Balmar 6m Battery Temperature Sensor

Extended-Reach Thermal Monitoring for Alternator Charging Systems

Accurate thermal management is a fundamental requirement for high-output charging setups in marine vessels, off-grid vehicles, and commercial power systems. The Balmar 6m Battery Temperature Sensor (SKU: B-MC-TS-B) provides precise, real-time temperature data directly from your battery bank to a compatible voltage regulator. By tracking the thermal state of your batteries during charging cycles, this sensor enables your regulator to dynamically adjust voltage output, ensuring both charging efficiency and system safety.

Why Battery Temperature Sensing Matters

Battery chemistry is highly sensitive to ambient and internal temperatures. As a battery charges, internal resistance generates heat. If a charging system continues to deliver high voltage to an overheating battery, it accelerates grid corrosion, causes electrolyte gassing in lead-acid cells, and risks severe thermal runaway. Conversely, a cold battery requires slightly higher charge voltages to accept current efficiently and reach a full state of charge.

Integrating a dedicated temperature sensor solves these problems by facilitating automated temperature-compensated charging. When connected to a compatible external alternator regulator, the sensor acts as a critical safeguard. It prompts the regulator to reduce charging voltage as temperatures rise, or disconnect the alternator field entirely if critical thermal thresholds are reached. For lithium (LiFePO4) battery banks, regulators with a low-temperature limit, such as the Balmar MC-618, can also use this sensor to stop charging below a set minimum battery temperature. Note that the Balmar MC-624 cannot block low-temperature charging.

Engineered for Complex and Larger Installations

Standard sensor leads often fall short in larger boats, motorhomes, or custom dual-cab setups where the battery bank is located far from the engine bay and alternator regulator. Featuring a generous 6m (20ft) cable, this sensor allows for clean, professional routing through bulkheads, conduits, and cable trays without the need to splice or extend wires. Avoiding custom wire splices reduces the risk of voltage drop, signal resistance, and corrosion at join points, ensuring the regulator receives accurate resistance readings.

Key Features

• Extended 6m (20ft) Cable: Provides ample length for routing between engine compartments and distant battery banks in larger marine vessels and RVs.
• Precision Thermal Monitoring: Delivers continuous temperature feedback to compatible Balmar voltage regulators for dynamic charge voltage compensation.
• Over-Temperature Protection: Helps prevent battery boiling, premature capacity loss, and thermal runaway by enabling high-temperature charge reduction or shutdown.
• Ready to Connect: Ring terminal for the battery negative post and spade connectors for the regulator's battery temperature terminals.

Reliable Protection for Your Energy Investment

Deep-cycle battery banks represent a significant financial investment in any off-grid or marine electrical system. Relying on uncompensated charging or splicing shorter sensor leads introduces unnecessary risk to your power storage. This purpose-built sensor ensures signal integrity over long cable runs, giving you confidence that your alternator charging system is operating within safe thermal parameters.

Upgrade Your Charging System Safety

Protect your battery bank from thermal damage and optimise your alternator charging performance. Add the Balmar 6m Battery Temperature Sensor to your system configuration today for reliable, long-reach temperature monitoring.