Choosing the right battery discharge tester requires more than comparing maximum voltage and current ratings. Discharge power, operating modes, cell-level monitoring, software control and expansion capability can all affect testing efficiency and the quality of the diagnostic results.
This comparison examines the DV Power BLU500C and the Megger TORKEL 950, two battery discharge testers designed for battery systems up to 500 V DC.
| Comparison Item |
DV Power BLU500C |
Megger TORKEL 950 |
Assessment |
| Maximum battery voltage |
500 V DC |
500 V DC |
Equivalent |
| Maximum discharge power |
20 kW |
15 kW |
BLU500C provides 33.3% more power |
| Rated constant-current range |
0–220 A |
0–220 A |
Broadly equivalent |
| Current in specific voltage bands |
Up to 270 A at 60–72 V; capability varies with voltage |
Up to 220 A, subject to the 15 kW power limit |
BLU500C is stronger in selected voltage bands |
| Theoretical current at 500 V |
40 A |
30 A |
BLU500C provides 33.3% more current |
| Current at 480 V |
40 A |
Approximately 31.25 A |
BLU500C provides about 28% more current |
| Normal operating-voltage lower limit |
5.25 V |
Approximately 2 V with current firmware |
TORKEL 950 operates at a lower voltage without an accessory |
| Discharge to 0 V |
Optional 0 V function with a ZVD module |
No equivalent 0 V solution identified in the cited product data |
BLU500C has an advantage for residual-energy removal |
| Discharge modes |
Constant current, power, resistance and voltage; current, power and resistance profiles |
Constant current, power and resistance; current and power profiles |
BLU500C adds constant-voltage operation |
| Cell-level monitoring |
BVS: cell voltage, intercell voltage and temperature |
BVM: primarily individual cell voltage |
BLU500C provides more diagnostic dimensions |
| Parallel operation |
Up to 10 identical units in master-slave operation |
Multiple TORKEL units or TXL load units can be linked |
Both are expandable |
| PC operation and reporting |
DV-B Win supports test control, monitoring and report export |
TORKEL Viewer supports data management, editing and reporting; PC control is not provided for the 900 series |
BLU500C provides a more complete PC workflow |
| Display |
7-inch color touchscreen |
7-inch capacitive touchscreen |
Equivalent |
| Main-unit weight |
18.9 kg / 41.6 lb |
19.5 kg / 43.0 lb |
BLU500C is 0.6 kg / 1.4 lb lighter |
| User-interface languages |
English and German |
Czech, English, French, German, Romanian, Russian, Spanish and Swedish |
TORKEL 950 offers broader language support |
| Ethernet connectivity |
Optional |
Standard |
TORKEL 950 advantage |
Discharge Power and Current Capability
The most important performance difference is maximum discharge power. The BLU500C is rated at 20 kW, compared with 15 kW for the TORKEL 950. This gives the BLU500C approximately 33.3% more discharge power.
The difference becomes especially relevant when testing high-voltage battery systems. Based on the power ratings, the theoretical current at 500 V is 40 A for the BLU500C and 30 A for the TORKEL 950. At 480 V, the BLU500C can provide 40 A, while the TORKEL 950 is limited to approximately 31.25 A by its 15 kW power ceiling.
Both instruments specify a rated constant-current range of 0–220 A. DV Power also lists a maximum attainable current of 270 A in the 60–72 V range. However, this figure is voltage-dependent and should not be interpreted as a continuous-current rating across the tester’s complete operating range.
Discharge Modes and 0 V Applications
Both products support constant-current, constant-power and constant-resistance discharge testing. The BLU500C additionally supports constant-voltage discharge, providing greater flexibility for applications that require voltage-controlled testing.
For applications involving battery recycling or residual-energy removal, the BLU500C can also be equipped with an optional Zero Voltage Discharge module. This enables controlled discharge toward 0 V. No equivalent 0 V solution was identified in the cited TORKEL 950 product information.
The TORKEL 950 nevertheless has an advantage in standard low-voltage operation. With current firmware, it can operate down to approximately 2 V without an additional accessory, compared with a normal lower operating limit of 5.25 V for the BLU500C.
Cell Monitoring and Diagnostic Information
Battery discharge testing becomes more valuable when the operator can identify weak cells rather than only measuring the overall battery voltage.
DV Power’s BVS system can monitor individual cell voltage, intercell connection voltage and temperature. These additional measurements can help operators evaluate cell behavior, connection condition and thermal performance during a discharge test.
Megger’s BVM system is primarily focused on individual cell-voltage monitoring. It provides essential cell-level data, while the DV Power solution offers a broader set of diagnostic measurements.
PC Control, Reporting and Test Documentation
The BLU500C works with DV-B Win software for remote test control, real-time monitoring and data analysis. Test reports can be exported in XLS, PDF, Word and RTF formats, supporting documentation and record-management workflows.
TORKEL Viewer provides data transfer, management, editing and reporting functions. However, PC-based control of TORKEL 900 Series discharge tests is not provided. Organizations that prioritize remote operation and an integrated software workflow may therefore find the BLU500C more suitable.
Parallel Operation and Expandability
Both systems can be expanded for applications requiring higher discharge current or power.
Up to ten identical BLU500C units can operate in a master-slave configuration without an external total-current measurement device. TORKEL systems can be expanded by connecting additional TORKEL instruments or TXL load units.
Both approaches provide scalability, although DV Power documents a more integrated architecture for coordinating multiple identical load units.
Interface, Connectivity and Portability
Both testers include a 7-inch color touchscreen. The TORKEL 950 uses a capacitive touchscreen and provides a wider selection of interface languages. It also includes Ethernet connectivity as standard, whereas Ethernet is optional on the BLU500C.
The BLU500C weighs 18.9 kg, compared with 19.5 kg for the TORKEL 950. The 0.6 kg difference is modest, but it may still matter for teams that frequently transport test equipment between sites.
Which Battery Discharge Tester Should You Choose?
The DV Power BLU500C is the stronger option when the application prioritizes:
- Higher discharge power at elevated battery voltages
- Constant-voltage discharge testing
- Optional discharge toward 0 V
- Voltage, intercell-voltage and temperature monitoring
- Remote PC control and flexible report export
- Integrated operation of multiple identical load units
The Megger TORKEL 950 may be preferable when the application prioritizes:
- Operation at very low voltage without an accessory
- Standard Ethernet connectivity
- A wider range of user-interface languages
- Compatibility with existing TORKEL or TXL equipment
Conclusion
The BLU500C and TORKEL 950 both support battery discharge testing up to 500 V DC, but their strengths differ. The BLU500C combines 20 kW discharge power with broader operating modes, richer cell diagnostics and more complete PC control. The TORKEL 950 provides lower-voltage operation without an accessory, standard Ethernet and broader language support.
The final selection should be based on the battery voltage range, required discharge current, testing workflow, cell-monitoring requirements and compatibility with existing equipment. Pricing, included accessories, calibration services and local warranty conditions should be confirmed through matched formal quotations.
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