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There are many types of BMS in the market for you to choose for your specific application(s). We recommend you to go through Comparison — Trial — Pilot before you commit to a full scale implementation.

Battery Monitoring System Comparison Chart

Feature Description BatteryDAQ Other BMS Brands Rectifier BMS accessories
Meets IEEE standard Published globally accepted battery monitoring measurements Yes Yes No
UL Certified Meets critical electric and fire safety standard, especially for Telecom sites Yes Not All Not All
Advanced SOH Proprietary SOH analysis model based on precise measurements and history Yes No No
Advanced SOC Proprietary SOC calculation and correction Yes No No
Advanced Runtime Proprietary Runtime estimation Yes No No
Internal Resistance Conductance/Impedance Yes Yes No
Discharge Capture Event automatically recorded for review Yes Not all No
Compact Hardware Specifically designed for telecom applications and cabinets Yes No N/A
Full line product For any size 24V and 48V bank with 2V, 6V, 12V batteries Yes No N/A
Easy Installation Save time and money for full scale deployment Yes No No
Temperature Range Wide temperature range for indoor and outdoor sites Yes No N/A
Embedded web page Web page review of integral measurements and health Yes No No
Robust software platform Ability to effectively manage thousands of sites Yes Not all No
Geo-map Reporting Color-coded SOH points on interactive map Yes No No
3rd party integration Ability to integrate with other site monitoring vendors Yes Not all No

Modular Product vs Sentry Series

Sentry Battery Monitor™ is designed according to latest IEEE standard 1491 – 2012: IEEE Guide for Selection and Use of Battery Monitoring Equipment in Stationary Applications.

Sentry Unit Individual Module
Power Supply Unit is powered by an external power adapter or battery bus. Module is powered by the individual battery. The difference of each module will cause a different ampere draw from an individual battery. Gradually, this may cause a floating charge voltage difference in some batteries in the string.
Communication Communicates directly to one CPU.
Fast, reliable
Communicates through a chain to each module.
Extremely slow. Some “nodes” may not communicate with the controller.
Corrosion concerns for vented batteries
Internal Resistance Wavelet digital signal processing to achieve a high precision and repeatable internal resistance measurement.

Injects signal from the middle point of a battery string. The signal is symmetrical; therefore it does not cause an imbalance in the batteries in the string.

Due to cost restrictions associated with modules, they cannot implement high level signal processing on a simple micro controller.Because the measurement discharging current is limited by small module’s heat dissipation, plus the A/D resolution and accuracy are low, it cannot obtain meaningful internal resistance data for 2V high capacity batteries.

Each module has its own discharge circuit. The difference will cause an imbalance for some batteries in the string.

Inter-cell and inter-tier connection resistance With 1-wire mode, the inter connection resistance is included in internal resistance reading. The system is able to detect a loose cable connection.With 2-wire mode, the inter connection resistance is measured separately and data for each inter-cell connection is available and recorded. Not able to detect any inter connection resistance problems.
Input Protection Protected Because it is powered by the battery, an over voltage event may protect a circuit by powering off. It cannot measure low voltage or reversed voltage.
Central control unit Not needed Must have
Installation FastPlug and play SlowMay need to configure each module in order to communicate with the controller.
Calibration One calibration for all channels in a unit. Each module has to be calibrated. Re-calibration is often necessary and time consuming.