Question BIM in 2022 LADP?

[redbaron]

WOW! That can be a major problem!

Personally, I would eliminate that from the get go. Paralleling dissimilar battery technology is a really bad idea, especially when lithium is one of the technologies!

It’s only done when one set is dead and you need to get power from the other.

Ie: dead chassis and you need to start coach or generator to charge.

I will use a dc to dc charger to retain the boost feature, and that eliminates any concern over different battery types.

 

[Neal]

I have a Freightliner with 240 amp alternator. I think you can go higher than 30 amp no problem stressing alternator. I’ve seen others install 2 of the 30 amp model in parallel for 60 amp total.

But, look at the new Victron Orion 12/12 50 dc dc charger. A new product released recently that is much more efficient than the older models. I’m thinking of adding this to my setup when I change over to Lithium this summer.

This?

https://www.victronenergy.com/dc-dc-converters/orion-xs-12-12-50a-dc-dc-battery-charger

Sure looks interesting.

 

[Rd1]

I am in the process of replacing batteries in my coach with Lithium, but need to resolve the circuit protection for the alternator.

fwiw, this discussion might interest you, re dc to dc nor special BIM

Maybe switching to Lithium House Batteries - iRV2 Forums

I'm sure thhe info I am looking for has already been addressed in this great form, but I can't find it so: I have a 2018 New Aire and the AGM house batteries need replacing. Am considering going

www.irv2.com

 

[Joe Dutchstar]

Silverleaf system uses programming and a solenoid for BIM function on the 2024 DSDP with the Lion option. Had to replace the original one with a new one under warranty within the first month.
Luckily , the Silverleaf engineer was around so he checked that I had the most recent program installed. There is an update that is fairly recent.

 

[Kevin D Pem]

It’s only done when one set is dead and you need to get power from the other.

Ie: dead chassis and you need to start coach or generator to charge.

I will use a dc to dc charger to retain the boost feature, and that eliminates any concern over different battery types.

Well, not really! It's said a lithium battery acts much the same way a capacitor reacts! It will completely discharge very fast!

I could see modifying the relay system to switch the starting system from one battery to the other. But to introduce a short circuit to a lithium battery is pure suicide!!! Thank God your lithium battery has short circuit protection!!!

 

[redbaron]

fwiw, this discussion might interest you, re dc to dc nor special BIM

Maybe switching to Lithium House Batteries - iRV2 Forums

I'm sure thhe info I am looking for has already been addressed in this great form, but I can't find it so: I have a 2018 New Aire and the AGM house batteries need replacing. Am considering going

www.irv2.com

Thanks…that does help.

 

[redbaron]

Well, not really! It's said a lithium battery acts much the same way a capacitor reacts! It will completely discharge very fast!

I could see modifying the relay system to switch the starting system from one battery to the other. But to introduce a short circuit to a lithium battery is pure suicide!!! Thank God your lithium battery has short circuit protection!!!

And the additional DC to DC charger will also protect against reverse /short

 

[Kevin D Pem]

And the additional DC to DC charger will also protect against reverse /short

We are not even talking about the same circuit!!!
The only time the load circuit touches the charge circuit is at the batteries!!! What the charge circuit offers is independent from, therefore does not apply to the load circuit!!! Diagram it out!!!

 

[redbaron]

I am talking about the house side at the solenoid. Putting a dc to dc there facing the solenoid will prevent reverse flow to the lithium but will allow the lithium to power the solenoid and thus power the chassis battery.

If a short occurs, it’s limited to 50amp before protection kicks in.

 

[Ddmo]

This?

https://www.victronenergy.com/dc-dc-converters/orion-xs-12-12-50a-dc-dc-battery-charger

Sure looks interesting.

Yes. That’s it.

 

[Kevin D Pem]

I am talking about the house side at the solenoid. Putting a dc to dc there facing the solenoid will prevent reverse flow to the lithium but will allow the lithium to power the solenoid and thus power the chassis battery.

If a short occurs, it’s limited to 50amp before protection kicks in.

Clearly we are reading a different book! I'm still talking about using a boost circuit, on the load circuit. Connection from lithium to "weak" agm or other battery, is by definition a short!

 

[redbaron]

So am I.

Boost is what activates the solenoid to provide the functionality.

Using my design would allow this feature to work for boosting the chassis and let it start safely off the lithium house battery.

The existing circuit for charging the house from alternator would have the DC to DC facing the house battery. This provides for the function as originally designed, while offering protection of shorts and ensuring current draw doesn’t exceed 50amp.

If the chassis battery’s are internally shorted or truly dead, then the boost feature is irrelevant and won’t help anyway. But if they are just very low, it will work the way it did prior to lithium.

 

[Richpatty]

Clearly we are reading a different book! I'm still talking about using a boost circuit, on the load circuit. Connection from lithium to "weak" agm or other battery, is by definition a short!

Huh?

 

[Kevin D Pem]

Huh?

A quote!

"

In the context of a battery (or any power source), we usually mean it to be a load that is far too large for the source. Any battery, whether a high voltage or low voltage battery, will be 'short-circuited' by putting a low or zero resistance load on it.

A short circuit usually produces damaging conditions for the battery, and the load, if maintained for enough time. At best, the battery will be run down quickly. At worst, the battery may catch fire, burst itself or its container, or the load start a fire."

 

[redbaron]

Kevin, one of us is clearly confused on the purpose of the DC to DC charger I have mentioned.

I will do some more research because right now I feel pretty confident in my design and intended usage.