The 300 V 100 A EDR power supply is built for electrodialysis reversal membrane systems that periodically change DC polarity. With 30 kW rated output, air cooling, two fans and a 4.3-inch local panel, it provides a practical reference platform for water desalination and ion-separation skids using an EDR operating sequence.
EDR is not simply another name for ordinary electrodialysis. Electrical direction is intentionally reversed as part of the operating cycle. It is also different from reverse electrodialysis, electrodeionization and bipolar-membrane electrodialysis; those processes have different objectives and system requirements.
Electrical and mechanical reference
| DC output | 300 V / 100 A |
|---|---|
| Rated output power | 30 kW |
| AC input | 380 V or 415 V three-phase |
| Cooling | Air cooled, two fans |
| Local interface | 4.3-inch panel |
| Operating function | Automatic polarity reversal |
| Reference enclosure | W580 x D580 x H690 mm |
| Reference weight | 80 kg |
| Primary control mode | Constant current or constant voltage, selected for the stack |
Selecting power for the membrane stack
Correct current is based on membrane-stack current density and effective membrane area. A useful engineering relationship is current equals current density multiplied by effective area, but the allowable current density should come from the membrane or stack supplier. Feed conductivity, recovery target, temperature and concentration polarization can change the practical operating limit.
Required voltage comes from the complete loaded stack rather than membrane area alone. Number of cell pairs, hydraulic channel design, electrode compartments, electrical connections and the expected polarization curve all contribute. For replacement projects, record both normal and maximum DC voltage under representative water conditions.
Reversal as a coordinated system sequence
The unit can reverse output polarity automatically, but an EDR reversal event may involve more than changing two DC terminals. Depending on plant design, the sequence may include current reduction, a dead-time interval, valve synchronization and direction confirmation. Signals and time values are mapped to the skid controls for the actual project rather than assumed from a generic timer.
Cooling, operation and integration
Air cooling keeps this 30 kW cabinet self-contained where ambient temperature and ventilation are suitable. The local panel supports operation at the rectifier. Remote commands, status contacts, analog references or a communication interface can be added after the controller, signal direction and protocol are identified. Constant-current or constant-voltage operation is selected around the stack strategy.
Custom EDR output range
Custom outputs are available from 1 to 100,000 A and from 1 to 1,000 V. The useful range for an EDR project is narrowed by stack voltage, current-density limit, input power, cooling and cabinet arrangement. This keeps the quotation tied to the membrane system instead of presenting an arbitrary voltage-current combination.
Data to include with an inquiry
- Membrane stack model, effective area and number of cell pairs
- Feed-water conductivity range and normal operating point
- Normal and maximum loaded DC voltage and current
- Reversal interval, ramp or dead-time requirements and valve sequence
- Available three-phase input and required local or remote signals
Frequently asked questions
Is EDR the same as reverse electrodialysis?
No. EDR periodically reverses polarity in a desalination or separation process. Reverse electrodialysis is generally associated with salinity-gradient energy generation.
Does the rectifier automatically control every system valve?
The power supply can participate in a coordinated reversal sequence, but the valve scope and interface must be defined for the skid. It is not treated as a universal default.
Can every membrane stack use 300 V and 100 A?
No. This is one reference rating. Final output must match the stack voltage curve, membrane-area current limit and feed conditions.
Explore electrodialysis power options
See the electrodialysis rectifier category and the adjacent 60 V 800 A brackish-water ED power supply. To size an EDR unit, share the membrane-stack operating window.
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