Received the below last night from George Cepynsky of Precision Circuits re my question:
"The Power Control System in the DRV does NOT perform shedding at 50A service. It should display "50A" and the Amp Display should go blank.
Below is the link to our site and the operational manual
http://www.precisioncircuitsinc.com/...em-Mini-D1.pdf
George"