20S 40A DALY Li-ion BMS 

Product Description:

The 20S 40A DALY Li-ion BMS is a reliable and durable Battery Management System designed for 72V lithium-ion battery packs (20 cells in series). It provides essential protection features including overcharge, over-discharge, overcurrent, and short-circuit protection, along with passive balancing to maintain voltage consistency across cells. This BMS is ideal for medium-power applications such as e-bikes, electric scooters, solar storage, and DIY energy systems.

Key Features:

• Supports 20S (72V nominal) lithium-ion battery packs

• 40A continuous discharge current

• Built-in protections: overcharge, over-discharge, overcurrent, short circuit

• Passive cell balancing to extend battery life

• Supports temperature protection via NTC sensor

• Separate charge/discharge port support (optional)

• Rugged design for stable long-term operation

Technical Specifications:

• Battery Type: Lithium-ion (3.7V nominal per cell)

• Series Configuration: 20S

• Nominal Voltage: 72V

• Maximum Charge Voltage: 84.0V (4.2V × 20 cells)

• Continuous Discharge Current: 40A

• Balance Current: Approximately 30–50mA

• Overcharge Protection Voltage: ~4.20V ± 0.05V per cell

• Overdischarge Protection Voltage: ~2.7V ± 0.1V per cell

• Overcurrent Protection: Yes

• Short Circuit Protection: Yes

• Temperature Protection: Yes (NTC sensor required)

• Operating Temperature: -20°C to +70°C

• Storage Humidity: ≤ 90% RH (non-condensing)

Applications:

• Electric bicycles and scooters

• Off-grid solar and energy storage systems

• DIY 72V lithium-ion battery packs

• Power backup and UPS systems

• Portable energy stations and light EVs