3S 4S 5S 100A 12V Lithium Battery Protection With Balance Charging and Protection
3S 4S 5S LiFePO4 3.2V 100A 12V Battery Protection With Balance Charging and Protection BM3451BFDC-T28A
The BM3451BFDC-T28A 3S/4S/5S LiFePO4 BMS is a 100A high-current Battery Management System for 12V lithium iron phosphate battery packs. Featuring overcharge, over-discharge, short-circuit protection, and active cell balancing, it ensures maximum safety and extended battery lifespan. With its compact design and support for 3S, 4S, and 5S configurations, it's ideal for solar storage, electric vehicles, e-bikes, RV power systems, UPS, and DIY battery packs requiring reliable, high-current performance.
نظام إدارة البطارية BM3451BFDC-T28A 3S/4S/5S LiFePO4 هو نظام إدارة بطارية عالي التيار بقدرة 100 أمبير مخصص لـ حزم بطاريات الليثيوم 12 فولت من نوع LiFePO4. يتميز بـ حماية من الشحن الزائد، والتفريغ الزائد، والقصر الكهربائي، إضافة إلى موازنة الخلايا النشطة، مما يضمن أقصى درجات الأمان وإطالة عمر البطارية. بفضل تصميمه المدمج ودعمه لتكوينات 3S و 4S و 5S، يُعدّ مثالياً لـ أنظمة تخزين الطاقة الشمسية، والمركبات الكهربائية، والدراجات الكهربائية، وأنظمة طاقة المنازل المتنقلة، وأنظمة UPS، وحزم البطاريات DIY.
The BM3451BFDC-T28A Battery Management System (BMS) is a professional-grade, high-current protection and balancing board designed specifically for LiFePO4 (Lithium Iron Phosphate) battery packs in 3S, 4S, or 5S configurations. Built to handle a continuous current of 100A, this BMS is engineered for demanding applications that require both high power delivery and strict safety oversight — making it the ideal choice for serious DIY battery builders, solar energy enthusiasts, and electric vehicle developers.
The board provides comprehensive protection features that safeguard your battery pack against the most common failure modes:
- Overcharge Protection prevents individual cells from being charged beyond their safe voltage limit (typically 3.65V per LiFePO4 cell), preventing dangerous gas formation and thermal runaway.
- Over-Discharge Protection automatically disconnects the load when cell voltages drop below the safe minimum (typically 2.5V), preventing irreversible cell damage and capacity loss.
- Over-Current Protection monitors the current draw and trips when the load exceeds safe limits, protecting both the BMS and the battery cells.
- Short-Circuit Protection instantly disconnects the load if a short circuit is detected, preventing fires and battery damage.
- Cell Balancing equalizes the voltage across all series cells during charging, ensuring optimal pack performance, longer cycle life, and uniform aging across all cells.
The BMS supports multiple cell configurations — 3S (9.6V nominal), 4S (12.8V nominal), and 5S (16V nominal) — providing flexibility for various pack designs. The most common configuration, 4S LiFePO4, delivers a nominal 12.8V that is fully compatible with standard 12V automotive, marine, and solar systems, making this BMS a popular choice for drop-in lead-acid replacement projects.
With its compact and efficient design, the BMS minimizes voltage drop during high-current operation, while the integrated thermal management ensures stable performance even under continuous load. Its robust construction and high-quality components are designed to withstand the rigors of demanding power applications including golf carts, electric scooters, marine systems, off-grid solar setups, and home backup power systems.
Specifications
- Model: BM3451BFDC-T28A
- Battery Chemistry: LiFePO4 (Lithium Iron Phosphate)
- Cell Configurations: 3S / 4S / 5S (selectable)
- Nominal Voltage:
- 3S: 9.6V
- 4S: 12.8V (most common, 12V system)
- 5S: 16V
- Maximum Charge Voltage:
- 3S: 10.95V (3.65V × 3)
- 4S: 14.6V (3.65V × 4)
- 5S: 18.25V (3.65V × 5)
- Continuous Discharge Current: 100A
- Peak Discharge Current: >100A (short duration)
- Continuous Charge Current: Up to 50A (typical)
- Overcharge Protection per Cell: ~3.65V – 3.75V
- Over-Discharge Protection per Cell: ~2.5V – 2.8V
- Short Circuit Protection: Built-in (auto-recovery)
- Balancing: Passive Cell Balancing (typical for this class)
- Operating Temperature: -20°C to +70°C
- Application: Battery packs, solar storage, EVs, e-bikes, UPS
- Compliance: RoHS Compliant
Applications
- Solar Energy Storage Systems — off-grid and hybrid solar installations
- Electric Vehicles (EVs) — golf carts, scooters, and small EVs
- E-Bikes & E-Scooters — high-power lithium iron phosphate packs
- RV & Caravan Power Systems — drop-in replacement for lead-acid 12V batteries
- Marine Battery Systems — boats, yachts, and trolling motor packs
- Home Backup Power (UPS) — uninterruptible power supplies
- Off-Grid Cabin Power Systems — reliable lithium storage for remote locations
- DIY 12V LiFePO4 Battery Packs — building custom 12V battery banks
- Electric Forklifts & Industrial Vehicles — heavy-duty lithium packs
- Electric Mowers & Garden Tools — lithium-powered outdoor equipment
- Robotics & AGVs — autonomous guided vehicles and large robots
- Telecom Backup Power — base station and equipment backup
- Medical Equipment Backup — critical equipment power continuity
- Camping & Outdoor Power Stations — portable lithium power packs
- Drone Charging Stations — high-current charge/discharge systems
- Solar Pump Systems — water pumping for agriculture
- Electric Boats — electric propulsion battery packs
- Standalone Lighting Systems — solar street lights and outdoor lighting
- Replacement BMS — upgrading existing 12V LiFePO4 systems