A second temperature sensor can be added to the WiFi i2c connector, it will show up as Temp 4. It is a different bus so it used the default ID. It provides a value only. Only Temperature 2 on the safety controller i2c bus is used by the safety controller to throttle and shutdown.
Additional code or automation from something like Home Assistant would be needed to take action on Temp 4.
Martin Lomas
At the moment, only one I2C temperature sensor appears to be supported:
"Temp 2 is from a temp sensor on newer displays MCP9808"
Can a second MCP9808 be used?
(Multiple MCP9808 sensors can be set to a different I2C address...)
My use is to have one temperature sensor on the contactor relay to detect any overheating on the contacts, and a second sensor on the top inside of the case to warn of external heating from such as the sun.
Thanks,
Martin