N35100 – Bidirectional Low-Voltage DC Power Supply up to 7.5 kW

For low-voltage battery and DC/DC converter testing with source, load and simulation modes in 1U.

The N35100 series combines a programmable DC source with a regenerative electronic load. Its two-quadrant operation enables seamless current reversal. A wide operating range covers different voltage and current combinations within the rated power of each model, supporting changing requirements in laboratories and test systems.

Control matched to the DUT

CC/CV priority and adjustable voltage and current slew rates help tailor startup and transitions to different devices under test.

Repeatable test sequences

SEQ profiles and charge/discharge functions execute defined test routines with configurable setpoints and termination conditions.

Digital test integration

LAN, RS232, RS485 and CAN are standard interfaces for remote control and integration into automated test setups.

Battery and PV simulation

NS81000 adds battery characteristic curves; optional PV simulation with NS91000 provides I-V and P-V curves for inverter testing.

Personal project consultation

Do you need support selecting the right power supply? Our technical specialists will provide personal advice tailored to your application.

+49 6205 3948-0 info@et-system.de

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Product variants

N35100 bidirectional DC power supply overview

The N35100 bidirectional DC power supply powers devices under test and absorbs returned electrical energy. In sink operation, this energy is fed back into the supply grid, reducing energy consumption and heat dissipation compared with a purely dissipative load. The model family comprises 2.5, 5 and 7.5 kW power ratings with voltage variants for 40, 80 and 300 V. Voltage, current and power jointly define the available operating point.

The 40 V and 80 V versions occupy just 1U; the N35125-80-55 uses a half-width 19-inch chassis. The series is operated through a 3.2-inch colour display, keys and a rotary encoder, or by remote control. Programmable sequences, separate source/sink limits and complementary simulation software support battery, converter and drive testing.

Key benefits

Bidirectional energy flow

Source and sink functions share one instrument, allowing changing energy flows without rewiring between a separate source and load.

Wide operating range

Different voltage and current combinations use the same power rating. Select the model for the actual operating point.

Sense voltage at the DUT

Four-wire remote sensing compensates for lead voltage drops and supports a defined supply voltage at the DUT terminals.

Link test profiles

Up to ten sequence files with 1,000 steps each can run cyclically and link to subsequent files.

Integrate external signals

Analogue programming and digital status signals connect electrical setpoints, output control and test-system sequences.

Emulate battery behaviour

Internal resistance simulation and software-based battery curves enable tests under defined electrical supply conditions.

Operating principle: source and regenerative load

The output voltage remains positive while current can flow in either direction. In source operation, the instrument supplies energy; in sink operation, it absorbs and regenerates energy. Positive current and power readings indicate source operation, while negative values indicate sink operation.

V/I operation provides voltage regulation with separate source and sink current and power limits. Load operation offers CC, CV, CR and CP for constant current, voltage, resistance or power loading.

Power range and model selection

Model	Voltage range	Source/sink current	Source/sink power
N35125-40-100	0–40 V	±100 A	±2.5 kW
N35150-40-200	0–40 V	±200 A	±5 kW
N35175-40-300	0–40 V	±300 A	±7.5 kW
N35125-80-55	0–80 V	±55 A	±2.5 kW
N35150-80-110	0–80 V	±110 A	±5 kW
N35175-80-170	0–80 V	±170 A	±7.5 kW
N35125-300-25	0–300 V	±25 A	±2.5 kW
N35150-300-50	0–300 V	±50 A	±5 kW
N35175-300-75	0–300 V	±75 A	±7.5 kW

Maximum voltage and maximum current are not fully available simultaneously. P = U × I applies. Within the permitted operating curve and for U > 0, available current is limited by I = min(I-rated, P-rated/U). The minimum operating voltage in load mode must also be observed.

Example N35175-80-170: At 80 V, the power limit allows up to 93.75 A. The rated current of 170 A is available only up to approximately 44.12 V within the 7.5 kW limit.

Dynamic response, control and measurement

CC/CV priority adapts transitions to the DUT: CV priority supports controlled voltage delivery, for example to DC/DC modules; CC priority suits low-impedance DUTs and battery charging. Adjustable voltage and current slew rates and control-loop speeds allow tuning to the test setup.

Parameter	40 V and 80 V models
Voltage: setting/readback resolution	1 mV
Voltage: setting accuracy / readback accuracy	0.02% + 0.02% F.S. / ≤0.02% + 0.02% F.S.
Current: setting/readback resolution	1 mA
Current: setting accuracy / readback accuracy	0.1% + 0.1% F.S. / ≤0.1% + 0.1% F.S.
Voltage rise, 10–90%	≤10 ms at no load; ≤30 ms at full load

Accuracy specifications apply at 23 ±5 °C. Precision measurements require 30 minutes of warm-up, calibration within the previous year and relative humidity up to 80%. F.S. denotes the respective full-scale value.

Operating modes and programmable functions

Function	Operation and benefit
SEQ routines	Ten files, up to 1,000 steps per file; voltage, source/sink current and source/sink power setpoints, dwell times, slew rates and file linking.
Charge / discharge	Charging with voltage and current settings; discharging with current and power settings. Termination criteria include voltage, current, capacity and time, depending on the mode.
Internal resistance simulation	Output voltage follows Vo = Vs − Io × Ri. An adjustable series resistance emulates the load-dependent voltage drop of a battery.
Automotive profiles	Selectable vehicle electrical-system profiles for voltage dips, resets and starting, plus LV124 E-04 and E-07. Each profile must remain within voltage, current, power and dynamic limits.
Step, Wave and AnyWave	PC software supports steps, time-based curves, and sine, triangle and pulse profiles. Achievable waveforms depend on amplitude, frequency and instrument bandwidth.

Typical applications

Batteries and energy storage

Test batteries and storage systems for portable applications and UPS using defined charge/discharge parameters; regenerate energy during sink operation.

DC/DC converter testing

Provide a controlled supply to converter inputs or defined loading of converter outputs. CC/CV priority and load modes support the requirements of each test side.

Motor controllers and drives

Supply the DC side of motor controllers and inverters and absorb returned energy within the selected model’s operating range.

Automotive electronics and electrical systems

Reproduce supply changes using SEQ and automotive profiles, for example for startup and reset tests on vehicle electrical components.

PV inverter testing

Use optional NS91000 simulation to apply defined I-V and P-V curves to the DC input and evaluate static and dynamic MPPT behaviour.

Battery-powered drone components

Provide a repeatable electrical supply to battery-powered components; NS81000 adds simulation of different battery characteristic curves.

Interfaces, software and automation

Equipment	Function and scope
LAN / RS232 / RS485 / CAN	Standard interfaces for remote control and integration.
SCPI / Modbus-RTU / CANopen	Supported communication protocols; configure the connection and protocol for the selected controller.
Analogue and digital I/O	Analogue programming and monitoring with 0–5 V or 0–10 V; digital output enable control, fault indication and interlock function.
N35100 PC software	Parameter configuration, test routines, graph display and historical measurement-data logging over LAN.
NS81000	Complementary battery simulation software with seven standard battery models and two custom characteristic-curve types.
NS91000	Optional PV simulation with static and dynamic Sandia/EN50530 profiles, plus weather and shading scenarios.

Scaling through parallel operation

For higher current and power, the series supports master/slave parallel operation with up to ten instruments of the same specification. One instrument acts as master; slaves receive unique addresses. Voltage remains within the range of a single instrument.

Plan the parallel connection, suitable communication cables and instrument configuration together. With remote sensing in a parallel system, the master measures voltage at the compensation point. Optical parallel cables are available as accessories.

Installation and infrastructure

Item	Configuration
N35125-80-55	1U, half-width 19-inch chassis; 214 × 540 mm (W × D, including output shield); approximately 5.1 kg; 220 V AC ±10%.
Other 40 V / 80 V models	1U, 19-inch format; 428 × 711.2 mm (W × D, including output shield); three-phase 380 V AC ±10% with protective earth.
Supply frequency	47–63 Hz
Operating conditions	0–40 °C; 5–90% relative humidity, non-condensing; altitude below 2,000 m.
Connections and cooling	Size the supply connection according to the instrument marking. Select power leads for the voltage and current, and keep air inlets and outlets clear.

Protection functions

OVP, OCP and OPP monitor overvoltage, overcurrent and overpower; UVP and UCP add undervoltage and undercurrent monitoring. Configurable thresholds and delays adapt monitoring to the test sequence. A triggered protection switches off the output and displays an alarm. Overtemperature protection is also integrated.

The configurable I/O interlock inhibits the output when the external contact opens. Interlock settings, wiring and the overall safety concept must be coordinated for the test system.

Frequently asked questions about the N35100 series

Can the N35100 source and sink current?

Yes. The series combines a DC source and a regenerative load with positive output voltage. Current and power can flow in either direction.

Are maximum voltage and maximum current available simultaneously?

Only if voltage multiplied by current stays within rated power. The N35175-80-170 allows a maximum of 93.75 A at 80 V within 7.5 kW.

When is CC priority useful?

For low-impedance DUTs and battery charging, CC priority supports a controlled current rise. CV priority is available for voltage-sensitive supply tasks.

How are repeatable profiles stored?

SEQ provides up to ten files with 1,000 steps each. Voltage, source/sink limits, dwell times and slew rates can be configured per step.

Is PV simulation included as standard?

PV simulation with NS91000 is optional. The software reproduces I-V and P-V curves and static and dynamic test scenarios.

Can batteries be charged and discharged?

Yes. Charge and discharge functions provide defined setpoints and termination criteria. The battery and test profile must match the model’s voltage, current and power ranges.

Is the series suitable for DC/DC converter testing?

Yes. It can supply the input side or load the output side. Select the control priority and operating mode for the specific test task.

Can a PV inverter’s MPPT behaviour be tested?

Yes. Optional NS91000 PV simulation generates static and dynamic characteristic curves at the DC input. The selected model must cover the required operating point.

Technical consultation and project enquiry

Tell us your voltage range, source and sink current, power at the operating point, test profiles and interfaces. We support model selection, simulation software, parallel configuration and integration into your test system.

Discuss your N35100 project with ET System

Downloads

N35100 bidirectional DC power supply overview

Key benefits

Bidirectional energy flow

Source and sink functions share one instrument, allowing changing energy flows without rewiring between a separate source and load.

Wide operating range

Different voltage and current combinations use the same power rating. Select the model for the actual operating point.

Sense voltage at the DUT

Four-wire remote sensing compensates for lead voltage drops and supports a defined supply voltage at the DUT terminals.

Link test profiles

Up to ten sequence files with 1,000 steps each can run cyclically and link to subsequent files.

Integrate external signals

Analogue programming and digital status signals connect electrical setpoints, output control and test-system sequences.

Emulate battery behaviour

Internal resistance simulation and software-based battery curves enable tests under defined electrical supply conditions.

Operating principle: source and regenerative load

V/I operation provides voltage regulation with separate source and sink current and power limits. Load operation offers CC, CV, CR and CP for constant current, voltage, resistance or power loading.

Power range and model selection

Model	Voltage range	Source/sink current	Source/sink power
N35125-40-100	0–40 V	±100 A	±2.5 kW
N35150-40-200	0–40 V	±200 A	±5 kW
N35175-40-300	0–40 V	±300 A	±7.5 kW
N35125-80-55	0–80 V	±55 A	±2.5 kW
N35150-80-110	0–80 V	±110 A	±5 kW
N35175-80-170	0–80 V	±170 A	±7.5 kW
N35125-300-25	0–300 V	±25 A	±2.5 kW
N35150-300-50	0–300 V	±50 A	±5 kW
N35175-300-75	0–300 V	±75 A	±7.5 kW

Example N35175-80-170: At 80 V, the power limit allows up to 93.75 A. The rated current of 170 A is available only up to approximately 44.12 V within the 7.5 kW limit.

Dynamic response, control and measurement

Parameter	40 V and 80 V models
Voltage: setting/readback resolution	1 mV
Voltage: setting accuracy / readback accuracy	0.02% + 0.02% F.S. / ≤0.02% + 0.02% F.S.
Current: setting/readback resolution	1 mA
Current: setting accuracy / readback accuracy	0.1% + 0.1% F.S. / ≤0.1% + 0.1% F.S.
Voltage rise, 10–90%	≤10 ms at no load; ≤30 ms at full load

Operating modes and programmable functions

Function	Operation and benefit
SEQ routines	Ten files, up to 1,000 steps per file; voltage, source/sink current and source/sink power setpoints, dwell times, slew rates and file linking.
Charge / discharge	Charging with voltage and current settings; discharging with current and power settings. Termination criteria include voltage, current, capacity and time, depending on the mode.
Internal resistance simulation	Output voltage follows Vo = Vs − Io × Ri. An adjustable series resistance emulates the load-dependent voltage drop of a battery.
Automotive profiles	Selectable vehicle electrical-system profiles for voltage dips, resets and starting, plus LV124 E-04 and E-07. Each profile must remain within voltage, current, power and dynamic limits.
Step, Wave and AnyWave	PC software supports steps, time-based curves, and sine, triangle and pulse profiles. Achievable waveforms depend on amplitude, frequency and instrument bandwidth.

Typical applications

Batteries and energy storage

Test batteries and storage systems for portable applications and UPS using defined charge/discharge parameters; regenerate energy during sink operation.

DC/DC converter testing

Provide a controlled supply to converter inputs or defined loading of converter outputs. CC/CV priority and load modes support the requirements of each test side.

Motor controllers and drives

Supply the DC side of motor controllers and inverters and absorb returned energy within the selected model’s operating range.

Automotive electronics and electrical systems

Reproduce supply changes using SEQ and automotive profiles, for example for startup and reset tests on vehicle electrical components.

PV inverter testing

Use optional NS91000 simulation to apply defined I-V and P-V curves to the DC input and evaluate static and dynamic MPPT behaviour.

Battery-powered drone components

Provide a repeatable electrical supply to battery-powered components; NS81000 adds simulation of different battery characteristic curves.

Interfaces, software and automation

Equipment	Function and scope
LAN / RS232 / RS485 / CAN	Standard interfaces for remote control and integration.
SCPI / Modbus-RTU / CANopen	Supported communication protocols; configure the connection and protocol for the selected controller.
Analogue and digital I/O	Analogue programming and monitoring with 0–5 V or 0–10 V; digital output enable control, fault indication and interlock function.
N35100 PC software	Parameter configuration, test routines, graph display and historical measurement-data logging over LAN.
NS81000	Complementary battery simulation software with seven standard battery models and two custom characteristic-curve types.
NS91000	Optional PV simulation with static and dynamic Sandia/EN50530 profiles, plus weather and shading scenarios.

Scaling through parallel operation

Installation and infrastructure

Item	Configuration
N35125-80-55	1U, half-width 19-inch chassis; 214 × 540 mm (W × D, including output shield); approximately 5.1 kg; 220 V AC ±10%.
Other 40 V / 80 V models	1U, 19-inch format; 428 × 711.2 mm (W × D, including output shield); three-phase 380 V AC ±10% with protective earth.
Supply frequency	47–63 Hz
Operating conditions	0–40 °C; 5–90% relative humidity, non-condensing; altitude below 2,000 m.
Connections and cooling	Size the supply connection according to the instrument marking. Select power leads for the voltage and current, and keep air inlets and outlets clear.

Protection functions

The configurable I/O interlock inhibits the output when the external contact opens. Interlock settings, wiring and the overall safety concept must be coordinated for the test system.

Frequently asked questions about the N35100 series

Can the N35100 source and sink current?

Yes. The series combines a DC source and a regenerative load with positive output voltage. Current and power can flow in either direction.

Are maximum voltage and maximum current available simultaneously?

Only if voltage multiplied by current stays within rated power. The N35175-80-170 allows a maximum of 93.75 A at 80 V within 7.5 kW.

When is CC priority useful?

For low-impedance DUTs and battery charging, CC priority supports a controlled current rise. CV priority is available for voltage-sensitive supply tasks.

How are repeatable profiles stored?

SEQ provides up to ten files with 1,000 steps each. Voltage, source/sink limits, dwell times and slew rates can be configured per step.

Is PV simulation included as standard?

PV simulation with NS91000 is optional. The software reproduces I-V and P-V curves and static and dynamic test scenarios.

Can batteries be charged and discharged?

Yes. Charge and discharge functions provide defined setpoints and termination criteria. The battery and test profile must match the model’s voltage, current and power ranges.

Is the series suitable for DC/DC converter testing?

Yes. It can supply the input side or load the output side. Select the control priority and operating mode for the specific test task.

Can a PV inverter’s MPPT behaviour be tested?

Yes. Optional NS91000 PV simulation generates static and dynamic characteristic curves at the DC input. The selected model must cover the required operating point.

Technical consultation and project enquiry

Discuss your N35100 project with ET System

Downloads "N35100"

Get in touch with us

+49 (0) 6205 - 3948-0 info@et-system.de

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N35100 – Bidirectional Low-Voltage DC Power Supply up to 7.5 kW

For low-voltage battery and DC/DC converter testing with source, load and simulation modes in 1U.

Personal project consultation

Description

N35100 bidirectional DC power supply overview

Key benefits

Bidirectional energy flow

Wide operating range

Sense voltage at the DUT

Link test profiles

Integrate external signals

Emulate battery behaviour

Operating principle: source and regenerative load

Power range and model selection

Dynamic response, control and measurement

Operating modes and programmable functions

Typical applications

Batteries and energy storage

Interfaces, software and automation

Scaling through parallel operation

Installation and infrastructure

Protection functions

Frequently asked questions about the N35100 series

Can the N35100 source and sink current?

Are maximum voltage and maximum current available simultaneously?

When is CC priority useful?

How are repeatable profiles stored?

Is PV simulation included as standard?

Can batteries be charged and discharged?

Is the series suitable for DC/DC converter testing?

Can a PV inverter’s MPPT behaviour be tested?

Technical consultation and project enquiry

Product variants

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N35100 bidirectional DC power supply overview

Key benefits

Bidirectional energy flow

Wide operating range

Sense voltage at the DUT

Link test profiles

Integrate external signals

Emulate battery behaviour

Operating principle: source and regenerative load

Power range and model selection

Dynamic response, control and measurement

Operating modes and programmable functions

Typical applications

Batteries and energy storage

Interfaces, software and automation

Scaling through parallel operation

Installation and infrastructure

Protection functions

Frequently asked questions about the N35100 series

Can the N35100 source and sink current?

Are maximum voltage and maximum current available simultaneously?

When is CC priority useful?