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• EMS-CPU Product Description:

EMS-CPU is the central processing unit (CPU) of the Energy Management System. It interfaces with sense boards (daisy chain) to obtain voltage and temperature data from each individual cell, and it interfaces with shunt sensor to read pack current. The CPU is powered by a 12V DC source. It detects ground fault error, calculates the State-Of-Charge (SOC) of the battery pack, provides video output signal for display of pack voltage, pack current, SOC level, as well as alarm status. The CPU also provides alarm outputs for protection against over-voltage, under-voltage, over-current and over-temp conditions. EMS-CPU comes with three parts: the CPU itself, a shunt sensor and a computer cable connecting between the CPU and the sense board strings. EMS-CAN or EMS-MOD can be purchased together with EMS-CPU to add CANBUS or MODBUS communication capability for data extraction. Sensor board strings and an optional LCD screen are also sold separately.

• Energy Management System (EMS) Parts Ordering

The following parts need to be ordered based on your battery pack requirement:

  - 1x EMS-CPU.
    EMS-CPU package includes a system computer, a shunt sensor for pack current
    measurement and a cable connecting the CPU to daisy chain of 4-cell strings.
  - A number of EMS-4SB20-V2, EMS-4SB-V7 or EMS-4SB200-V7 sense
    board strings. Each sense board string contains four sense boards connected as
    a 4-cell string. EMS-4SB-V7 strings are for 40Ah, 60Ah and 100Ah cells,
    EMS-4SB20-V2 strings are for 20Ah cells, and EMS-4SB200-V7 strings are for
    200Ah cells. EMS-4SB20-V2 strings can support up to a 16-cell (48V) pack.
    EMS-4SB-V7 and EMS-4SB200-V7 sense board strings support up to a 140-cell
    (500V) pack. If you have a 60-cell 100Ah pack, you will need 15x EMS-4SB-V7
    strings to be daisy chained together.
  - 1x EMS-LCD (optional). An optional LCD screen for display.
  - 1x EMS-CAN (optional) or EMS-MOD (optional). An optional CANBUS or MODBUS
    communication interface for data export.

• Energy Management System (EMS) Overview

The Energy Management System is designed for Li-ion battery pack using GBS 20Ah, 40Ah, 60Ah, 100Ah or 200Ah cells. The system components include a CPU, sense boards (connected as a daisy chain), a cable connecting the sample boards to the CPU, a shunt sensor, an optional LCD screen and an optional CANBUS or MODBUS communication interface. The features of the Energy Management System are:

  - Designed for battery packs using GBS 20Ah, 40Ah, 60Ah, 100Ah and 200Ah cells
  - A distributed system measuring voltage and temperature of each Li-ion cell
  - Daisy chain connection supporting up to 140 cells
  - Cell balancing
  - Integrated Ground Fault Detection and alarm output
  - Pack voltage measurement
  - Pack SOC calculation
  - Low voltage and high voltage alarm cutoff outputs
  - Optional CANBUS or MODBUS communication output
  - Composite video output
  - Made in the U.S.A.

• EMS Product Specifications:

  - Items Displayed: Pack voltage, current and capacity on main screen, individual
    cell number, cell voltage and cell temperature on detail screen(s).
  - CPU Power: 8-20V, 120mA
  - Battery Voltage: up to 500V
  - Number of Cells Supported: up to 140
  - Shunt Input: 500A = 50mV
  - Voltage Resolution: 0.1V
  - Current Resolution: 1A
  - Temperature Range: -99F to +199F or -146 to +92C
  - Video Output: Composite Video, Color, NTSC
  - Measurement Accuracy: <1% of Full Scale
  - Measurement Speed: 3 times per second main screen; 1 time per second detail
  - Cell Voltage: 2.00 to 4.50V
  - Balancing Threshold Voltage:3.55V
  - Balancing Current: 0.5A
  - Digital Output Current: 4A Surge for 100mS; 2A Continuous
  - Output Delay (default): 30 seconds
  - Ground Fault Detection: 2mA (5000 Ohm/Volt)
  - CPU Size: 5.70 x 2.60 x 1.80 in
  - Shunt Size: 3.25 x 1.75 x 1.75 in

This product was added to our catalog on Saturday 25 June, 2011.
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