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BTMS R1

The Grayson BTMS R1 is a rail-approved battery thermal management system engineered to protect and optimise lithium-ion batteries in rolling stock applications. Designed to meet stringent rail standards, the system provides active cooling and heating to maintain stable battery temperatures, supporting maximum performance, service life and reliability across passenger, freight and tram platforms.

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Overview

The BTMS R1 has been developed specifically for the rail sector, where battery reliability, compliance and lifecycle cost are critical.

Using active refrigerant-based cooling and heating, the system precisely regulates battery temperature during operation and charging. A high-performance scroll compressor and plated heat exchanger interface with the battery water-glycol circuit to maintain stable coolant temperatures across wide ambient conditions.

The compact design supports underframe, depending on packaging and cooling requirements. Designed, validated and homologated to meet key rolling stock standards, the BTMS R1 is supplied pre-charged for plug-and-play installation, reducing installation time and cost while ensuring consistent, compliant performance throughout service life.

Features

Explore the innovative features that set our thermal systems apart, delivering consistent efficiency and dependable performance in every application.

  • Rail-Approved Design: Meets stringent rolling stock compliance, validation and homologation requirements.
  • Active Cooling and Heating: Maintains optimum battery temperature across operation, charging and ambient extremes.
  • Compact Underframe Architecture: Supports space-constrained rail vehicle packaging requirements.
  • High-Performance Refrigerant System: Scroll compressor and plated heat exchanger ensure efficient heat transfer.
  • Pre-Charged, Plug-and-Play Delivery: Reduces installation complexity and eliminates the need for on-site F-gas handling.
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  • CAN Communication: Enables seamless integration with vehicle control and diagnostics systems.
  • Brushless Components: Long-life fans and pumps support reliability and reduced maintenance.
  • Bespoke Configuration Capability: Temperature set-points, CAN addressing and system behaviour tailored to each application.
Technical

Designed with precision engineering, each component is optimised to deliver efficiency, durability, and compliance with industry standards.

  • Cooling capacity: 8 kW @ 20°C coolant temperature
  • Heating capacity: 8 kW
  • Operating temperature range: –25°C to +45°C
  • Coolant flow: 60 L/min @ 0.5 bar(g)
  • Coolant type: Water-glycol
  • Refrigerant: R134a (4.0 kg charge)
  • Communication: CANopen
  • High voltage supply: 400 V AC (3-phase)
  • Low voltage supply: 24 V DC
  • Dimensions (L × W × D): 1996 × 820 × 490 mm
  • Weight: 195 kg
Model Variations

Our product range includes multiple model variations, giving you the flexibility to choose the ideal fit for your vehicle and operational requirements.

  • 3A-6725-0A00 - 600V DC: Active Cooling, Passive Cooling and Heating
  • 3A-6725-0B00 - 600V DC: Active Cooling and Passive Cooling Only
  • 3A-6725-0C00 - 600V DC: Active Cooling and Heating
  • 3A-6725-0D00 - 600V DC: Active Cooling Only

*Contact Grayson today to learn more about 900V DC options

Cooling Capacity

8kW Active Cooling

Maintains stable battery temperatures during operation and charging.
Voltage Supply

400V AC / 24V DC

High-voltage supply for thermal components with low-voltage control architecture.
Heating Capacity

8kW Integrated Heating

Protects batteries in low ambient rail environments.
Mounting

Underframe

Compact design suitable for underframe installation.
Download full specification sheet
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Compatible Applications

Product Benefits​

Discover why the world’s bus and coach OEMs choose the FH2 Heater to deliver reliable cabin comfort.

Extended Battery Life

Stable temperature control reduces degradation and supports long-term battery performance.

Rail-Ready by Design

Validated to key rail standards, simplifying approval and integration.

Reduced Installation Cost

Pre-charged delivery eliminates F-gas installation requirements.

Reliable, Low-Maintenance Operation

Brushless components and robust design support demanding rail duty cycles.

Contact Us

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BTMS product enquiry

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Our Capabilities

Full Lifecycle Support for OEMs

Grayson provides end-to-end engineering, testing, manufacturing and aftersales support to deliver compliant, application-specific thermal management solutions. Learn More

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Discover More About Grayson

With more than 40 years of expertise, Grayson Thermal Systems delivers advanced heating and cooling solutions to vehicle sectors worldwide. We provide professional servicing, maintenance, and technical downloads to help ensure long-term reliability.