Modular system that watches every cell of the bank during capacity and charging tests
Supervising every cell voltage during a capacity or charging test of a stationary bank, and locating the cells or connections that fail, calls for a cell-by-cell monitoring system that records in real time. BVS does it with modules spread along the bank and a control unit: cell voltage up to ±30 V with 1 mV resolution and ±(0.1 % of reading + 0.1 % of full scale) typical accuracy, inter-cell voltage up to ±50 mV with 1 µV resolution, string voltage up to ±600 V and sampling down to 1 s, with an LED alert on the module itself for every out-of-tolerance value.
BVS key data
- Versions: BVS, with one module per cell that also measures the inter-cell voltage; and BVS-4, with four cells per module, fewer modules and less wiring on large banks.
- Cell voltage: ±30 V range, 1 mV resolution and ±(0.1 % of reading + 0.1 % of full scale) typical accuracy.
- Inter-cell voltage (BVS): ±50 mV range, 1 µV resolution and ±(1 % of reading + 1 % of full scale) typical accuracy, to detect degraded connections.
- String: optional SVM voltage module up to ±600 V (1 mV resolution, ±(0.1 % + 0.1 %) typical accuracy) and SCM clamp-based current module; with them BVS automates the capacity test with any load bank.
- Temperature and logging: four ambient temperature channels on the control unit, optional cell temperature probe, internal 2 GB SD memory and sampling down to 1 s depending on the number of modules.
- Reliability: internal RS485 bus where the failure of one module does not interrupt the others; LEDs on every module for out-of-tolerance values, so the degraded cell is bypassed without stopping the test.
- Connection and power: USB or Bluetooth to PC; 90–264 V AC and 110 VA; 180 × 205 × 63 mm, 0.78 kg control unit.
Advantages
Modular and scalable
A control unit powers and polls over RS485 the cell voltage modules spread along the bank; optional string voltage and string current modules complete the picture of the whole.
Two versions to match the bank
In the BVS version each module measures one cell — including the inter-cell voltage — and in the BVS-4 each module handles four cells, with fewer modules and less wiring.
Faults located instantly
Out-of-tolerance values are flagged with LEDs on the module itself, so the degraded cell is identified and bypassed without stopping the rest of the test.
Robust by design
The failure of one module does not interrupt the communication of the others, and the control unit adds four ambient temperature channels and an internal 2 GB SD memory.
Applications
- Capacity tests of stationary banks with cell-by-cell supervision.
- Voltage monitoring during charging and recharging.
- Detection of degraded cells and inter-cell connections.
- Automated tests together with the discharge unit or any load bank.
- Substations, UPS, telecom and power plants.
About the product
Cell voltage is measured up to ±30 V with 1 mV resolution; inter-cell voltage up to ±50 mV with 1 µV; and the optional modules reach ±600 V of string voltage. Data travels to the PC over USB or Bluetooth and the PC software presents it next to the discharge unit results in a single report.
Accessories: CVM or CVM-4 cell voltage modules, SVM string voltage module, SCM string current module and optional cell temperature probes.
Technical specifications
| Versions | BVS (1 cell per module); BVS-4 (4 cells per module) |
| Cell voltage | ±30 V; 1 mV resolution |
| Inter-cell voltage (BVS) | ±50 mV; 1 µV resolution |
| String (optional modules) | ±600 V and clamp-based current |
| Sampling | Down to 1 s, depending on the number of modules |
| Communication | Internal RS485; USB or Bluetooth to PC |
| Power supply | 90 – 264 V AC; 110 VA |
| Control unit | 180 × 205 × 63 mm; 0.78 kg |
| Typical accuracy (cell and string) | ±(0.1 % rdg + 0.1 % FS) on ±30 V and ±600 V |
| Typical accuracy (inter-cell) | ±(1 % rdg + 1 % FS) on ±50 mV |
Frequently asked questions
How do you detect a weak cell during a battery bank capacity test?
By measuring the voltage of every cell throughout the discharge and comparing it with the tolerance. BVS records each cell up to ±30 V with 1 mV resolution and ±(0.1 % of reading + 0.1 % of full scale) typical accuracy, flags out-of-tolerance values with an LED on the module itself and lets the degraded cell be bypassed without stopping the test.
How are inter-cell connections checked during the discharge?
By measuring the voltage across each connection while the discharge current flows. In the BVS version each module measures the inter-cell voltage up to ±50 mV with 1 µV resolution and ±(1 % of reading + 1 % of full scale) typical accuracy, so a degraded connection stands out from the rest.
What is the difference between the BVS and the BVS-4?
The number of cells per module: one on the BVS, which also measures the inter-cell voltage, and four on the BVS-4, which simplifies installation on large banks.
Does it work with any discharge equipment?
Yes. With the optional string voltage and current modules, the system automates the capacity test with any load bank on the market.
What happens if a module fails mid-test?
Nothing beyond losing that measuring point: the communication of the remaining modules with the control unit continues uninterrupted.
How are faulty cells identified?
Each module flags out-of-tolerance values with LEDs and the software marks the cell, which can be safely bypassed during the discharge.
Does it measure temperature too?
Yes. The control unit offers four ambient temperature channels and the modules accept an optional cell temperature probe.
