EF-003
96S–270S 400A High-Voltage Smart BMS for eVTOL and Heavy-Lift UAVs
Supports: PX4 / ArduPilot / DroneCAN (UAVCAN) / MODBUS / Smart Charger Protocols
The EF-003 is a high-voltage smart battery management system designed for eVTOL, heavy-lift UAV and industrial aerial platforms.
It supports 96S–270S battery configurations, a system-voltage range of 355.2–999 V, up to 400 A continuous operating current and up to eight parallel battery packs.
The system integrates master–slave relay control, insulation resistance monitoring, contactor adhesion detection, multi-channel temperature monitoring, battery-heating control and isolated communication interfaces.
Supports 8 Parallel Battery Packs
For UAV battery systems
400A Continuous Current
For high-power drone applications
600A Peak Output
Ensures stable UAV flight under heavy load
Dual Communication Interfaces
CAN2.0B + Isolated UART for drone BMS integration
Product Introduction
The EF-003 is a high-voltage smart battery management system designed for eVTOL, heavy-lift UAV and industrial aerial battery systems.
It supports configurable 96S–270S battery packs with a system-voltage range of 355.2–999 V and a continuous operating current of up to 400 A.
The system uses a master–slave relay-control architecture for cell-voltage acquisition, total-pack voltage monitoring, current sensing, temperature monitoring, contactor control and fault detection.
For high-voltage battery-system safety, the EF-003 supports insulation resistance monitoring and contactor adhesion detection. Battery-heating control and multi-channel temperature sensing are also available for low-temperature operating environments.
The EF-003 can support up to eight parallel battery packs, making it suitable for high-power UAV and eVTOL platforms requiring scalable battery-system integration.
Key Specifications
| Cell Voltage Channels: | ≥192 channels |
| Single-Cell Voltage Range: | 0-5 V |
| Single-Cell Voltage Accuracy: | ≤20 mV error,≤ 10 mV resolution |
| System Voltage Range: | 355.2–999 V |
| Total Voltage Accuracy: | ≤5 V error,≤ 1 V resolution |
| Current Sensing: | Dual-channel, 0 – 350 A |
| Current Accuracy: | ≤ 3% · ≤ 1 A resolution |
| Temperature Channels: | 16 × PT1000 sensors |
| Temperature Range: | –40 °C to 300 °C |
| Temperature Accuracy: | ≤ 5% · ≥ 1 °C resolution |
| Relay Outputs: | 4-channel, 24 V control, 3 A peak |
| Adhesion Detection: | 4-channel (2× main contactor + 2× pre-charge) |
| Supply Voltage: | 12 V – 36 V DC |
| Steady-State Power: | ≤ 15 W |
| Isolation: | Acquisition ↔ data bus fully electrically isolated |
| SOC Accuracy: | ≤ 5% |
EF-003 Technical Architecture
Engineering Capabilities
High-Voltage Battery-System Integration
Designed for 96S–270S battery packs with a system-voltage range of 355.2–999 V and up to 400 A continuous operating current.
Master–Slave Relay
Control
Uses a master–slave relay-control architecture for scalable high-voltage battery monitoring, contactor control and fault management.
Insulation and Contactor Monitoring
Supports insulation resistance monitoring and contactor adhesion detection for high-voltage battery-system integration.
Parallel-Pack
Scalability
Supports up to eight parallel battery packs for high-power eVTOL and heavy-lift UAV applications.
Advanced Technical Capability
The final configuration should be selected according to the battery-pack series count, maximum charging voltage and application requirements.
The supported measurement range is −40 to +300°C. The final sensor configuration should be confirmed according to the battery-system architecture and application requirements.
Heating voltage, channel count, activation thresholds and release thresholds are configured according to the selected battery-pack architecture and operating requirements.
Baud rates, device addressing and protocol mapping should be confirmed according to the selected project configuration.
The final relay-control configuration should be confirmed according to the battery-system architecture.
Industry Experience
Clients Served
Countries Covered
Technical Specifications
Measurement Precision & Sensing Accuracy
All ADC acquisition modules and peripheral circuits verified to meet AYAATECH 192S BMS precision specifications-industrial-grade accuracy for high-voltage drone and energy storage applications.
| Category | Parameter | Specification |
|---|---|---|
| Cell Voltage | Error | <= 20mV |
| Resolution | <= 10mV | |
| Range | 0 - 5V per cell | |
| Total Voltage | Error | <= 5V |
| Resolution | <= 1V | |
| System Voltage Range | 355.2–999 V | |
| Current | Accuracy | <= 3% |
| Resolution | <= 1A | |
| Range | 0 - 350 A | |
| Temperature | Accuracy | <= 5% |
| Resolution | ≥ 1°C | |
| Range | -40°C to +300°C | |
| Sensor | PT1000 RTD | |
| SOC | Estimation Error | <= 5% |
Test Video
This is a test video embedded from YouTube. Watch it to learn more.
PC & MOBILE SOFTWARE
AYAA software tool is developed by our company for our intelligent protection board series. The user interface allows the user to perform various operations such as monitoring battery data, modifying BMS parameters and many other functions. The UI is divided into four sections, which are, Battery information, parameter setting, calibration and others.
Key Features
Engineered for reliability, safety, and high-performance UAV operations
Master–Slave Relay-Control Architecture
Supports scalable high-voltage battery-system integration through a configurable master–slave architecture.
High-Voltage System Monitoring
Designed for 96S–270S battery packs with a system-voltage range of 355.2–999 V.
400 A Continuous
Operation
Supports up to 400 A continuous operating current for demanding eVTOL and heavy-lift UAV applications.
Parallel-Pack
Support
Supports up to eight parallel battery packs for scalable high-power battery-system configurations.
Contactor Adhesion Detection
Monitors main contactors and pre-charge circuits to support fault detection and relay-control diagnostics.
Insulation Resistance Monitoring
Continuously monitors insulation resistance between the high-voltage circuit and chassis ground.
Multi-Channel PT1000 Temperature Monitoring
Supports multi-channel PT1000 temperature sensing for high-voltage battery-pack thermal monitoring.
Battery-Heating
Control
Supports multi-channel battery-heating control for low-temperature operating environments.
Applications
Powering a wide range of UAV and aerial system applications
eVTOL Battery Systems
High-voltage battery management for electric vertical take-off and landing aircraft.
Heavy-Lift Cargo UAVs
Scalable battery-system integration for UAV platforms carrying heavy payloads under demanding load conditions.
Industrial Logistics Drones
High-voltage battery monitoring and relay control for industrial cargo and logistics UAV platforms.
Urban Air Mobility Platforms
Master–slave high-voltage battery management for advanced aerial mobility systems.
Large Autonomous Aerial Platforms
Insulation monitoring, contactor control and fault reporting for large autonomous UAV battery systems.
High-Voltage UAV Power Systems
Configurable BMS integration for project-specific high-voltage UAV and electric-aircraft battery packs.
Real-World UAV BMS Case Study
Proven UAV BMS performance in real-world drone applications, from heavy-lift operations to extreme environments.
Heavy-Lift Agricultural Drone (30kg Payload)
A professional agricultural UAV platform required a high-current UAV BMS to support long-duration spraying missions under heavy load conditions.
- Battery Configuration: 24S Lithium Battery Pack
- Continuous Discharge: 280 A+
- Peak Load: 450 A during takeoff
- Flight Duration: Increased by 18%
By integrating this drone battery management system, the UAV achieved stable voltage output, eliminated sudden power drops, and ensured consistent performance during critical operations.
Industrial Inspection Drone (High Altitude Operation)
An industrial drone system operating in high-altitude environments required a reliable UAV battery management system to maintain stable performance under extreme conditions.
- Battery Type: Li-ion / Semi-solid battery
- System Voltage: 28S Configuration
- Operating Condition: Low temperature / high altitude
- Result: Stable voltage throughout the entire mission with no drops.
This drone BMS ensured reliable communication via UAVCAN and delivered consistent power output throughout the entire operation.
Need a High-Voltage BMS for Your eVTOL or Heavy-Lift UAV Battery System?
Designed for high-current UAV systems, ensuring stable and uninterrupted power in every mission.
Send us your battery-pack configuration and system requirements.Our engineering team will recommend a suitable EF-003 configuration.
- 96S–270S Battery Packs
- 355.2–999 V System Voltage
- 400 A Continuous Operating Current
- Up to 8 Parallel Battery Packs
- Master–Slave Relay Control
- Insulation Monitoring
Request Technical Proposal
UAV Power Engineers respond within 12 hours