Eagle Eye Power Solutions

iPQMS Battery Monitoring System

The iPQMS is a 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.

  • True 24/7/365 Battery Monitoring
  • Installation and maintenance can be done while battery systems are online
  • Meets IEEE 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

Visit Eagle Eye University for information on our battery training courses.



Measurement RangeBattery Capacity: 5 – 6,000 Ah
System Voltage: 0 – 999 VDC
Unit Voltage: 1.2, 2, 4, 6, 8, 12 VDC
Load Current: ±1,000 A
Temperature: 0 – 80°C (32 – 176°F)
Accuracy/ResolutionSystem Voltage: ±0.5% / 0.1 V
Load Current: ±2% / 0.1 A
Unit Voltage: ±0.5% / 0.01 V
Internal Resistance: ±2% / 0.001 mΩ
Unit Temperature: ±2% / 0.01°
Resistance Test LoadLess than 2A AC per cell
Measurement IntervalString voltage/current: Real-time
Cell voltage & Resistance: 10 min to 24 hours (adjustable)
Communication ProtocolsTCP/IP to proprietary software
AlarmingEmail/SMS alerts
Operating EnvironmentTemperature: 0 – 65 °C (32 – 150°F)
Relative Humidity: Under 80%
Power Requirements43 – 250 VDC, 480VDC options available
110 – 220 VAC
DimensionsMPU: 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.)


Product Literature

Support Documents



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.

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.

Does the iPQMS AC measurement signal affect the battery’s condition or lifespan?
The level of AC current applied to the battery by the monitoring system during measurement is insufficient to affect battery life, as it is not continuous nor is it a of a level that could cause the temperature to rise during the short period it is applied.

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.

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.


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