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Sentry-S15 Telecom Battery Monitoring System

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Sentry series compact battery monitors combine superior data quality and flexible installation to address cell site applications. Compatible with Battery Analyzer software, MyBattery Platform™ or other remote site management system with standard Modbus communication, Sentry monitors can be utilized for virtually every remote telecom application.

Sentry-0212S15 is specifically designed for 24V systems with up to 15 strings of 2x12V in parallel

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  • Digital Wavelet Technology. Precise IR (Internal Resistance / Conductance) online measurement is performed on each battery. User selectable internal resistance or conductance data display
  • No Noise/Interference to Power System. No need for high current discharge during internal resistance measurement
  • Over Voltage Protection. Designed with over voltage input for each sampling channel
  • High Resolution. 16 bit high resolution provides for clear and precise data acquisition
  • Solid State Scanning. (rather than mechanical relay) provides the highest reliability for telecom site and industrial applications
  • Modbus/RTU Communication. Provides high reliability and ease of integration
  • Compact Design. Permits convenient installation on top, or inside of the battery cabinet/rack
  • Access Data/Alarm from Anywhere. Firewall friendly Battery Analyzer software, plug and play, easy to manage large number of sites from anywhere via internet. Alarming through email, SMS and SNMP trap
  • HMI Panel. The plug and play touch panel (optional) allows the technician to configure and calibrate without the need of a PC
  • Supports Site/Building Management Systems. The system fully supports 3rd party network battery management systems with SNMP, Modbus TCP and hyperlink to real-time data

Key Features



Battery System

Optimized for telecom 24V system with 12V batteries

2x12V, 3 to 15 strings

(For 1 or 2 string, select Sentry-0212S2)

Power Supply

Powered by battery bank BUS, not by individual battery

String Voltage

Continuous monitoring with High/Low float charge voltage threshold and discharge Low setting

float current

Built-in proprietary float current measurement, no need for external sensor.
0.1A resolution, eliminates drift from Hall effect sensor, wide range 0 to 1,000A

Ambient temperature

2 sensors (1 for ambient and 1 for pilot, or 2 locations for a battery bank)

Individual battery voltage

Flexible interval to report data, high/low threshold for floating and discharge

Internal Resistance

Wavelet technology to achieve unsurpassed IR precision.


Compact aluminum, mounts on battery rack or on top on battery bank

Harness and installation

Simplified wiring design for easy installation

Pre-made/customized harness for quick installation enables large scale deployment

Portable touch screen for onsite validation

Battery discharge capture

High resolution capture, no limit to time lapse, no limit to onboard memory size. Online access to discharge curve for every battery (with MyBattery Platform™)

Generator Monitoring

Optional analog port for fuel monitoring
Optional digital ports for generator status


Instant drop-in, no field configuration.

Ethernet compatible with static and dynamic IP.
Optional wireless GSM/CDMA, M2M technology
Certified with PTCRB, AT&T, T-Mobile, Sprint, Verizon, Jasper and Rogers network

MyBattery Platform™ capacity

Cloud based parallel computing

No limit, validated with >10,000 sites


Standard Modbus RTU and Modbus TCP protocols. Software provides SNMP integration and SMS, email alarm delivery.


Battery System

24V battery system (18 ~ 30V range)

2x12V per string, up to 15 strings in one DC system

Power Supply

Internal power converter. Maximum Consumption: 6W


[email protected] to battery string

Current Sensor

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

(Default range +/- 400A, window size 20mmx10mm)


0.1% + sensor accuracy

Temperature Sensors

1 ambient temperature sensor, 1 pilot temperature sensor

Temperature Range

Measurement range: -20 to 60ºC, operating range: 5ºC to 40ºC (41ºF to 104ºF)

1 ºC accuracy

Bus Voltage

Range: 0 – 30V; Accuracy: 0.1%

Input Range to Each Channel

+/- 16V for 12V batteries



Internal Resistance/Conductance

0 to 30mΩ, 0.01 mΩ resolution

1-wire mode

Total value of Internal Resistance + Connection Resistance.

Serial Port

Isolated RS-232C and RS-485 interface

Protocol and Serial Settings

MODBUS RTU, 9600-8-1-None

Modbus address

1 to 28, configurable with HMI


Onboard Ethernet LAN connection to Battery Analyzer or MyBattery Platform
SNMP, Modbus TCP, email/SMS message, hyperlink to real-time data

Wireless Option

GSM/GPRS (PTCRB, AT&T, T-Mobile, Jasper, and Rogers Network certified)

LED indication

  • Dual-color LEDs for status
  • Orange LED for service alarm
  • Red LED for urgent alarm

Alarm Outputs

Service Alarm (Normal Close, Voltage-free, 60V 0.1A capacity)

Urgent Alarm (Normal Close, Voltage-free, 60V 0.1A capacity)


165W*31H*165L(mm) (Mounting bracket excluded)


Magnetic Cup (default), DIN rail or customized bracket

*Specifications subject to change without notice

Sentry-15 Datasheet (pdf)