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Technical specification

Cellwatch is a state-of-the-art battery monitoring system designed specifically for large (three-phase) UPSs. It utilizes the latest fiber optic technology to provide rapid, noise-free transmission of information on battery health. The modular system continuously monitors the entire battery system, including string and cell level voltage; ohmic value; current; and temperature throughout the charge, discharge and float periods.

Control Unit (CU) / Thermal Runaway Controller (TRC)

Operating specifications

Operating temperature
0–50°C (32–122°F)
Storage temperature
-10–80°C (15–175°F)
Power supply
110–240 VAC
Power supply frequency
50–60 Hz
Power supply rating
Max. 20 Watts


RS-485 interface
With optional jumper for termination
Max. range
2,000 ft (619m) total bus length
Fiber optic range
150 ft (50m) CU to DCM, DCM to DCM
Max. CUs / TRCs per RS-485 bus

Battery Monitoring Unit (iBMU)

Computer characteristics

Operating system 
Microsoft Windows 10 IoT Enterprise LTSB 2016 or Microsoft Windows 7 embedded
Cellwatch applications ModbusT TCP / IP SNMP v1
Hard drive
30 GB solid state
Operating temperature 
0–40°C (32–104°F)

Physical characteristics

Dimensions (H x W x D)
3.5 (2U) x 19 x 12 in (88.9 x 482.6 x 304.8 mm)
Enclosure material 
Steel with powder coating
19 in (482.6 mm) rack with optional wall mount kit

Data collection module 5

Voltage measuring characteristics

Voltage measuring range
2 mV
0.1% ±5 mV

Physical characteristics

Dimensions (H x W x D)
3.1 x 4.2 x 0.90 in (78.7 x 106.7 x 22.9 mm)
Mounting pads (mounting plates and din rail mounting optional)
2 in (50.8 mm) 3M dual lock
Enclosure material
Flame retardant ABS

Generator extender kit


Operating voltage
Operating temperature
0–50°C (32–120°F)
Storage temperature
0–80°C (32–176°F)
Proprietary over CAT5 cable
Max. range
4,000 ft (1219m)
Fiber optic range
150 ft (50m) remote to DCM, DCM to remote

Dimensions (H x W x D)

2.63 x 4.50 x 1 in (65 x 110 x 26 mm)
Integrated into CU and TRC

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