Heltec SmartBMS LifePO4 (LFP) battery management system. Comes with hall effect current detector and wiring. Communicates either by CAN bus, RS485 for PC comms or through a mobile phone app (though the mobile app can currently only show individual status for 24 batteries).

Works with a string of 25-32 3.2V LifePO4 batteries (e.g. the ubiquitous Eve 280Ah / 320Ah) and can handle up to 500A continuous current and 2000A peak (more than adequate for most DIY EVs) through separate control relays (see my other listings). Also works with Lithium Ion and LTO batteries according to the manufacturer's site, see below for specs.

Brand new and unused (personal import) and in the UK - bought for an EV conversion project I've abandoned.

Manufacturer's specs:

Features:

Voltage requirements 10~20V~55V~120V

Dynamic self-consumption: ≤1.5W

Static self-consumption: ≤50uA

System startup mode: external soft switch signal trigger

SOC estimation difference: ±5%

Balance current: 60mA

Working temperature: -40~85°C

Support battery pack: 3-4S, 6-16S .17-24S

Single string voltage collection range: 0~5V

Single string voltage collection error: ±10mV FS

Total battery voltage collection range: depends on specifications

Total battery voltage collection error: ±100MV FS

Charge and discharge current collection range: >500A

Charge and discharge current collection error: ±2%

NTC temperature control collection range: -40~125°C

NTC temperature control check error: ±1°C

Communication:

1* UART Support Modbus protocol

1*Isolated RS485 interface, support Modbus protocol

1*Independent CAN2.0B interface

 

Ternary Lithium Battery

Overcharge protection: 4.25V

Charge release protection: 4.15V

Charge detection delay: 1000mS

Discharge and power failure protection: 2.7V±0.1V

Discharge release protection: 2.9V±0.1V

Discharge detection delay: 1000mS

Charging current: number of strings*4.2V

Continuous current: 200A~500A

Overcurrent protection: 200A *3-8 Times

Overcurrent detection delay: 3000mS

Overcurrent release protection: disconnect the load

Short-circuit protection: load short-circuit through the protection board (no direct short-circuit BMS)

Charging and discharging temperature: ≥75°C

Reset social equipment: <50°C

Condition range: -20°C ~85°C

Opening conditions of balanced pressure difference: 0.02V-0.05V

 

Lifepo4 Battery

Overcharge protection: 3.65V

Charge release protection: 3.55V

Charge detection delay: 1000mS

Discharge and power-off protection: 2.4V±0.1V

Discharge release protection: 2.6V±0.1V

Discharge detection delay: 1000mS

Charging current: number of strings*3.6V

Continuous current: 200A~500A

Overcurrent protection: 200A *3-8 Times

Overcurrent detection delay: 3000mS

Overcurrent release protection: disconnect the load

Short-circuit protection: load short-circuit through the protection board (no direct short-circuit BMS)

Charging and discharging temperature: ≥75°C

Reset social equipment: <50°C

Condition range: -20°C ~85°C

Opening conditions of balanced pressure difference: 0.02V-0.05V