BMS Main 3 / BMS Main 3X
Controller / Strings controller
Modular BMS controller for 24-2000V batteries
Depending on firmware, device can act as a battery controller (BMS Main 3) that interacts with measuring modules, or as a controller of parallel batteries (BMS Main 3X).
BMS Main 3 can control up to 40 measuring modules and manage a battery consisting of 720 cells.
BMS Main 3X controls up to 32 batteries connected in parallel, each of them is managed by the BMS Main 3.

- 6 switches for contactors
- 8 discrete inputs
- 4 discrete outputs
- SOC, DOD, SOH estimation
- Cycles, energy counting
- 3xCAN, RS-485, USB
- Wi-Fi, LAN, GSM (over an extension modules)
- SD-card logging
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Downloads
Compatible controllers (for BMS Main 3X only): BMS Main 3
Compatible measuring modules (for BMS Main 3 only): BMS Logic 12S, BMS Logic 12, BMS Logic 18, BMS Logic 2.0
Compatible displays (for BMS Main 3X only): BMS Display
Compatible displays (for BMS Main 3 only): BMS Display, BMS Indication
Compatible additional modules: BMS IMD, BMS Wi-Fi, BMS LANmodule, BMS GSM
Parameter | Value |
---|---|
Supply voltage, V | 9 ÷ 32 |
Current consumption @24 V, mA (max) | 150 |
KEYRUN or CHARGE_ON signal for powering on the device, V, (minimum) | 8.5 |
Number of BMS Logic devices (relevant for BMS Main 3) | 1 ÷ 40 |
Number of cells (maximum) (relevant for BMS Main 3) | 720 |
Number of parallel batteries (relevant for BMS Main 3X) | 1 ÷ 32 |
Number of programmable switches for contactors (9-32V, 2,5A) | 6 |
Number of programmable discrete inputs (dry contact) | 6 |
Number of programmable discrete inputs (9-32V) | 2 |
Number of programmable discrete outputs (open drain, 60V, 1A) | 4 |
Number of current sensors (two signal lines on each sensor) | 3 |
Current sensor type | Hall-Effect sensor, bidirectional (LEM series: HASS, HTFS, DHAB or analogues) |
Current sensor signal measurement error, V (maximum) | 0.001 |
Number of HV measurement inputs (two signal lines on each input) | 2 |
High voltage measurement range, V | 10 ÷ 1000 |
High voltage measurement error, V (maximum) | ±2 |
Number of external temperature sensors (100k thermistors) | 2 |
Temperature measurement error with external sensors, ºС (maximum) | ±2 |
Temperature measurement error with internal sensor, ºС (maximum) | ±2 |
Relative humidity measurement error, % (maximum) | ±10 |
HVIL typical current, mA | 25 |
HVIL resistance, Ohms (maximum) | 200 |
Number of USB interfaces | 1 |
USB speed, Mbit/s | 12 |
Number of CAN interfaces | 3 |
CAN bus speed, kbps | 125, 250 (default), 500, 1000 |
Number of RS-485 interfaces | 2 |
RS-485 bus speed, bps | 600, 1200, 2400, 4800, 9600 (default), 19200, 38400, 57600, 115200 |
CAN2 output voltage, V | 5 ± 0.5 |
CAN2 output current, mA (maximum) | 400 |
Rated insulation voltage, AC 50Hz, 1 minute, VRMS (minimum): 1) Between CAN1, RS-485-1, discrete inputs/outputs and power lines, 2) Between CAN1, RS-485-1, discrete inputs/outputs and HV measurement lines, 3) Between power lines and HV measurement lines | 3500 |
Dimensions (length × width × height), mm | 200 × 120 × 20 |
Weight, g | 163 ± 5 |
Operating temperature range, °С | -40 ÷ 85 |
The degree of protection from external influences | IP00 |