@terziyski Found it. There is a switch that controls heater that warms a pipe that delivers water from the lake to the house so it doesn't freeze in the winter. It is not in an obvious location but...

@terziyski Thank you for the reponse. I didn't think it made sense but I have not been successful tracing the power useage, which began at the same time I installed the AX50. I'll figure it out...

My Archer AX50 uses a relatively large amount of power - 10 kWh per day when house is not occupied and the only active device is the fiberoptic internet and wifi. Does this make sense?