Schaudt EBL271 and Sterling 60A B2B

[Youlostoo]

Question is, do I need to isolate the starter battery feed to the EBL271 with a relay, if the engine is running?

 

[Stealaway]

No it all seems automatic.
The B2B will charge the engine battery and when that's full it will carry on charging the leisure batteries.
The EBL will know nothing about it if you have followed the Sterling wiring diagram.

 

[Youlostoo]

Stealaway The B2B seems to be working fine, the reason I asked is because in the latest MMM magazine tech advice, they advise fitting a relay to isolate the engine battery on a Bailey, and wondered if it was necessary to do this with my Pilote. I assume with my limited knowledge it could be forming a charging loop.​

 

[autorouter]

On some MHs, there is a single feed from the starter battery, which carries the leisure battery charging current to the split charge relay, but also carries the fridge power and is used for starter battery voltage sensing, and possibly charging by solar, ehu etc. So they need relays etc to maintain functionality if the split charge relay feed is removed.

On EBLs, including the EBL271, there are two separate wires from the starter battery. The one with the 50A fuse is used only for the leisure battery charging via the split charge relay. If you remove that fuse, no power will go via the split charge relay, and all the other functions are on the other wire with the 20A fuse.

 

[ivorantony]

I have a EBL226 with a Sterling 60 amp BtoB charger and have had no issues with them in the last three years, all works as it should,

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[Youlostoo]

autorouter If I remove the 50A fuse for leisure battery charging that would mean there would be no charge to the leisure batteries whatsoever, even on EHU?​

 

[autorouter]

If I remove the 50A fuse for leisure battery charging that would mean there would be no charge to the leisure batteries whatsoever, even on EHU?

There is a 50A fuse on the leisure battery, and also a 50A and 20A fuse near the starter battery. It's the 50A starter battery fuse that I think needs to be removed.

 

[Youlostoo]

autorouter Thanks for the explanation, the advice in MMM makes sense now.​

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[paddymcc]

I don't know about the EBL 226 but Schaudt advise not using more than 50A through my EBL 101 as the internal wires are only designed to cope with 50A max

 

[Youlostoo]

paddymcc The B2B does not operate through the EBL, it is completely separate. My concern is that the EBL will also be charging the leisure batteries at the same time when the engine is running.​

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[Pausim]

paddymcc The B2B does not operate through the EBL, it is completely separate. My concern is that the EBL will also be charging the leisure batteries at the same time when the engine is running.​

If the B2B output voltage is above the engine battery voltage it will flow the wrong way through the EBL causing a loop. This is why you should do as autorouter says and remove the 50A fuse. Defeats the purpose of having a B2B if you do not disable the original split charge circuit.

 

[Youlostoo]

Thanks for the advice. I removed the 50A fuse F2 pic 1 marked Starter battery, isolating the ebl charge. The fridge now only works on 12v with the engine running, but operates as normal on ehu or gas. The solar controller is also routed through the ebl, would I be better connecting them directly to the batteries?
Really appreciate your help.

 

[autorouter]

The solar controller is also routed through the ebl, would I be better connecting them directly to the batteries?

That route through the EBL is good for about 15A, ie about 200 or even 250W of solar panel. Anything more needs to go direct to the batteries. One of the pins of the 3-way solar connector goes to the starter battery, and is usually only a trickle-charge, so that will be OK to route through the EBL even if the main leisure battery charge has to go direct