7S-40A LiFePO₄ (LFP) BMS — DALY Model

Overview
The DALY 7S-40A BMS is designed for 7-cell LiFePO₄ battery packs connected in series. It supports continuous discharge current up to 40A and offers critical protections, passive cell balancing, and optional communication features.

Specifications

• Cell Configuration: 7S (7 cells in series)

• Battery Chemistry: LiFePO₄ (LFP)

• Nominal Voltage: 22.4V (3.2V × 7)

• Maximum Continuous Current: 40A

• Peak Current: Typically 60A to 80A (short bursts)

• Balancing Type: Passive balancing

• Balance Current: Around 30mA to 100mA

• Protection Features:

  • Over-voltage protection

  • Under-voltage protection

  • Over-current protection

  • Short-circuit protection

  • Over-temperature protection

  • Under-temperature protection

• Communication (model dependent):

  • Bluetooth

  • UART

  • CAN

• Operating Temperature Range: -20°C to +60°C

Features

• Real-time cell voltage monitoring

• Automatic passive cell balancing during charging

• Comprehensive charge/discharge protection

• Optional Bluetooth support with DALY Smart BMS app

• Compact, durable design suited for mid-power packs

Applications

• 22.4V LiFePO₄ battery systems

• Electric bikes, scooters, and small EVs

• Portable solar storage and backup power

• DIY 7S LiFePO₄ battery projects

• Light electric mobility devices

Important Notes

• Intended for LiFePO₄ (3.2V/cell) chemistry only

• Proper wiring of balance leads and power terminals is essential

• Charger and load should not exceed 40A continuous current rating

• Bluetooth and other smart features require compatible BMS versions

• Cooling or airflow may be needed during high continuous loads