Description
The DALY BMS Li-ion 13S 48V 20A Battery Management System is a dedicated protection and balancing board for 13S lithium-ion battery packs. It is suitable for battery packs made using compatible 18650, 21700, 36500 cylindrical cells, and suitable prismatic Li-ion cells.
With a 20A continuous discharge rating, this BMS is designed for compatible medium-power battery applications such as electric bikes, electric skateboards, solar systems, RVs, power tools, camping equipment, boats, and household energy storage systems.
The BMS continuously monitors the battery pack and provides protection against several potentially damaging conditions, helping maintain safer and more stable battery operation.
13S 48V Li-ion Battery Pack Compatibility
This is a fixed 13S BMS configuration, meaning it is specifically designed for 13-series Li-ion battery packs.
It is intended for Lithium-ion battery chemistry only and should not be used with LiFePO4, LTO, or other battery chemistries. Always confirm the battery chemistry and series configuration before connecting the BMS.
Battery Protection Features
The DALY 13S 48V 20A BMS includes several protection functions designed to monitor and protect a compatible Li-ion battery pack:
- Overcharge protection
- Over-discharge protection
- Over-current protection
- Short-circuit protection
- Temperature protection
- Individual cell voltage monitoring
- Cell balancing
The supplied specifications list an overcharge detection voltage of 4.25 ± 0.05V per cell and an over-discharge detection voltage of 2.7 ± 0.1V.
20A Continuous Discharge Current
This DALY BMS supports a 20A continuous discharge current and a listed peak current of 60A ± 10A. The board uses power MOSFETs and a heat sink to help manage heat during operation.
For best performance, the connected battery pack and load should remain within the BMS’s specified current ratings.
Built-In Cell Balancing
The BMS features a built-in battery balancing function designed to help manage voltage differences between individual cells in a 13S battery pack.
The supplied specifications list a balance detection voltage of 4.18V, balance release voltage of 4.18V, and a balance current of 30 ± 5mA.
Cell balancing can help maintain more consistent voltage levels across the series-connected battery groups during charging.
Overcharge and Over-Discharge Protection
The BMS monitors individual cell voltages and can disconnect the battery when voltage reaches the specified protection thresholds.
According to the supplied product specifications, the overcharge detection point is 4.25 ± 0.05V, while the over-discharge detection point is 2.7 ± 0.1V per cell.
Short-Circuit and Over-Current Protection
The DALY BMS provides protection against excessive current and external short-circuit conditions. When a protection condition is detected, the BMS can disconnect the battery output to help protect the battery pack and circuit.
The listed specifications include an over-current detection delay of 1ms and a short-circuit detection delay of 250μs.
Temperature Protection
Temperature monitoring helps protect the battery pack during charging and discharging. The supplied specifications list a working temperature range of -20°C to 70°C.
The charging temperature protection limits are listed as below -5°C or above 50°C, while the discharge protection limit is listed as below 70°C.
Compatible Li-ion Battery Cells
This BMS is suitable for compatible lithium-ion battery packs made with cells such as:
- 18650 Li-ion cells
- 21700 Li-ion cells
- 36500 cylindrical Li-ion cells
- Compatible prismatic Li-ion cells
The battery pack must use Li-ion chemistry and the correct 13S configuration.
Applications
The DALY 13S 48V 20A Li-ion BMS can be used for a variety of compatible battery projects, including:
- Electric bikes and e-bikes
- Electric skateboards
- Solar battery systems
- RV power systems
- Camping power systems
- Power tools
- Electric boats
- Household energy storage
- DIY 48V Li-ion battery packs
- Other compatible 13S lithium-ion applications
Key Features
- 13S Li-ion battery configuration
- 48V-class battery pack compatibility
- 20A continuous discharge current
- 60A ± 10A listed peak current
- Overcharge protection
- Over-discharge protection
- Over-current protection
- Short-circuit protection
- Temperature protection
- Built-in cell balancing
- Individual cell voltage monitoring
- Low power consumption
- Heat sink for thermal management
- Protective PCB coating for improved resistance to environmental factors
What You Get
- 1 × DALY 13S 48V 20A Li-ion BMS
- 1 × 14-wire balance/sense cable with connector
- 1 × Instruction manual
Technical Specifications
| Specification | Details |
|---|---|
| Battery Type | Li-ion |
| BMS Configuration | 13S |
| Battery Voltage | 48V Class |
| Continuous Discharge Current | 20A |
| Peak Current | 60A ± 10A |
| Main Circuit Inner Resistance | ≤ 20mΩ |
| Charge Voltage | S × 4.25V |
| Charge Current | 10A |
| Overcharge Detection Voltage | 4.25 ± 0.05V |
| Overcharge Protection Delay | 1 second |
| Overcharge Release Voltage | 4.15 ± 0.05V |
| Balance Detection Voltage | 4.18V |
| Balance Release Voltage | 4.18V |
| Balance Current | 30 ± 5mA |
| Over-discharge Detection Voltage | 2.7 ± 0.1V |
| Over-discharge Protection Delay | 1 second |
| Over-discharge Release Voltage | 3.0 ± 1.0V |
| Over-current Detection Delay | 1ms |
| Short-circuit Detection Delay | 250μs |
| Working Current | 100mA |
| Sleep Current | 20μA |
| Working Temperature | -20°C to 70°C |
| Sleeping Temperature | -40°C to 80°C |
| Weight | 1.1 oz |
| Dimensions | 1.6 × 2.4 × 0.4 inches |
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