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I believe the issue to this has now been fully uncovered. Taking the information input provided and reaching out to Magnum, I believe the culprit is this.
I had replaced my Magnum ME2012 with a MS28212 to utilize the increased watt/power capacity, and had it installed by an RV tech. It turns out they did a clean drop in and replace. Magnum said that the gauge of wire required for the MS28212 is bigger than the cable used for the ME2012. In hindsight that makes perfect sense. Because the gauge of wire was the old/smaller gauge, the true increased capacity of my new MS2812 was not being realized. The increased resistance over the smaller/older cables DURING (cold weather) PEAK USAGE was generating an increased resistance and popping the 30 Amp input breaker.
The sad part about this is that I now have to replace/upgrade all of the wires from the coach batteries over into the power box involved with inputs and outputs to the inverter. I'm told it's going to be about 30 feet of 4/0 gauge wire. That's not cheap stuff. Oh well. Add it to the list. It's all good.
Going forward, now I know that in very cold weather, with many things running, like a floor heater or the fireplace and heat pump, I need to turn things off prior to cooking with induction and/or microwave/convection.
Live and learn. Thanks for everyones input on this!!
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