I wouldn’t put the cause on 240V detection per se. I have 12 240V devices in my house and Sense (somewhat) reliably detects 4-8 of them, and have seen Sense detect 8 of them.
- Dryer heating element - detected
- Oven heating element - detected
- AC upstairs and downstairs compressors - both detected. More on that here:
Sense vs. Ecobee: Round II - #6 by kevin1 - Tesla Model 3 - intermittently detected. Sense loses every time Tesla updates firmware
- Tesla Model S - detected once upon a time. Was very special “hacked model” haven’t seen detection in months.
- 2 outdoor heaters - never detected but hardly ever turned on
- 4 in-floor heating wires - Installed one month ago. Sense spotted two of them where I had the thermostat set incorrectly (heating during the summer time ?). I believe Sense will find all of these fairly reliably based on early evidence.