Bidirectional · Regenerative · Programmable
DC power that flows both ways.
One instrument sources, sinks and regenerates — from battery packs to PV strings to grid-scale converters. Tier-1 performance, without the Tier-1 price.
0–2250 V · up to 42 kW in 3U · scalable to MW · 93% regen
One box replaces four
Source, sink, simulate — in a single unit
A bidirectional DC supply, a regenerative load, a battery simulator and a solar array simulator — consolidated, automation-ready, and engineered to recover energy instead of burning it.
Bidirectional & regenerative
One instrument sources and sinks current with seamless dual-quadrant crossover — and returns absorbed energy to the grid at up to 93% efficiency.
Top-tier density
Up to 42 kW in a 3U chassis, 0–2250 V across six voltage classes, and master/master parallel that scales to megawatt systems.
Lab-grade accuracy
0.02% + 0.02% F.S. voltage accuracy and ≤5 ms dynamic response, with CC / CV / CP / CR modes and CC&CV priority.
Battery & PV simulation
Built-in battery simulation (7 model libraries + custom curves) and PV array I-V/P-V simulation with EN50530 and Sandia profiles.
Automation-ready
LAN / RS232 / RS485 / CAN standard, with SCPI, Modbus-RTU and CANopen for ATE integration out of the box.
Engineered to be trusted
ISO 17025-traceable calibration, CE / IEC 61010 safety, PF 0.99, and full OVP/OCP/OPP/UVP/UCP protection.
Seamless source ⇄ sink
Watch it cross quadrants without overshoot
Charge and discharge in one continuous profile. The N35500 transitions between sourcing and sinking in ≤5 ms, with 0.02% F.S. accuracy and CC/CV/CP/CR control — and returns the absorbed energy to the grid at up to 93%.
The platform
Six voltage classes, 14 kW to MW
One architecture from 360 V to 2250 V. Pick a class, scale the power, parallel to megawatts.
360 V360 V Bidirectional DC Supply
14–420 kW · 93% regen · ±2400 A
High-current 360 V class for low-voltage, high-amperage pack and module test.
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500 V500 V Bidirectional DC Supply
14–420 kW · 93% regen · ±1950 A
500 V class for 400 V-architecture EV packs, DC-DC and motor-drive test.
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750 V750 V Bidirectional DC Supply
14–420 kW · 93% regen · ±1950 A
750 V class for 800 V EV architectures, chargers and traction inverters.
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1000 V1000 V Bidirectional DC Supply
28–280 kW · 93% regen · ±650 A
1000 V class for high-voltage EV packs, ESS strings and DC fast charging.
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1500 V1500 V Bidirectional DC Supply
22–420 kW · 93% regen · ±650 A
Flagship 1500 V class for utility PV strings, BESS and grid-scale converters.
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2250 V2250 V Bidirectional DC Supply
22–420 kW · 93% regen · ±650 A
Highest 2250 V class for long PV strings and high-voltage power-electronics test.
View class →Capabilities
Four instruments, one chassis
Bidirectional & Regenerative
Dual-quadrant source + regenerative load in one unit; recovers energy to the grid at 93%.
Regenerative DC Load
Sink and cycle power without the heat — CC/CV/CP/CR with energy recovery instead of dissipation.
Battery Simulator
Emulate cells and packs with 7 model libraries plus custom measured curves; SoC/OCV control.
Solar Array Simulator
Generate PV I-V / P-V curves with EN50530 static & dynamic and Sandia MPPT profiles.
Scale without limits
From a 3U benchtop to a megawatt cabinet
Master/Master paralleling grows the same platform from 14 kW to MW-class systems — for full battery packs, ESS strings and grid-scale converters — with one control interface and SCPI / Modbus-RTU / CANopen automation.
Applications
Built for the test that matters
EV & Battery Pack Test
Charge/discharge cycling, BOBC, DC-DC and pack validation with regenerative recovery.
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Battery Cell Cycling
High-throughput cell and module cycling with precise SoC and low energy cost.
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PV / Solar Inverter Test
Solar array simulation to 2250 V with EN50530 / Sandia dynamic MPPT efficiency tests.
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Fuel Cell / Hydrogen
Source and sink for PEM fuel-cell stack characterisation and profile testing.
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Energy Storage (ESS/PCS)
Bidirectional cycling for PCS, BESS and grid-tie converters, IEEE 1547-ready.
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UPS Test
Battery-side and DC-bus emulation for UPS and backup-power validation.
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Motor Drive
DC-bus supply and regenerative braking energy recovery for drive and inverter test.
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EV Charger (BOBC)
Emulate vehicle and grid side for DC fast chargers, OBC and bidirectional BOBC test.
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Aerospace & ATE
Programmable, automation-ready DC for satellite solar simulation and ATE racks.
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Behave like a battery. Behave like the sun.
The regen advantage
Recover up to 93% — instead of cooling it away
A regenerative load returns absorbed energy to the grid rather than dissipating it as heat — so on continuous cycling you spend less on power, less on cooling, and less over the instrument's life.
Energy recovered
Absorbed power is returned to the grid instead of burned off as heat.
Cooling load
Far less HVAC and rack-cooling demand during high-power, continuous test.
Cost of ownership
A smaller energy bill over thousands of charge/discharge cycles.
Engineered to the standards your buyers expect
Tell us the test. We will spec the power.
Send your voltage, power, application and timeline — get a configured quote with application-engineering support.