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Sentry-1202 Telecom Battery Monitoring System

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For 24V systems with high capacity 2V cells

Sentry-1202 is a powerful battery health monitoring system for Telecom 24V system with 2V cells up to 3,000Ah capacity. This compact battery unit combines superior data quality and flexible installation to address most cell site applications for effective remote battery management according to the IEEE updated standards:

IEEE Std. 1188 – 2005: Recommended Practice for Maintenance, Testing, and Replacement of Valve-Regulated Lead- Acid (VRLA) Batteries for Stationary Applications (IEEE Link)

IEEE Std. 1491-2012: IEEE Guide for Selection and Use of Battery Monitoring Equipment in Stationary Applications (IEEE Link)

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  • Onboard Battery State of Health (SOC) analysis.

  • Reliable Remaining Runtime prediction.

  • Compatible with MyBattery Platform™ for large scale deployment

  • Easy integration to existing site management software

  • Individual high resolution Internal Resistance / Conductance online measurement for 2V cells
  • Individual inter-cell connection resistance to further improve IR accuracy
  • Proprietary technology to monitor float current without external sensor
  • Ethernet and Wireless M2M compatible, instant drop-in with no field configuration
  • Battery Analyzer and MyBattery Platform™ compatible
  • Modbus-RTU or Modbus-TCP for integration for 3rd party software
  • Effectively priced for large scale applications


Power Supply
Power Input Powered by battery bus, 18-30V
Maximum Consumption: 10W
Average Consumption: 3W
Isolation [email protected] to battery string
Current/Temperature Measurement
Current Sensor   


Support  LEM HAS current sensor with internal +/-12V power supply   

(Default range +/- 400A, window size 20mmx15mm)

Accuracy 0.1% + sensor accuracy
Temperature Sensors 1 ambient temperature sensor
1 pilot temperature sensor
Range Measurement range: -40 to 65⁰C
Accuracy 1 ⁰C
Voltage Measurement
Battery 12 x2V cell, up to 3,000Ah
Bus Voltage Range: 18 – 30V; Accuracy: 0.1%
Battery Voltage +/- 3V for 2V batteries
Accuracy 0.1%
Input Wiring 2-wire differential input for each battery
Internal Resistance
Range and Resolution 0 to 3mΩ, 0.001 mΩ resolution
2-wire mode Internal Resistance and discriminate Connection Resistance.
Serial Port Isolated RS-232C and RS-485 ports
Modbus MODBUS RTU, 9600-8-1-None
Ethernet 10/100Mbps BaseT with RJ-45   

Onboard Ethernet DTU to MyBattery Platform

Embedded web page for real-time data

Wireless Option GSM/GPRS (PTCRB, AT&T, T-Mobile, Jasper, and Rogers Network Certified)
Indication and Alarm
LED indication Dual-color LEDs for status   

Orange LED for service alarm

Red LED for urgent alarm

Alarm Outputs Service Alarm (Normal Close, 0.1A)   

Urgent Alarm (Normal Close, 0.1A)

Dimensions 165W * 31H *165L (mm) (Mounting bracket excluded)
Mounting DIN Rail, magnetic cup or customized bracket

*Specifications subject to change without notice

Sentry-1202 Datasheet (pdf)