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Regarding your adding a disconnect of the Lithium batteries at the negative leads near the shunt. I believe you previously commented that you had to check for other wiring connected directly to the batteries. FWIW, my 2023 Tellaro 20k with d2x100ah Relion batts does have additional connections at one of the batteries. A +/- 16 ga black at the negative and similarly red at the positive. In addition there is a temp sensor at the positive. Interestingly, Balmar literature says the sensor should be connected at a negative post near the center of the bank. I believe the red and black go to the regulator terminals 1 and 2 while the sensor goes to terminals 7 and 8. I have yet to confirm the connections at the regulator however. I have to pull the microwave to do so. The Thor electrical diagrams and schematics don't quite get to that much detail when it comes to the Balmar regulator.
Also I contacted Thor a while ago and asked about their statement in the manual and supplement that states "always install a safety relay..." They responded that it wasn't required because it is "the smaller package." Not sure I buy that reasoning. Anyway I'm considering adding a disconnect as you are. I'm just waiting for you to do it so I can follow your lead!!
Happy New Year
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