Sanity check before I start tracing cables and perform more diagnostics

[pjohn07]

Hi @JamesV . Thank you for your suggestions. I tried lowering the shutdown voltage to 12.9. And for the first 15-20 mins of the truck running, I was getting better (but still not great) results, 12.5V Input to the Orion, 13.6V Output to the Battery. At this time the Battery BMS was reporting 13.5V, 5amps and 70w of charging power. I wasn’t driving, just had the truck parked/idling. However, after 15-20mins, things went downhill. The Victron charger app was reporting Input Voltage as low as 11.0V (but was mostly between 11.5 and 12.3). Strangely, I did not see any messages reporting that the charger was disabled due to voltage lockout (which was set to 12.5 when I started the engine, but I backed down to 12.2 once I saw the voltage drop). I used my clamp meter to take amp readings from the cabling near the starter battery all the way (21 feet away-6 awg) to where it gets to the charger and didn’t notice much difference. I’m baffled.