The MegaEIS™ ME-42SL420x200 is a highly versatile, bi-directional workstation engineered for advanced testing of fuel cells, electrolyzers, and battery modules. Featuring a combined source/load architecture, it handles up to 420 A and 200 V with a maximum power capacity of 30 kW.

With 42 fully synchronized measuring channels, the system delivers true parallel EIS data across the entire assembly. This enables continuous charge and discharge cycling without switching hardware, capturing real-time impedance shifts even under aggressive dynamic loads.

Key features

Designed for advanced fuel cell stack, electrolyzer, and battery module R&D

Bi-directional source/load architecture for continuous charge/discharge cycling

Stack current up to ±420 A

Stack voltage up to 200 V

Maximum power capacity up to 30 kW

EIS measurement one cell gradually or all cells simultaneously

High-precision current sensing of both DC and AC components

Technical specifications

Power supply: 110 … 240 V AC / 50 … 60 Hz

Dimensions: Modular design for 19“ rack cabinet; 125 kg

Input voltage: 0 … 200 V

Total input current: Up to 420 A

Max. internal power dissipation: 30 kW

Sampling:

24-bit ADCs, low-noise 50/60 Hz filtered sampling
Up to 1.25 Msps for EIS measurements

Measurement resolution: 0.001% of selected range

Accuracy

Voltage: ≤ 0.1% of range + 0.1% of reading
Current: ≤ 0.1% of range + 0.5% of reading

EIS frequency: 1 mHz ... 100 kHz

EIS amplitude: Up to 20% of maximum internal current for < 1 kHz

2× voltage probe with EIS: Up to ± 200 V

EIS channel voltage range: ± 5 V (max. voltage span over one EVM8 module: 24 V / each 8 channels)

Number of EIS channels: Up to 40+2 (limited by max. voltage)

8 channels per one EVM8 module

Connection: USB 2.0, Ethernet

Software

Control software for MS Windows
Features: measurement setup and control, data acquisition, processing and visualization, Pascal or Python scripting, remote control by TCP/IP server for integration with top-level control system, examples for remote control using Python or LabVIEW.

Use cases

Dynamic Battery Module Cycling: Execute aggressive charge/discharge profiles on Li-ion or redox-flow battery modules. True parallel EIS captures state-of-health (SoH) variations across all 42 cells simultaneously during active operation, eliminating multiplexing delays and the need for manual probe reconnection.

Reversible Fuel Cell (rSOC) Validation: Seamlessly test solid oxide or other fuel cell stacks (PEMFC, AFC, MCFC, PAFC). The bi-directional architecture allows you to run continuous cyclic profiles, capturing real-time impedance shifts to identify degradation mechanisms under alternating power generation and electrolysis loads.

High-Current Transient Diagnostics: Measure both AC and DC currents with absolute accuracy during extreme 420 A power surges. By utilizing a unique low-impedance current sensor placed in series with the external booster, the system eliminates parasitic effects, delivering clean, precise data with 0.1% accuracy at 1.25 Msps.

MegaEIS™ ME-42SL420x200 – Bi-Directional Workstation for Fuel Cells, Electrolyzers & Batteries