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EquaLink Battery Monitoring System

Complete Battery Management System

Active Battery Management System with Voltage Balancing

EquaLink is an Ethernet-based battery management system which monitors the voltage, internal resistance and temperature of each battery in a stationary battery system.

Through a patented Balancing process, EquaLink actively regulates the float charging voltage of each battery ensuring that all batteries charge at the optimal voltage.

EquaLink Battery Management System actively manages batteries to increase reliability and extend life, whereas other battery monitoring systems simply monitor batteries as they deteriorate.

EquaLink has the ability to monitor current, ambient/ room temperature, humidity, hydrogen gas and electrolyte levels (coming soon). Through available Form C contacts/ relays, EquaLink can also monitor electrical equipment such as UPSs, inverters, transfer switches, generators and air conditioning systems.

EquaLink is designed for lead acid batteries (flooded/wet, VRLA, gel, AGM, etc.) as well as some NiCd, NiMH and Li-Ion battery applications.

EquaLink is easy to set up and configure.


  • Individual voltage regulation (Balancing)
    • Avoid overcharging batteries
    • Avoid undercharging batteries
  • Extend the life of the system
  • Increase battery capacity
  • Detect stratification
  • Prevent thermal runaway
  • Eliminate/reduce maintenance
    • Cost and time savings
    • NERC PRC-005-2 compliance
    • Battery swaps
  • Receive warnings in advance via alarm
  • User-friendly browser interface and software included
battery monitoring system diagram
battery monitoring system software voltage screenshot
Status Log Includes Data for Each Battery

How It Works

EquaLink reads individual battery voltages and compares them to the battery system’s overall voltage. The average/target battery voltage is sent to each module, which steers current to or away from the battery if it deviates from the average/target battery voltage.

Due to its proprietary Balancing process, EquaLink surpasses other battery monitoring systems, having the ability to monitor and actively regulate battery voltage to within 0.001 volts of the system’s average float charging voltage.

EquaLink’s Balancing prevents overcharging and undercharging, ensuring maximum capacity and service life.

battery management/monitoring EquaLink


 PDF document - EquaLink Data Sheet

 PDF document - EquaLink Detailed Information

 PDF document - User's Manual

 PDF document - EquaLink Web Manager Manual

Available Environmental Monitoring

  • Temperature (ambient)
  • Humidity
  • Acid fill level
  • Hydrogen gas concentration

battery module for EquaLink management/monitoring system

battery management system software voltage graph

Extension of Service Life

The service life of a string of batteries is tied to the weakest battery in the system. Often, the service life of such a string is 50-60% of the manufacturer's design life. In the balancing process, each of the batteries within the string is maintained at optimal voltage levels, eliminating the ill-effects of improper charging. The constant care provided for by the Balancing process has been shown to increase the service life of batteries.

Detect Imminent Battery Issues

Typical battery problems like sulfation, corrosion, gassing, dryout, and thermal runaway are detectable given proper monitoring. Changes in impedance and temperature - which are monitored by EquaLink - tend to indicate the onset of such issues.

battery management system software screenshot
Screenshot of Equalink Live Viewer

Additional Major Benefits

Detect Stratification

By catching increases in impedance and drifting voltages, EquaLink allows the user to detect battery stratification.

Prevent Thermal Runaways

By means of an embedded dry contact output, the EquaLink system is capable of tripping the battery breaker in the event of thermal runaway. Automatic battery disconnection is possible, with the optional BM-AUX relay, which trips the battery breaker when user defined parameters are met.

Advance Warning System

Because it monitors key battery parameters and set thresholds, EquaLink is able to provide advance warning (via audio, video, and network messages) of system events that require attention.

Alert System

EquaLink monitors system data and environmental parameters (temperature, humidity, hydrogen gas concentration, acid fill level, DC current, dry contacts, etc.). Alerts can be set up, and this information can be accessed via multiple communications systems.

Regulate Charging

EquaLink is designed to monitor and optimize lead-acid and other battery types in a given battery system.

Avoid Overcharging

The balancing process prevents the unintended overcharging of batteries. (By preventing overcharging, EquaLink helps to limit gassing, dry-out, and thermal runaway.)


EquaLink improves the service quality by providing remote monitoring through Internet, VPN, or any network that allows for the downloading of real time data and battery history. It is now possible to test batteries without going to the trouble of disconnecting them from the system. Maintenance and testing take place under real operating conditions and require no downtime.


EquaLink battery modules are capable of taking precise measurements of individual battery voltage, internal resistance and, through an integrated sensor, surface temperature. These measurements are essential to making analyses of the batteries in any given system.

EquaLink transfers data through the communication bus cable system to the EquaLink WebManager.

There are 4 different types of EquaLink modules: 12 Volt, 6 Volt, 4 Volt and 2 Volt. The module can be mounted on the top or side of each battery.


Model BM-C20 BM-C40 BM-C30 BM-C23
Voltage 12 V 2 V 6 V 8 V
Ah Range 7–600 Ah 7–5000 Ah 7–600 Ah 7–900 Ah
Voltage Measuring/
Balancing Range
9.7–17 V 1.25–3.2 V 4.8–8.0 V 9.7–21.0 V
IR Range 0.5–60 mOhm 0.02–6 mOhm 0.5–60 mOhm 0.5–60 mOhm
Balancing Power (Current) 0.15 A 0.9 A 0.3 A 0.12 A
Current Consumption 15–20 mA (<1 mA sleep mode) 35–40 mA (<1 mA sleep mode)

Available Options

Part Number Description
BM-CT200A DC Current Sensor, 200 Amp
BM-CT400A DC Current Sensor, 400 Amp
BM-CT500A DC Current Sensor, 500 Amp
BM-CT1000A DC Current Sensor, 1000 Amp
BM-CT1500A DC Current Sensor, 1500 Amp
BM-AUX Terminal Relay Controller, 4 Digital Inputs and 4 Relay Outputs
SBS-H2 Hydrogen Gas Detector (BM-AUX also required)
BM-REM-TEMP-9 External Temperature Sensor for Module, 9"L
BM-REM-TEMP-35 External Temperature Sensor for Module, 35"L
BM-SPLIT 1 x 5 RJ10 Splitter Box
BM-ELSENSOR Electrolyte Level Sensor
BM-AMB-TEMP Ambient Room Temperature Sensor

EquaLink Order Code

    A B   C D
Example* BM- 125- 60 x 2V .01
Your Code BM-     x    
    Code Feature
A Nominal DC System Voltage 12-
12 Vdc
24 Vdc
48 Vdc
125 Vdc
250 Vdc
Other XXX Vdc
B Number of Individual Batteries to Monitor XXX Enter number of batteries (blocks or cells)
C Battery Voltage 2V
2 V Cells
4 V Blocks
6 V Blocks
12 V Blocks
D Input Power .01
120 Vac/12 Vdc
18 – 72 Vdc
120 – 370 Vdc

*Example part number BM-125-60x2V.01 represents: 125 Vdc system consisting of sixty (60) 2 Volt cells. WebManager to run on 120 Vac input power.

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