80% of UPS failures are due to undetected battery problems. All batteries fail, its just a matter of time. If you’re operating mission critical systems and relying on the protection of a UPS and battery bank, then it has to make sense to have battery monitoring. It’s about peace of mind – knowing that the batteries are healthy and being constantly monitored. Knowing that everything has been done, that can be done, to protect your enterprise from the consequences of a power failure.

Sentinel System provides the most advanced and most cost-effective tool for monitoring and managing stand-by battery banks. PowerShield’s continuous data sampling, reporting and battery management capability delivers reduced costs, gives peace of mind, and most importantly – ensures that you have batteries that perform when needed.

It only takes the failure of one battery to compromise the entire battery string. It is often assumed that batteries are meticulously maintained, but this is rarely so. Many batteries are not inspected or maintained beyond an annual UPS service visit. Unknown and undetected battery failures become apparent right at the time when you need the batteries the most – during a mains failure. UPS systems provide only rudimentary battery monitoring.

The UPS cannot identify faults within individual batteries, nor detect an imbalance in the performance of multiple strings. To ensure the integrity of the battery system, it is necessary to detect failing blocks before they affect the performance of the entire system. The effectiveness of a battery monitoring system is proportional to the number of points that are monitored and the frequency that this occurs. With regular monitoring comes the accumulation of data, the ability to report and spot trends, and the ability to take timely remedial action.


  • SENTINEL BATTERY MONITORING Permanent Monitoring for lead-acid and Ni-Cad batteries
  • 24/7 alarm notification.
  • Automatic capture and recording of data during float, charge, discharge & idle.
  • Compatible with float & intermittent charging.
  • Rapid voltage sampling – all batteries simultaneously every 4 seconds.
  • Built in intelligence – battery state recognition & self calibration for reliable impedance.
  • User defined alarm limits.
  • On-board memory.
  • Sealed, vented, Ni-Cd batteries.
  • Flexible to suit battery model & application.
  • Designed to allow IEEE/IEC best practice.
  • Remote reporting service available.
  • WAN/LAN integration for remote monitoring via Link software.
  • RS 232 connection for local battery service and diagnosis.
  • SNMP or Modbus interface to Building Management Systems.
  • Dry contacts for alarm output.


Power supply [10W]: 24V DC Model: 11V to 33Vdc, 0.8A max.
48V DC Model: 20V to 65Vdc, 0.4A max.
72V DC Model: 55V to 140Vdc, 0.15A max.
AC Model 110V to 240Vac, 50/60Hz, 0.15A max.
Battery inputs up to 160 (scaleable to 1280)
Sensor type Measurement Module or m-Senzor
String voltage 2V-1000V
Current inputs up to 5 (scaleable to 16)
Sensor type Hall Effect
Measurement range 0A – 2000A
System accuracy ±1% + sensor accuracy
Maximum distance 15m / 50ft
Temperature inputs (Ambient) up to 5 (scaleable to 16)
Measurement range 0°C to 80°C/32F to 176F
System accuracy ±1°C / 1.8F
Maximum distance 15m/50ft
Digital inputs 4
Relay outputs 4 voltage free
Rating 1.25A @ 24VDC
Selectable Any relay configurable to any alarm
Memory 350,000 data points
Physical dimensions Width: 430mm / 17 inches (19” rack compatible)
Depth: 270mm / 10.6 inches
Height: 45mm / 1.8 inches (1U)
Operating temperature 0°C to 50°C/32F to 122F
Storage temperature 0°C to 70°C/32F to 158F
Service port RS232
Com port 1  (Optional) Primary monitoring connection with option of:
Ethernet – 10Base-T
 Com port 2 (Optional) Building management interface with option of:
RS485 or RS232 interface
Modbus ASCII or Modbus RTU protocol
Modbus TCP
m-SENZOR (Dual and Single input)
Purpose Measures individual monoblock voltage, impedance and temperature
Application VRLA and vented lead acid, Ni-Cad cells
Nominal voltage Ni-Cad ,2V, 6V, 12V
Temperature measurement  range  -4°C to 70°C/24.8F to 158F
Isolation 750V DC
Power supply Powered by monoblock being monitored
Interface to Sentinel PowerShield BBUS II (maximum 150m/492ft per BBUS port)
MEASUREMENT MODULE (Dual and Single input)
Purpose Measures individual monoblock voltage
Application VRLA and vented lead acid
Nominal voltage 2V , 6V, 12V
Isolation 600V DC
Power supply Powered by monoblocks being monitored
Interface to Sentinel PowerShield BBUS (maximum 100m/330ft per BBUS port)