Random thought:
The serial port of the Trimetric monitor outputs battery voltage, current, computed SOC and a second voltage (e.g., chassis voltage), among other things. It would be a fairly trivial Arduino project to automate the monitoring and control of the isolation relay in any way that you see fit. If you are not into Arduinos, some kid down the street is.
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Now: 2022 Fully-custom buildout (Ford Transit EcoBoost AWD)
Formerly: 2005 Airstream Interstate (Sprinter 2500 T1N)
2014 Great West Vans Legend SE (Sprinter 3500 NCV3 I4)
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