Monitoring Technologies

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.