BMS-Series Battery Monitoring Systems

Model # BMS-Series

The BMS-Series battery monitoring system from Eagle Eye provide complete real-time monitoring for VLA (vented lead-acid), VRLA (valve-regulated lead-acid, and NiCad (nickel cadmium) batteries. Measure key battery parameters including string voltage, string current, cell voltage, cell/connection resistance, cell temperature, and ambient temperature.

The BMS-Series includes various models to fit a variety of needs and applications. All industrial battery products are compatible with Eagle Eye's proprietary battery management software. Centralized software allows 24/7/365 monitoring for all battery systems. Trend measurement data over time, generate reports, replay discharge events, and receive email/SMS alerts.

Complete solutions for NERC compliance are also available, see our EE-NERC-BMS battery monitoring solution for all the features of the BMS-Series industrial battery products with the additional option of electrolyte level, ground fault, and hydrogen gas monitoring.

  • Specifications
  • FAQs
  • Benefits
  • More Info

Technical Specs

Measurement Range:Cell/Unit Voltage: 0.0 – 16.0 VDC
Cell/Unit Temperature: -20 – 80°C (-4 – 176°F)
DC Voltage: 0 – 576 VDC
DC Current: ±10,000A
Accuracy:DC Voltage / Current: ±0.5% / ±1%
Temperature: ±2%
Internal Resistance: ±2%
Cell Voltage: ±0.5%
Resolution:DC Voltage / Current: 0.1 V / 0.1 A
Cell Voltage: 0.001 V
Internal Resistance: 0.001 mΩ
Temperature: 0.1°C
Test Load:Less than 2 amps per cell/unit
Alarm Relay:Up to (8) Form C (on select models)
Measuring Interval:Adjustable from 10 min to 160 hours (voltage & I.R.)
Data Transfer:TCP/IP to proprietary software, Modbus TCP/IP, DNP3(1)
Operating Environment:Temperature: 0 – 65 °C (32 – 150 °F)
Relative Humidity: Under 80%
Power Requirements:DC from connected battery or AC

1) DNP3 available for BQMS models only


What BMS-Series model is best for my application?
Outlined below are some of the key features of each BMS-Series model. It is recommended to contact Eagle Eye to discuss your specific needs.

  • BQMS: Monitor up to 480VDC (440) cells/units (with dry contacts, DNP3 option)
  • iPQMS: Monitor up to 480VDC (448) cells/units (with on-site display)
  • BDS-Pro: Monitor up to 240VDC, (24) cells/units
  • iPQMS-Pro: Monitor up to 480VDC, (40) 12V units
  • BMS-icom: Monitor up to 48VDC, (4) 12V units

What are some common applications for the BMS-Series
Common applications include but are not limited to:

  • Power Utilities and Distribution
  • UPS Systems
  • Telecom/Communications
  • Transportation Operations
  • Government/Defense
  • Oil, Gas & Fuel
  • Generators
  • Financial Institutions
  • Mining
  • Battery Suppliers and Manufacturers

Does the BQMS calculate the capacity of the batteries?
No, the BQMS does not perform a load test, so there is no way for the system to calculate the capacity. The system does detect and record all discharge events to show how each cell performed during the duration of the test.

What are the options for installation of the system(s)?

There are several options for installation:

  • The customer can install the systems with free remote support from trained Eagle Eye technicians.
  • The customer can select a training package for installation of the systems, either onsite training by Eagle Eye’s technicians or at Eagle Eye’s facility.
  • The customer can select an installation package where Eagle Eye technicians perform the complete installation of the system(s).

What are the communication options for the BMS-Series?
There are two standard communication options for the BQMS (only one communication method can be utilized per system).

  • TCP/IP to Eagle Eye’s proprietary software Centroid 2 – This option provides the most information about the health of the battery system as the software was specifically designed to take full advantage of the BQMS measurement data.
  • Modbus protocol over TCP/IP – This option should be used if the measurement data will be integrated into an existing building management of SCADA system.
  • DNP3 protocol - This option is only available for BQMS models and does not include the Centroid software.


  • True 24/7/365 Battery Monitoring
  • Various models available to fit a wide range of applications
  • Installation and maintenance can be done while battery systems are online
  • Meets IEEE and NERC standard recommendations for battery monitoring solutions
  • Utilizes a patented ripple-removing algorithm for the most precise and repeated results in any environment
  • Injects a minimal current, allowing the user to test their battery multiple times a day without adverse effects on your battery or battery monitoring system
  • Includes dry contacts for external alarming (BQMS only)
  • Simple to install with custom (to your batteries and site), pre-assembled installation materials
  • Can monitor all your systems in real-time
  • Can be powered by AC or DC
Battery Management Software:
  • Battery trending
  • Creating battery reports
  • Displays VDC and IDC in real time
  • Displays Voltage, Resistance & Temperature Per Cell
  • Sends an email to the person in charge if battery is at a warning or failure level
  • Records discharge & recharge and can be played back to view system and battery level performance during discharge

More Info

Why Battery Monitoring?

  • Ensure batteries will function immediately and relabily when required.
  • Obtain the maximum service live possible from batteries
  • Save on time, cost, and resources
  • Required for NERC PRC-005 compliance in North America; recommended by IEEE worldwide
  • Battery monitoring can help achieve all of these things

Battery failure can happen overnight, Eagle Eye's BMS-Series provides full protection and confidence against such failures. Key battery parameters are measured and recorded including: string voltage, string current, cell voltage, cell/connection resistance, cell & ambient temperature.

100% functionality is required for backup power systems to be effective. Every battery in a system contributes to the overall health of a system, and one bad battery can compromise an entire backup power system. Continuous battery monitoring will provide the results to ensure proper battery management and protection during an event outage.

Battery Monitoring Requirements & Recommendations

Battery monitoring can satisfy compliance for NERC PRC-005 which is the standard for Protection Systems Maintenance and Testing. It also satisfies components of IEEE Standard 1491 - Guide for Selection & Use of Battery Monitoring Equipment in Stationary Applications.

NERC PRC-005 continues to be the most commonly violated NERC reliability standard in North America. It requires utilities to document and implement programs for the maintenance of all protection systems affecting the reliability of the Bulk Electric System (BES). All VLA, VRLA and NiCad Batteries are required to be verified, inspected, monitored & calibrated to meet PRC-005 compliance. Continous battery monitoring can alleviate the need for certain recommended maintenance practices that require time and resources and even elimitate on-site testing altogether when fully implemented.

For complete NERC PRC-005 complinace, see our EE-NERC-BMS monitoring solutions.

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