When you say that your Onan generator “abruptly shut down” do you mean it stopped producing power or actually stopped running. If the later then maybe the BMPro losing DC power triggered this.
Overall it sounds like the Relion’s BMS tripped due to low temps and when it warmed up a bit it started supplying power. Was the warm up due to ambient temp increases or was it caused by the Relion’s internal circuits? Not sure.
David
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