TDT LFP 4S-20AMP(JLGW) HARDWARE BMS

The JLGW LiFePO₄ 4S-20AMP Battery Management System (BMS) is a compact protection module designed for 12.8 V LiFePO₄ (LFP) battery packs built from 4 cells in series (4S). It ensures safe, reliable battery operation by monitoring voltages, currents, and temperature and actively protecting the battery from harmful conditions. This type of BMS is often used in solar storage, UPS/backup systems, small electric vehicles, and DIY battery builds.

Key Features

Battery Type: Lithium Iron Phosphate (LFP, LiFePO₄)

Cell Configuration: 4 S (4 cells in series, ~12.8 V nominal)

Continuous Current Rating: ~20 A

Protection Functions:

Over-charge protection — stops charging when cell voltages exceed safe limits.

Over-discharge protection — shuts off load when battery voltage drops too low.

Over-current protection — prevents excessive discharge current that could damage battery.

Short-circuit protection — cuts off power in case of a short on the output.

Temperature protection — monitors pack temperature and prevents overheating.

Cell Balancing: Helps equalise the voltage across all cells for longer service life.