I do have a spare one, but only because I did not install it with the new inverter last year. It is on the roundtoit list. Thanks for reminding me of this.
However, I must ask the crew, if I have sealed AGM batts (4) 8D's do I need the thermal sensor ? I guess I have procrastinated in asking this question as well.
Even AGM's will heat up like LA batt's. The sensor is needed to tell the charger when to stop bulk charging and switch to float.
It's a way to keep batt's from gassing.
The sensor should be mounted at the furthest battery.