Question Isolating coach batteries from house batteries.

[Too Little Too Late]

I called freightliner some time ago and asked them about alternator failures, in particular related to lithium house batteries and they had not heard of any issues.
So I do tend to agree that these are pretty tough units. And to be honest, I have not seen the lithiums pull more than 100 amps across (per the shunt).

While experimenting and trying to get the lithium to play well with others in my coach, I unplugged the combiner and attached the alternator lead to the 460Ah lithium. I started the thing and measured 135 amps from the 170 amp alternator.

 

[Richpatty]

While experimenting and trying to get the lithium to play well with others in my coach, I unplugged the combiner and attached the alternator lead to the 460Ah lithium. I started the thing and measured 135 amps from the 170 amp alternator.

Good data! Something to watch.

I have an all electric rig which came with a 240 amp alternator which gives me a bit more breathing room.

Rich

 

[Trav_lr]

I have a BIM from Precision Circuits installed with FLA chassis batteries and LiFePO4 house batteries. No issues in 3 years

 

[Wemustrv]

My issue is, while traveling we usually run the generator to keep the ACs ahead of the heat, so the inverter is able to charge the house bank. I didn't want the alternator trying to join in and possibly have an issue with two charge/ battery type systems not playing well together. I'm going to install another disconnect to be able to keep them isolated unless needed at some point.

With the generator running the transfer switch directs power from the strongest source to the system so this cannot happen. I would also say that the alternator and the charging system sense when the charge level is correct and stop current flow to batteries. Dual source charging is still parallel 12 volt so it would not hurt the system if they were both properly wired.

 

[Too Little Too Late]

I have a BIM from Precision Circuits installed with FLA chassis batteries and LiFePO4 house batteries. No issues in 3 years
View attachment 29917

Ya know this is the first I've seen the specs on this little green thing. I thought is was a duty cycle timer. Ya can't always believe what YouTube says. Thanks for posting the details on this weird shaped amazing little green box. Takes the place of the isolation relay, and gives back the emergency start switch. Remarkable!