NB8 Battery Monitor Kit

Compact BMS Kit, including harness, 2 temperature probes, CT and 5ft harness.

Please choose 48V (default) or 24V

Harness for 4 batteries (default, 4x12V or 4x6V) or 2 batteries (2x12V)

O-ring size 6mm (default), 8mm optional

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Product Description

Sentry-NB8 monitoring unit 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 cabinets with 12V or 6V battery blocks. It combines superior data quality and flexible installation 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)

  • Onboard Battery State of Health (SOH and SOC) analysis.

  • Reliable Remaining Runtime prediction.

  • Compatible with MyBattery Platform™ for large scale deployment

  • Easy integration to existing site management software

  • Internal Resistance / Conductance online measurement for each block
  • Site configurable for 1 to 2 strings
  • Instant drop-in with no field configuration
  • Affordable for large scale deployment
  • Serial version (Sentry-S2) available with RS232/485 for 3rd party integration


Power Supply
Power Input Internal DC/DC converter, 36-60V input; Maximum Consumption: 3W
Current/Temperature Measurement
Current Sensor


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

(Default range +/- 100A, window size 20mmx10mm)

Accuracy 0.1% + sensor accuracy
Temperature Sensors 1 ambient/pilot temperature sensor
Range Measurement range: -40 to 65⁰C
Accuracy 1 ⁰C
Voltage Measurement
Battery 4 x12V and 8x6V battery, up to 200Ah

1 to 2 strings

Bus Voltage Range: 36 – 60V; Accuracy: 0.1%
Input Range to Each Channel +/- 18V for 12V batteries
Accuracy 0.1%
Internal Resistance
Range and Resolution 0 to 30mΩ, 0.01mΩ resolution
Wire mode 1-wire mode Internal Resistance for each battery block
Ethernet Onboard Ethernet DTU

Compatible with Battery Analyzer software and MyBattery Platform

Indication and Alarm
LED indication
  • Dual-color LEDs for status
  • LED for service alarm
  • LED for urgent alarm
Alarm Outputs Service Alarm (Normal Close, 0.1A capacity)

Urgent Alarm (Normal Close, 0.1A capacity)

Unit Dimensions 130mm(L) x 80mm(W) x 30mm(D)
Mounting Magnetic Cup

*Specifications subject to change without notice


Additional Information

Weight 2 lbs
Dimensions 12 × 8 × 4 in
DC Voltage

48V, 24V

Battery Number Per String

4, 2

O-ring Size

6, 8, 10