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

Optimizing your battery charging process starts with precise temperature monitoring, and that's where the Xantrex Battery Temperature Sensor (BTS) shines for Freedom SW Series inverter/chargers. By accurately sensing the battery's actual temperature—whether it's mounted on a terminal post or the side of the battery—this compact device communicates vital data back to your charger or controller. The result? Automatic voltage adjustments that match the ambient conditions, ensuring your batteries receive the ideal charge every time, regardless of whether you're boondocking in freezing winters or baking under summer sun.

Unlock the Full Potential of Temperature-Compensated Charging

Batteries are finicky about temperature. Too cold, and they charge slowly or not at all, risking sulfation and shortened lifespan. Too hot, and overcharging can lead to gassing, electrolyte loss, or even dangerous thermal runaway. The BTS eliminates guesswork by providing real-time temperature feedback over its 25-foot (7.6m) communication cable. This enables your Freedom SW system to dynamically tweak charging voltages—higher in cooler temps for faster charging, lower in heat to prevent damage.

• Precision Charging: Delivers the exact voltage your batteries need for 100% charge capacity.
• Extended Battery Life: Prevents under- or over-charging, common culprits in premature battery failure.
• Seamless Integration: Plugs directly into compatible Freedom SW models without complex wiring.
• Rugged Design: Built for harsh environments like marine, RV, or off-grid solar setups.

How It Works: Simple Science for Superior Performance

Imagine your battery bank as a living thing—it breathes, expands, and contracts with temperature changes. The BTS acts as its smart guardian. Strapped securely to the battery case or post, it measures core temperature with high accuracy (±1°C). This data travels via the included cable to the Freedom SW inverter/charger, which runs proprietary algorithms to adjust bulk, absorption, and float stages. For lead-acid, AGM, or lithium setups (where supported), this means charging curves that follow battery chemistry perfectly, maximizing usable capacity and efficiency.

In real-world scenarios, users report up to 20-30% better charge acceptance in varying climates. Whether you're powering a sailboat's house bank or an RV's deep-cycle batteries during cross-country trips, this sensor keeps things balanced and reliable.

Effortless Installation for DIY Enthusiasts

Setting up the BTS takes minutes, not hours. Here's a quick guide:

1. Clean the battery terminal or side surface for solid contact.
2. Secure the sensor using its built-in strap or adhesive—ensure good thermal coupling without obstructing terminals.
3. Route the 25-foot cable neatly, avoiding heat sources or pinch points.
4. Plug into the dedicated BTS port on your Freedom SW unit.
5. Power cycle the system; it auto-detects and activates compensation.

No special tools required, and it's reversible for easy relocation. Pro tip: In multi-battery banks, place it on the hottest or most representative battery to capture the bank's average temp accurately.

Perfect Match for Freedom SW Series

Designed exclusively for seamless pairing with Freedom SW models, including the 2000, 3000, 2000 24V, and 3000 24V inverter/chargers. These powerhouse units handle demanding loads while prioritizing battery health, and the BTS elevates their performance. If you're running solar arrays, generators, or shore power, this sensor ensures every electron counts toward longer runtime and fewer replacements.

Why Every Serious Setup Needs Temperature Awareness

In off-grid living, RV adventures, or marine voyages, battery reliability is non-negotiable. Without temp compensation, generic chargers guess at voltages based on air temp, often miles off from the battery's reality inside an engine bay or battery box. The Xantrex BTS bridges that gap, turning potential headaches into hassle-free power. Owners love how it quietly prevents issues like stratification in flooded batteries or voltage sag in cold cranking amps scenarios. It's not just an accessory—it's insurance for your power system.