PGYBMS Hardware Protection Board PGY091 50A 4S LiFePO4 Power Management & Protection Module

The PGY091 4S 50A BMS protection board is designed for monitoring and protecting 4-series LiFePO₄ battery packs.
It integrates reliable protection and passive balancing functions to ensure safe operation, improved cell consistency, and extended battery life.

Electrical Specifications:
Battery Configuration: 4S (LiFePO₄)
Nominal Pack Voltage: 12.8V
Maximum Charge Voltage: 14.6V
Continuous Charge Current: 50A
Continuous Discharge Current: 50A
Cell Nominal Voltage: 3.2V
Over-Charge Protection (per cell): 3.75V (typ.)
Over-Discharge Protection (per cell): 2.2V (typ.)

Port Configuration:
Same Port Design: Charge and discharge share the same negative terminal (C−)
Cell Voltage Monitoring: Individual cell sensing via balance connector
Balancing Function: Passive balancing supported
Balance Current: 25–45 mA
Control Method: Hardware protection IC solution

Mechanical & Environmental Specifications:
PCB Dimensions: 95 × 50 × 10 mm
Operating Temperature: −20°C to +65°C
Storage Temperature: −40°C to +90°C
Operating Voltage Range: 8.8V – 15.0V

Application Scenarios:
12.8V LiFePO₄ battery packs
Energy storage systems
Backup power supplies
Solar battery systems
DIY LiFePO₄ battery projects