Dali Lithium Iron Phosphate Battery Protection Board for 4S 12V Packs with Cell Balancing

This Dali battery management system (BMS) is engineered specifically for lithium iron phosphate (LiFePO4) battery packs configured from four cells in series to deliver a nominal 12V output. Its core purpose is to provide comprehensive electronic protection and maintenance for your energy storage system, a critical component for safety and performance in applications like solar power storage, recreational vehicles, marine use, and portable power stations. By monitoring and controlling key parameters, it helps prevent common battery failures and promotes longer service life from your LiFePO4 cells.

Features and Construction

The board's functionality is built around a suite of protection circuits and a balanced construction tailored for robustness in various environments.

Core Protection Functions

The protection board continuously monitors the battery pack for hazardous conditions. It is designed to disconnect the load or charging source in the event of overvoltage (overcharge), undervoltage (over-discharge), excessive current draw (overcurrent), and short circuits. These safeguards are fundamental to preventing damage to the lithium cells, which can be sensitive to electrical abuse, and are essential for safe system operation.

Cell Balancing Technology

A key feature of this BMS is its integrated cell balancing function. In a multi-cell pack, individual cells can naturally drift to slightly different voltage levels over charge and discharge cycles. This board works to actively equalise these voltages across all four cells, ensuring no single cell is overstressed. Consistent cell voltage helps maximise the total usable capacity of the pack and contributes significantly to overall longevity.

Model Range and Specifications

The product is offered in an extensive array of models to suit a wide spectrum of power requirements and applications.

Current Rating Spectrum

You can select a model based on the maximum continuous current your application demands. The range starts at 15A for lower-power uses and scales up through common ratings like 30A, 50A, 100A, and 150A, right up to high-power models rated for 200A, 300A, 400A, and 500A. This allows for precise matching to your system's inverter, motor, or other load specifications.

Same-Port Design and Fan Options

All models utilise a same-port design, meaning the charge and discharge paths share common connection points. This simplifies installation by reducing the number of main cables needed compared to separate-port designs. For models rated at 80A and above, an integrated cooling fan is included. This fan assists in dissipating heat generated by the board's high-current components during operation, supporting sustained performance at the rated amperage.

Uses and Placement

This protection board is versatile and finds use in both professional and home energy contexts where reliable 12V DC power is needed.

Event or Professional Use

In professional settings like off-grid telecoms, mobile workshops, or event power supply, the higher-current models (200A and above) provide the robust protection needed for demanding equipment. The fan-cooled versions ensure reliability during extended periods of high load, which is common in these applications.

Everyday Home and Hobby Use

For DIY solar power setups, campervan conversions, home backup systems, or electric mobility projects like scooters, the mid-range current models (30A to 150A) offer a practical solution. The balancing function is particularly valuable for hobbyists building their own battery packs, as it manages cell health automatically.