Long story short,, I have to use this 150ah battery - it's the only one I can find that fits in the space available. The problem, it does not have low-temp protection in its BMS.
The Battery Protect (BP) is going to cutoff both the charging and the loads for the battery, when the Victron BMV TEMP sensor goes below 40 degrees. The thermal sensor needs 12v to operate and needs to live in the battery compartment. The issue, if the aux battery is completely dead, the Temp-sensor/BMV will never close the BP. Also, the Charge sources needs to feed the load, when the battery is dead.
Remedy, a supply from the Charge sources will be connected to the Temp-sensor/BMV within the battery compartment. And both loads and sources will be place on the "IN" of the BP.
Question, does this all seem like an okay design? Is there an issue running both loads and charging sources from the "IN" on the BP