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400A Smart BMS for Industrial UAV Batteries: Inside a 24S–32S Design

Sep 03, 2026

Industrial UAVs and heavy-lift drones push battery systems harder than almost any other application. High-load missions demand high continuous current, sudden power peaks and absolute reliability — because a power cut in the air is not an inconvenience, it is a safety event. That is why the battery management system (BMS) matters as much as the cells themselves. As a professional lithium battery manufacturer, UFOPOWER designs and builds a 24S–32S 400A smart BMS purpose-made for industrial UAV battery packs, covering high-power, high-voltage platforms with flight-safe protection logic and full protocol integration.

uav battery 1.jpg

What a High-Power UAV BMS Must Handle

A smart BMS for industrial UAV battery packs is responsible for far more than basic protection. It must deliver 400A of continuous discharge for high-load platforms, survive 600A peak demands during aggressive manoeuvres or heavy payloads, and coordinate large-capacity power systems built from multiple packs. It also has to talk to the aircraft: modern UAV control systems expect live battery telemetry — state of charge, cell voltages, temperatures and fault states — over standard protocols, so the BMS becomes part of the flight control ecosystem rather than a standalone safety box.

UFOPOWER's 24S–32S design addresses these demands across an 88.8V–118.4V operating range. It manages lithium packs from 24 to 32 series cells, supplies 400A continuous discharge with 600A peak capability, and coordinates up to eight battery packs in parallel — a configuration that suits large-capacity Li-ion power systems on industrial aircraft, heavy-lift logistics UAVs and eVTOL prototypes.

Core Electrical Specifications

ParameterSpecification
Battery string range24S – 32S
Nominal voltage window88.8V – 118.4V
Continuous output current400A
Peak current capability600A
Parallel pack capacityUp to 8 packs
SOC estimation accuracy±3% after calibration
Temperature inputs4 independent NTC sensors
Board dimensionsL300 × W118 × T14.5 mm
Supported protocolsCAN 2.0B, isolated UART, DroneCAN (UAVCAN), Modbus, smart-charger links

Protection Logic Built Around Flight Safety

A ground vehicle that loses power simply stops. A UAV that loses power falls. This difference drives the protection philosophy of the UFOPOWER design: warning first, cutoff only when the aircraft is safe. The BMS supports flight-mode logic that prioritises warning output and avoids sudden power cutoff while the aircraft is in the air — for example, a pack undervoltage warning does not shut down the discharge MOSFET during flight.

Protection functionHow it works
Overcurrent and short-circuit controlShort-circuit trip at 1,500A with 200µs response time; recovery after load removal
Charge / discharge voltage protectionWarning and cutoff voltages computed from the selected series count; overvoltage disables the charge MOSFET
High- and low-temperature safeguardsFour independent NTC inputs track pack temperature and respond before thermal risk builds up
Flight-mode protectionPrioritises warnings and avoids power loss in the air
Vibration-resistant mechanical layoutLayout engineered for vibration-heavy operating environments
uav battery 2.jpg

Protocol-Ready Integration and Monitoring

Integration flexibility decides how easily a BMS fits into a real UAV programme. This design provides dual isolated data paths — CAN 2.0B and isolated UART — with communication wake-up, plus compatibility with DroneCAN (UAVCAN), Modbus and smart-charger links. That means it works with popular open flight-control ecosystems such as PX4 and ArduPilot, and can hand live state-of-charge, fault and diagnostic data straight to the aircraft control system. An isolated RS485 channel supports Modbus with adjustable baud rate and configurable device IDs from 0 to 255, while optional Bluetooth lets engineers view live battery status and diagnostics from a mobile app. Type-C access, SOC display output and LED indicators can be matched to different UAV pack designs, and a configurable storage-discharge function with idle-time thresholds helps extend battery service life between missions.

Eight-Pack Parallel Power for Demanding Missions

Coordinating up to eight packs in parallel turns a single BMS into the brain of a large-capacity power system. This makes the design a strong fit for the most demanding industrial UAV roles:

  • Heavy-payload logistics UAVs — high-current control for aircraft carrying large loads through demanding missions.

  • Industrial cargo drone fleets — parallel-pack management for longer endurance and strong output.

  • Large UAV and eVTOL platforms — high-voltage pack supervision for prototypes and next-generation designs.

  • Emergency response drones — reliable monitoring under time-critical, high-load profiles.

  • Industrial inspection aircraft — dependable power delivery with live fault feedback.

  • Autonomous high-power aerial systems — scalable management and protocol integration.

Project-Based OEM / ODM Customisation

Every UAV programme is different, and off-the-shelf protection thresholds rarely match a specific airframe's flight envelope. As a professional lithium battery manufacturer, UFOPOWER offers factory-direct OEM/ODM custom battery solutions: pack series count, interfaces, protection thresholds, SOC display logic and even charge-recovery conditions can be adjusted around each UAV programme. In-house production with strict quality control and 100% factory testing ensures every BMS ships ready for vibration-heavy, high-current service.

FAQ

Q1

What does 24S–32S mean in a smart BMS for UAV batteries?

It means the BMS supports lithium battery packs built from 24 to 32 series-connected cells, covering a nominal voltage window of 88.8V–118.4V — typical of high-voltage industrial UAV and heavy-lift drone power systems.

Q2

Why do industrial UAVs need a 400A BMS?

Heavy-lift and high-load UAV missions draw very high continuous current and sudden power peaks. This BMS supplies 400A continuous discharge and handles 600A peak output, so the pack can support demanding flight profiles without tripping protection.

Q3

How does the BMS prevent power loss in flight?

It uses flight-mode logic that prioritises warning output over cutoff while the aircraft is airborne — for example, an undervoltage warning does not shut down the discharge MOSFET. Protection that could cut power is managed so the aircraft is not left powerless in the air.

Q4

Can one BMS manage multiple parallel battery packs?

Yes. The design coordinates up to eight packs in parallel, making it suitable for large-capacity Li-ion power systems on heavy-lift logistics UAVs, cargo drone fleets and large UAV or eVTOL platforms.

Q5

Which flight controllers and protocols does it support?

It provides CAN 2.0B and isolated UART with communication wake-up, plus DroneCAN (UAVCAN), Modbus and smart-charger compatibility — working with open ecosystems such as PX4 and ArduPilot. An isolated RS485 Modbus channel and optional Bluetooth app access are also available.

Q6

Can UFOPOWER customise the BMS for our UAV programme?

Yes. UFOPOWER offers project-based OEM/ODM services — pack series count, interfaces, protection thresholds and display logic can be adjusted to your airframe, with 100% factory testing before shipment. Contact sales@ufo-battery.com.

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