MrWizard wrote:
The Fridge battery wire probably goes up front
To a post on one of the solenoids,
It is also possible that it goes directly to the wiring from the converter that leads to the house batteries up front, is your circuit breaker power center in the kitchen area near the fridge, your converter for charging is part of the power center
It is being charged by the converter when the generator is on , or plugged into shore power just like the two house batteries up front,
Most likely the 3rd battery was not installed at the same time as the fridge and inverter, but the voltage drop from the long wiring path (all the way up front) was too much and the inverter would give a low voltage fail when the fridge kicked on, so the third house battery was installed at the fridge to alleviate the problem
All 3 house batteries are parallel, and supply power to fridge and house unless some how disconnected from each other,
The inverter is dedicated to the fridge, but that battery is Not the only one powering the inverter
The blue finned box with battery cables is the diode based battery isolator that charges your batteries from the ALTERNATOR when the engine is running, it keeps the house batteries separated from the chassis/engine battery
Thank you, this helps! Yes from what I recall the previous owner had added the battery at the fridge himself along with the inverter. I never did get the reason, but that makes sense as you describe. The isolator is from Sure Power Industries and below is a pic of the label. Says its meant for 1 Main battery and ! Auxiliary.
I did get a response from Battleborn today I think I need to call them to see if we are all on the same page as I thought I would be okay dropping in the Lithium batteries since I have the isolator in thereI. But I am not a professional. I would love to clean up all the wiring/batteries but there is so much wiring going on besides batteries I don't want to screw things up.
Their response below:
"I had a conversation with my techs here and we went over the system together.
With your current set up, you would need to remove the isolators and BIRD relay from the system to function properly with Battle Born Batteries. After some research on the relay system, it looks like it will always be connected when the batteries are 90% or above, which could lead to issues with overtaxing the alternator, and it staying continually connected even if the engine is turned off.
We also discussed the 3rd battery back in the middle portion of the coach. I think that this battery would need to be moved to the front so that voltage drop can be minimized from the batteries to the inverter.
let me know your thoughts, and we will see what we can do."
