iPQMS Battery Monitoring System

Model # IPQMS

Eagle Eye’s iPQMS Real-Time Battery Monitoring System is designed to measure the aging status of up to 448 jars (or 448 cells) by measuring and recording: string voltage, string current, cell voltage, cell/connection resistance, and cell temperature.

The iPQMS is a robust battery monitoring system designed specifically for utility environments. It ensures backup power systems are optimally maintained in large-scale environments by eliminating the need for regular on-site battery testing. The iPQMS is designed to be used on a network with Eagle Eye's proprietary battery management software. The software allows external email alerts during alarms, as well as in-depth trending and reporting. Through the software, the iPQMS can utilize Modbus protocol for integration to a distributed control system (DCS) or SCADA (some limitations apply). Flexible expanding solutions allow multiple iPQMS units to monitor all your systems in real-time.

  • Specifications
  • FAQs
  • Benefits
  • More Info

Technical Specs

Measurement Range:Battery Capacity: 5 – 6,000 Ah
Nominal Unit Voltage: 1.2, 2, 4, 6, 8, or 12 Volts
System Voltage: 0 – 999 VDC
Load Current: ±999.9 A
Accuracy / Resolution:System Voltage: ±0.5% / 0.1 V
Load Current: ±1% / 0.1 A
Unit Voltage: ±0.5% / 0.01 V
Internal Resistance: ±2% / 0.001 mΩ
Unit Temperature: ±2% / 0.1 °
Test Speed / Test Load:4 seconds per cell / less than 2 amps AC per cell
Measuring Interval:Adjustable from 10 min to 24 hours (cell/unit readings)
Data Transfer:TCP/IP to proprietary software, Modbus (via software)
Operating Environment:Temperature: 0 – 65 °C (32 – 150 °F)
Relative Humidity: Under 80%
Power Requirements:Input: 43 – 250 VDC / 110 – 220 VAC
Dimensions:MPU: 290 x 280 x 90 mm (11.4 x 11 x 3.5 in.)
RU: 310 x 178 x 85 mm (12.2 x 5.9 x 3.3 in.)


What are some common applications areas for this product?
Common applications include but are not limited to:

  • UPS Systems
  • Power Utilities and Distribution
  • Financial Institutions
  • Telecom/Communications
  • Oil, Gas & Fuel
  • Mining
  • Government/Defense
  • Transportation Operations
  • Hospitals
  • CATV Broadcasting
  • Emergency Lighting
  • Green Energy
  • Call Centers
  • Battery Suppliers and Manufacturers
  • Medical/Biotechnology
  • Generators

What hardware / components come with the iPQMS Battery Monitoring System?
A complete BMS system will have the following components:

  • Main Processing Unit (MPU) – Processes measurement data, displays measured data on LCD, houses communication connections to network.
  • Relaying Unit (RU) – Relays measured data directly from the batteries to the MPU (not involved with communication or alarming).
  • Sensing Cables – Cables which connect to the BMS clamps from the RU for gathering measurement data.
  • Clamps – Physical connection to the battery system, connects to the inter-cell connections.
  • CT – Hall Effect CT clamp for measuring DC current.

Does the iPQMS calculate the capacity of the batteries?
No, the iPQMS 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).

Can the iPQMS monitor battery systems in parallel?
Yes but with certain limitations. A single iPQMS can monitor every jar / cell in a parallel system, however it can only monitor (1) string voltage and (1) string current. Additionally, the iPQMS cannot differentiate between the banks and will show all jars / cells as one bank.

How does Eagle Eye’s Centroid 2 software work?
The Centroid 2 software is composed of two parts, the server and the client. Centroid 2 Server is installed on a dedicated PC that must be connected to the same network as the iPQMS system(s). This software runs in the background on a Windows environment as a service. Centroid Viewer client must also be installed on a PC that is on the same network as the iPQMS. The client can be installed on multiple computers and can pull data directly from the PC with Centroid 2 Server running.

How does the iPQMS test jar/cell resistance?
The system injects 400mA to 2A (max.) AC current for a duration of 900ms per jar / cell. During the 900ms duration is (3) 300ms tests. The average of these (3) tests is used as the final test result.

What are the cable distance limitation between the MPU to RU and RU to batteries?
MPU to RU: 10 m (32 ft)
RU to Batteries: 30 m (100 ft)

Which parameters are measured in real-time?
String voltage and current are measured in real-time, values are continually updated on the iPQMS screen and in the software.

Which parameters are measured on interval and what is that interval?
Cell voltage, cell resistance, and cell temperature are measured on set intervals. These intervals can be set at any time from every 10 min. to once daily. In the event of a discharge these parameters will be measured continually until the discharge has ended.

How long does the system take to measure the resistance of the whole string?
The length of time varies depending on the number of jars. Regardless of the jar quantity, the system takes 3 seconds to measure the jar (actual load duration is 900ms per jar). The measurement cycle on a 60-cell system measuring per jar would take 180 seconds.

Does the iPQMS have any dry contact relays?
No, the iPQMS does not have a native dry contact relay. An add-on relay can be purchased which will allow a single Form C to be used in the event that any alarms are active. A dedicated PC is required for each iPQMS when using the add-on relay.

What are the communication options for the iPQMS?
There are two standard communication options for the iPQMS (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 iPQMS measurement data.
  • Modbus TCP/IP – This option should be used if the measurement data will be integrated into a distributed control system (DCS) or SCADA system. Use of Modbus protocol requires installation of the software on a server.

Are there any options for using Eagle Eye’s software in addition to Modbus protocol?
Yes, a single iPQMS can communicate via TCP/IP to a dedicated PC with Centroid 2 installed. Through the software, Modbus protocol can output from the PC. Each iPQMS system requires its own server PC for this solution and is offered as complete kit.

Is the iPQMS hardware rated as explosion proof?
The hardware is not officially rated as explosion proof, however it was designed to be mounted and exposed permanently in a battery room environment. If ex-proof is absolutely required then cabinet solutions are available to meet any specific requirements.

Can the iPQMS measure lithium battery types?
No, currently the system cannot measure any type of lithium battery.

What frequency does the iPQMS use during measurement?


  • True 24/7/365 Battery Monitoring
  • 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
  • Simple to install with custom (to your batteries and site), pre-assembled installation materials
  • Can monitor all your systems in real time with flexible expanding solutions
  • Can be powered by AC or connected DC
  • Includes battery management software for:
    • 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

Note: Modbus protocol can be provided if the user would like to transmit the test results to their management system.

More Info

Battery failure can happen overnight, and Eagle Eye’s BMS-Series real-time battery monitoring allows full protection and confidence against such failures. Ohmic resistance and voltage measurements (per jar) are taken as often as every five minutes. String current, DC voltage, and temperature are measured in real-time. These measured parameters will provide the user a real-time understanding of their batteries state-of-health.

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.

Ohmic resistance results represent the condition and state-of-health of the battery, and expose weaknesses in cells & intercell conditions without stressing the battery. Cell and string voltage results can indicate if the battery is fully charged or if there are problems with the battery or charger. Stable temperature results indicate a proper operating environment, while high recorded temperatures can be a sign of thermal runaway. Use the iPQMS battery monitoring system to measure these parameters to protect the integrity of your system, and exceed industry testing requirements by IEEE and NERC.

The iPQMS Battery Monitoring System Includes:

  • iPQMS MPU Body
  • Relaying Units (up to seven per MPU)
  • Clamps: O-Type for cable connection or C-Type for bus-bar connection
  • Sensing cable (current line)
  • Signal cable (voltage line)
  • Temperature cable
  • Total voltage current cable
  • Control power cable
  • Centroid Battery Management Software
  • User Manual

Before installation of the iPQMS, Eagle Eye will send you an BMS-Series Site Survey Form. This site survey form allows us to customize your iPQMS battery monitoring system based on your batteries, network, and battery site.

The iPQMS battery monitoring system comes complete with Eagle Eye's Centroid Battery Management Software package which allows all battery systems to be monitored 24 hours a day, 365 days a year via a remote computer. Centroid provides real-time battery monitoring and string/cell trending with reporting capabilities. String trending reports provide system resistance, voltage, temperature, and voltage/ohms comparison. Cell trending reports provide battery/connection resistance, voltage, and temperature. Custom alarm settings can be configured per string.

Reduce maintenance costs, improve up-time and manage battery assets effectively by using the iPQMS battery monitoring solution. Real-time battery monitoring systems protect the user from costly downtime, data loss, and security risks. Real-time battery monitoring also reduces maintenance and replacement costs by maximizing battery life.

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  • Model #

    Battery Monitoring Solution
    Up to 448 Jars (or 448 cells)

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Companies We Serve
  • Caribbean Utilities CompanyState of Idaho Homeland Security
  • TelAlaskaDuke Energy