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Sentry-NB4 Compact Battery Monitor

Sentry-NB4 Battery Monitor

SentryNB4 monitor provides powerful functions for online state-of-health battery management for large scale remote telecom cabinets or stations. The compact design makes it suitable for any size indoor/outdoor 24V or 48V system cabinets with 12V or 6V battery blocks. It combines superior data quality and ease of installation for effective remote battery management in accordance with the most recent IEEE standards:

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

Main Features

Sentry NB4    
  • Onboard Battery State of Health (SOH, SOC and Runtime) analysis.

  • Reliable Remaining Runtime prediction.

  • Compatible with MyBattery Platform™ for large scale deployment

  • Easy integration to existing site management software

  • Online IR (Internal Resistance) measurement to detect battery failure.

  • Thermal runaway detection and protection control output to interface with most chargers/rectifiers.

  • Embedded web pages for remote monitoring.

Quick Guide to Sentry-NB4 Kit


Power Supply

Power Input

Internal DC/DC converter, 18-60V input; Maximum Consumption: 3W

Current/Temperature Measurement

Current Sensor


Supports LEM HASS current sensor with internal +5V power supply

(Default range +/- 300A, window size 20mmx10mm)


0.1% + sensor accuracy

Temperature Sensing

1 temperature sensor, intelligent thermal runaway detection algorithm

Temperature Range

Measurement range: -40 to 85⁰C
Operating range: -30⁰C to 55⁰C (22⁰F to 131⁰F)


1 ⁰C

Voltage Measurement

Battery Configuration

48V system, 4 x 12V batteries

24V system, 2 x 12V or 4x6V batteries

[Special order available for 12V and 36V systems.]

Bus Voltage

Range: 18 – 60V; Accuracy: 0.1%

Input Range to Each Channel

+/- 18V for 12V batteries



Internal Resistance

Range and Resolution

0 to 30mΩ, 0.01mΩ resolution

Wire mode

1-wire mode Internal Resistance for each battery block



Onboard Ethernet DTU

Embedded web pages for real-time data and configuration/calibration

Compatible with Battery Analyzer software and MyBattery Platform

Indication and Output

LED indication

Dual-color LEDs for status and alarm

Control Output

Normal Close, 0.1A capacity to control charger/rectifier ON/OFF for thermal runaway protection


Unit Dimensions

115mm(H) x 90mm(D) x 32mm(W), 4.50 x 3.50x 1.25 in.


DIN-35 rail (a versatile clip included)

*Specifications subject to change without notice