In no great surprise, the old sump pump that still worked has a readable power plate calling for 9A. Thus the warm extension cord... New pump despite 2x HP does not seem as current hungry.
[edit- while I wasn't paying attention it looks like they started rating motors by HP not current... my old 1/4 HP motor calls out 9A, the new 1/2 HP motor only specs HP, but if I look up current draw for 1/2 HP I get a similar 9A, so 2x power for same current as old school... got to love technology /edit]
I am resisting my inclination to redesign the second water level switch, before it arrives... somebody stop me..
Multiple technologies that look interesting, bouncing ultrasonics signals off the water level, laser distance meter, and perhaps capacitance detection. My old idea of sensing the line cord draw still sounds good for safety shut off... But first things first, lets see how the new level switch looks, due in next week.