Holdvolt BM
Battery Online Monitoring System for UPS
Finds the weak cell before an outage does. Per-cell voltage, resistance and temperature, reported over Modbus and Ethernet.
- 300
- Cells per group, max.
- 2 / 6 / 12V
- Cell types
- ±0.1%
- Cell voltage accuracy
Features
2 V / 6 V / 12 V cells
Measures
- Cell voltage
- Internal resistance
- Temperature
- String current
Interfaces
- Modbus
- RS485
- Ethernet
Specifications
Factory catalog values, model by model.
Modules
| Model | BM-C02 | BM-C06 | BM-C12 | BM-C02S | BM-C12S | BM-C02F | BM-C12F | BM-T500 | BM-T1000 | BM-N02 |
|---|---|---|---|---|---|---|---|---|---|---|
| Other | ||||||||||
| Power requirements – TA Module | Powered directly by the monitored batteries. The 2V module draws 7mA under normal operation, with a maximum of 13mA. The 6V and 12V modules draw 3mA under normal operation, with a maximum of 7mA. Current consumption consistency is extremely high among different modules. | |||||||||
| Power requirements – TC Module | DC 8–13V (for Convergence Module power supply), 1W, 1W) | |||||||||
| Power requirements – BM (Convergence Module) | 85–264VAC (standard), DC 48V or DC 110–370V (optional), 15W | |||||||||
| Monitoring capacity | Maximum 300 cells per group. One Convergence Module manages up to six battery groups, with a maximum monitored total of 960 cells. | |||||||||
| Monitoring range | Suitable for 2V, 6V, 12V batteries with capacity less than 3000AH. | |||||||||
| Dielectric withstand voltage | 2000VAC | |||||||||
| Reliability – Automatic restart trigger | Built-in WDT | |||||||||
| Reliability – MTBF | 100,000 hours | |||||||||
| Protection | Dual-level protection for measurement and power circuits. TA modules feature reverse polarity protection and optical isolation. | |||||||||
| Measurement range & accuracy – Group voltage | 20–800V; ±0.5% | |||||||||
| Measurement range & accuracy – Cell voltage | 2 V, 6 V, 12 V; ±0.1% | |||||||||
| Measurement range & accuracy – Cell internal resistance | 50–65535uΩ; ±2% with a resolution of 1 μΩ | |||||||||
| Measurement range & accuracy – Negative electrode temperature | -5°C–+99.9°C; ±1°C | |||||||||
| Measurement range & accuracy – Charge and discharge current | 0–1000A(Standard Configuration); ±1% | |||||||||
| Measurement range & accuracy – Ambient temperature | -5°C–+99.9°C; ±1°C | |||||||||
| Optional accessories | BM-D0 monitoring unit with 5.6-inch touch screen; BM-S01 standalone monitoring software; BM-ND01 network monitoring software (SQL database required) | |||||||||
| Note | One system (one convergence module plus TA/TC modules) monitors one standalone UPS or one group of paralleled UPS units. | |||||||||
| Display & communication | ||||||||||
| Communication interface – BM Module | UART port supporting MODBUS protocol. Each UART bus supports up to 130 devices. | |||||||||
| Communication interface – CM Convergence Module | Equipped with RS485 and 10/100M Ethernet ports, supporting MODBUS/RTU, MODBUS/TCP and SNMP protocols. | |||||||||
| Environment | ||||||||||
| Operating temperature | -10°C–65°C | |||||||||
| Relative humidity | 5%–90% RH | |||||||||
| Atmospheric pressure | 80–110kPa | |||||||||
| Physical | ||||||||||
| Installation – BM-TA Module / New TC Module | Directly attached to batteries or mounted on fixing strips. | |||||||||
| Installation – Convergence Module | Fixed on 19-inch cabinets or battery racks. | |||||||||
| Weight – BM-TA Module | 80g | |||||||||
| Weight – TC Module | 75g | |||||||||
| Weight – CM Convergence Module | 1800g | |||||||||
Factory values. Specifications may change; confirm against the quotation.Swipe the table sideways.
Where it fits
Applications and guides for this range.
Power Substations
Relays, SCADA, RTUs and communication equipment in a substation need clean AC power when station supply is disturbed. Our P-series power utility UPS is built for that control-room duty.
ApplicationData Centers
Data center power has to grow with the racks and stay up while you service it. We supply modular, rack-mount and lithium-ion online UPS systems from server room to full data hall.
Questions buyers ask
What do you need for a quotation?
Load in kVA or kW, input voltage and phases, output phases, the backup time you need and where the unit will be installed. If you are unsure, send what you know and we will ask for the rest.
Can the unit carry our brand?
Yes. Logo, front panel, packaging and manual can be supplied under your brand. Minimum quantities and lead times are on the OEM / ODM page.
More in Batteries & Monitoring
Five numbers get you a quote
Send what you know. We reply within one working day.
- LoadkVA or kW, and what it is
- Input voltage and phasese.g. 400 V three-phase, 50 Hz
- Output phasesSingle- or three-phase
- Backup timeMinutes at full or typical load
- SiteIndoor, temperature, altitude, generator