
Can I put the Battery Master elsewhere during my installation..Thanks..

 

[Kannon Fodda]

Vanbitz appear to have wired my battery master across the B2B input and outputs.

 

[autorouter]

Is the plan to disconnect the starter battery cable and not use it (for the B2B or anything else)? If so, you could connect the BatteryMaster to it. It will be a very over-specified cable for the BatteryMaster, but that won't be a problem.

If you are connecting it to the B2B starter battery input, then that's where you can also connect the BatteryMaster.

 

[Lenny HB]

Yes it is to disable the split charge relay.
Which EBL do you have on a lot of them then you can connect via the solar starter battery input on the front panel of the EBL (not on an EBL99). If not just connect it straight to the battery.

 

[jumar]

Yes it is to disable the split charge relay.
Which EBL do you have on a lot of them then you can connect via the solar starter battery input on the front panel of the EBL (not on an EBL99). If not just connect it straight to the battery.

My Hymer has EBL 100... I'm allowing myself to get a little confused as to the best way to connect the Victron B2B..the starter battery is 1.5 metre away from the leisure battery..the EBL is under the passenger seat..2metre away...I have 16mm2 cable to complete the job....mounting the B2B near the EBL is quite challenging......therefore I decided to run a positive cable from the battery...and a short negative from the Leisure battery and mount the B2B next to the leisure battery in a seat box....am I getting close to an efficient set up?
Confused or what?

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[Zigisla]

On my EBL 99, I too have the battery master and all Vanbitz did when they fitted my b2b is remove the fuze from the split charge relay.
My EBL is under the passenger’s seat and my battery and b2b are under the driver’s seat.

 

[jumar]

On my EBL 99, I too have the battery master and all Vanbitz did when they fitted my b2b is remove the fuze from the split charge relay.
My EBL is under the passenger’s seat and my battery and b2b are under the driver’s seat.

Thanks...I need to look at this....I thought that removing the fuse on the EBL disabled the mains charger...I wasn't aware there is a fuse on the Split relay....

 

[jumar]

Further to above..
Got EBL in a better position to see what's happening....on the rear block 1 Engine battery. Red cable.
2 Brown Cables on Negative...one going to Engine battery and one to leisure battery.(Imagine)
3.One black cable to to 50amp fuse connected to Leisure battery...

So....if I disconnect the supply to the EBL that stops the split charger...Red cable and connect it to B2B, then run another a cable to the leisure battery this should work...and of course..an earth to chassis...Got it...

 

[autorouter]

So....if I disconnect the supply to the EBL that stops the split charger...Red cable and connect it to B2B, then run another a cable to the leisure battery this should work...and of course..an earth to chassis...Got it...

Just when you thought you've got it, along comes another suggestion...

Yes, what you said will work, and the leisure battery charging will bypass the EBL. How many amps is the B2B?

The starter battery (red) cable probably has a 50A fuse on it, near the starter battery. If the B2B amps is about 30A or 40A, this cable is OK.

If the B2B is 30A or 40A, then it's possible to wire it slightly differently. Connect the starter battery (red) cable to the B2B as before. Then wire the B2B output to the starter battery input terminal on the EBL (the one you just disconnected the red starter wire from).

What happens is, when the engine starts, the alternator starts sending power to the B2B. the B2B output goes to the EBL, and through the split charge relay to the leisure battery. The split charge relay is on, because the engine is running. The (slight) advantage of this arrangement is that the charging amps also goes through the EBL internal shunt, so it gets measured and accounted for accurately on the display.

If the B2B is higher power like 50A or 60A, then the wiring inside the EBL won't handle it, so you are best sticking with your original plan of wiring straight to the leisure battery.

 

[jumar]

The BtoB is Victron 12/12 30 Amp...
Don't think I will sleep tonight.....Im not the type to jump in...hence the multiple questions.....got the Lithium coming on Tuesday...upgraded all my wiring/fuses...no rush till I'm confident...
Just read your latest method which due to its simplicity ranks very high on what I might do....,,,,

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[jumar]

The BtoB is Victron 12/12 30 Amp...
Don't think I will sleep tonight.....Im not the type to jump in...hence the multiple questions.....got the Lithium coming on Tuesday...upgraded all my wiring/fuses...no rush till I'm confident...
Just read your latest method which due to its simplicity ranks very high on what I might do....,,,,

Installed B2B as per methods advised by autorouter and previously suggested by@ Lenny HB cannot fully test it as I await the arrival of my Lithium Battery tomorrow...then we shall know if all's well... I've replaced and upgraded many cables...bus bars. fuses and isolators...and not forgetting connecting the Inverter to a very meaty pair of cables....had to come inside as the van is now in full sun for a couple of hours and I need to make some space in the apartment fridge, achieved successfully by removing a single can of San Miguel...

 

[jumar]

Well, I completed my installation...all went well.everything works OK except my New Lithium Battery....it failed to arrive...so I refitted the old LA and kept the settings on all the Victron stuff for now until it arrives.. apparently held up in a Custom clearing centre in the UK for past week..."Whats that all about"....

 

[jumar]

Latest, Latest update, my Lithium has....still not arrived, the sellers in the UK are useless with international deliveries....now coming with another carrier...

I have reinstalled my LA to test everything I have updated, added...I put the Battery Master where it was before I fitted the BtoB..wired to the back of the LNB and found the Cab Battery does not change, the Leisure batter is charging via the Solar and the BtoB.....
Looks like I need to wire the Battery Master to the batteries in a different way..
Not using the van until the Lithium arrives.....which I am told will be very soon....only been 3 weeks so far.....they said its Customs clearance problem and blamed a recent event for the delays....actually it was rejected and returned to sender.......the package tracker showed this....

 

[jumar]

Continuing on from my previous posts...lithium finally arrived....installed it and began harvesting Solar to charge it...cranked up the engine after checking all settings on the B2B and MPPT making sure they are set to Lithium...which they are....I am very surprised to see that the B2B is only giving 15 or so amps....nothing near the 30amp it's rated for...I think a few tweaks on the Victron B2B settings may be required...could the EBL be the cause...
On the van control panel it's showing 15amp as is on the Victron smartshunt...both interesting and somewhat confusing....any ideas on offer...?

 

[grasscutter]

I think it will depend on the state of charge of the batteries.
The intelligent side of the B to B will lower the charge the higher the batteries are charged.
Greater minds than mine will hopefully confirm
You could put a heavy load on the batteries and discharge them down a bit and see if the amps increase on the charger.

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[jumar]

I think it will depend on the state of charge of the batteries.
The intelligent side of the B to B will lower the charge the higher the batteries are charged.
Greater minds than mine will hopefully confirm
You could put a heavy load on the batteries and discharge them down a bit and see if the amps increase on the charger.

Even with the new Lithium battery delivered at 47%SOC the B2B wouldn't give more than a normal Alternator output..
The MPPT is giving me about 6 amp this morning...
quite a bright blue sky...
Battery now 81,% charged of its I60Ah capacity...
Had to give up and take a San Miguel..more later...postings...not San Miguel...although the latter presents little problems...,

 

[jumar]

Even with the new Lithium battery delivered at 47%SOC the B2B wouldn't give more than a normal Alternator output..
The MPPT is giving me about 6 amp this morning...
quite a bright blue sky...
Battery now 81,% charged of its I60Ah capacity...
Had to give up and take a San Miguel..more later...postings...not San Miguel...although the latter presents little problems...,

Putting a decent load through my inverter yesterday afternoon increased the B2B output to about 17amp...still not the 30amp that it's rated.
I am beginning to think that the original cable perhaps 10m2 from the EBL to my leisure battery is not big enough to carry the extra current..just a thought...I would guess it's 2metre long also...will load up and head off into the unknown on Sunday...give the system a proper try...and enjoy a Spanish Autumn trip...

 

[Lenny HB]

Putting a decent load through my inverter yesterday afternoon increased the B2B output to about 17amp...still not the 30amp that it's rated.
I am beginning to think that the original cable perhaps 10m2 from the EBL to my leisure battery is not big enough to carry the extra current..just a thought...I would guess it's 2metre long also...will load up and head off into the unknown on Sunday...give the system a proper try...and enjoy a Spanish Autumn trip...

We have had a few PM's but I've been missing updates on this thread. I take it you have wired the B2B via the EBL?
If so the low charge could be due to the relay contacts of the split charge relay carboned up it happens after a few years use.
Hymer normally use 16mm sq for the battery wiring.
Try by-passing the EBL.

 

[jumar]

Sorry Lenny only just picked up on this...
Our van is loaded and ready to roll for its maiden voyage as a lithium charged unit..
Everything working well except above reduction in output from B2B...I will take some 16mm2 with me and if needed I will connect directly from the SB to test the theory.....my solar set up brought the battery up to 100% and I charged Judith's eBike in the shade only taking 10% of the battery capacity..so with solar panels working in the Spanish sunshine we should achieve what we set about doing....,,

 

[jumar]

Initial brief report...Working well...B2B got up to 19.5 amp whilst driving yesterday with two eBike batteries charging..further testing and adjustments needed...so far very pleased..was a cloudy afternoon yesterday and what we managed will enable us to ride this morning..