Xantrex Battery Temperature Sensor (BTS) f/Freedom SW Series

The Xantrex Battery Temperature Sensor (BTS) for Freedom SW Series is a precision marine charging system component designed to optimize battery charging performance across varying water temperatures. This external temperature sensor mounts directly on a battery terminal post or battery side wall and communicates real-time temperature data to your onboard charger or charge controller, enabling automatic voltage compensation based on ambient battery conditions.

Temperature-compensated charging is critical in marine applications where battery banks experience significant temperature swings—from cold early-morning departures to heat buildup in sealed battery compartments during extended offshore runs. The BTS ensures your Freedom SW Series charger adjusts voltage appropriately: lower voltage in cold conditions to prevent overcharging, higher voltage in warm conditions to maximize full charge. This precision extends battery lifespan and improves charge acceptance, particularly important for expensive lithium or advanced lead-acid batteries relied upon for navigation, electronics, and engine starting in remote waters.

This sensor is engineered for weekend anglers running small battery systems and serious offshore operators managing large dual or multi-bank installations. Any vessel with a Freedom SW Series charger and batteries exposed to temperature fluctuations—whether in hot tropical climates, cold northern waters, or variable coastal conditions—benefits from active temperature monitoring. The compact 2 x 2 x 5-inch form factor integrates seamlessly into existing battery enclosures and charging systems without requiring extensive rewiring or modifications.

Xantrex is the marine industry standard for intelligent charging and power conversion, and the Freedom SW Series represents their dedicated lineup for sailboat and recreational vessel applications where reliability and efficiency directly impact time on the water.