Trace BTS
Battery temperature sensor for SW, DR, UX, & TS inverters, and solar controllers. Included standard with the SW-series and M-series inverters. Optional on all other products. The BTS/35 is included standard on all power panel systems.

 
Trace BTS/15 15-foot (5m) cable.
$ 29
Trace BTS/35 35-foot (11m) cable. 
$ 32