Seven battery types
Predefined models are available for LiFePO4, ternary lithium, lead-acid, Ni-MH, LTO, ICO and IMO batteries.
NS81000 – Battery Simulation Software with Seven Standard Models
For reproducible charge, discharge and cycle testing with bidirectional DC power supplies.
An internal resistance model links state of charge, open-circuit voltage and internal resistance to form a dynamic battery characteristic. Individual cells can be arranged in series and parallel to reproduce different battery-pack voltage, capacity and resistance profiles.
Custom characteristics
Two user-defined models with up to 200 data points each can be imported and exported in CSV format.
Single and cycle tests
Charge and discharge processes can run once or repeatedly between configurable SOC limits.
LAN connectivity
Communication with compatible N35100 and N35500 devices is established through an Ethernet connection.
Personal project consultation
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Select the appropriate technical configuration or access product documentation directly.
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NS 81000
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NS81000 overview
NS81000 is PC-based battery simulation software for compatible N35100 and N35500 bidirectional DC power supplies. It reproduces the electrical behaviour of individual battery cells and complete battery packs using state of charge, open-circuit voltage, internal resistance and capacity. Seven predefined battery types accelerate the preparation of recurring tests. Two user-defined models with CSV import are available for measured characteristics and alternative cell chemistries. Series and parallel cell arrangements and cable impedance can be included in the pack configuration. During operation, the system automatically changes between charging and discharging according to the external voltage. Measurements and characteristics are displayed graphically and can be stored for subsequent evaluation when data logging is enabled. Operation and device communication are handled from a Windows PC over LAN.
Key benefits
Predefined and custom models
Seven standard models and two configurable characteristics cover recurring tests and application-specific battery profiles.
State-dependent simulation
Open-circuit voltage and internal resistance are determined from the simulated state of charge at the current operating point.
Configurable battery packs
Up to 500 cells in series and 500 parallel cells can be modelled together with cable impedance.
Measurement-based characteristics
Custom SOC, VOC and resistance data can be edited in tabular form, imported and exported for reuse.
Repeatable test cycles
Configurable upper and lower SOC limits enable repeated charge and discharge processes with a defined cycle count.
Graphical measurement display
SOC, voltage, current and further status values are shown numerically and as trends during the test.
Battery simulation principle
The simulation uses an internal resistance model. Terminal voltage is determined by open-circuit voltage, internal resistance and current flow. The software calculates the current state of charge from the measured voltage and current values. It then retrieves the corresponding open-circuit voltage and internal resistance from the selected characteristic.
Model relationship: Terminal voltage follows Vt = VOC − R0 × i. VOC represents open-circuit voltage, R0 represents internal resistance and i represents terminal current.
When the external voltage exceeds the simulated battery voltage, the system operates in the charging state. A lower external voltage or the absence of an external voltage causes it to change to the discharging state. The same model can therefore reproduce both current directions of a battery test.
Battery models and characteristics
The standard library provides characteristic SOC-dependent voltage and resistance profiles for seven battery types. After selecting a model, capacity, initial SOC, cell voltage, internal resistance and pack configuration can be adapted to the test.
| Battery model | Use within the software |
|---|---|
| LiFePO4 | Predefined characteristic for lithium iron phosphate cells. |
| Ternary lithium | Predefined characteristic for ternary lithium cells. |
| Lead-acid | Predefined characteristic for lead-acid batteries. |
| Ni-MH | Predefined characteristic for nickel-metal hydride batteries. |
| LTO | Predefined characteristic for lithium titanate cells. |
| ICO | Predefined ICO characteristic. |
| IMO | Predefined IMO characteristic. |
| Custom 1 and 2 | Two user-defined characteristics with up to 200 data points each. |
Custom battery characteristics
Up to 200 points
Each of the two user-defined characteristics can contain up to 200 combinations of SOC, VOC and internal resistance.
Separate SOC assignment
With dual SOC assignment enabled, VOC and internal resistance can reference separate SOC data series.
VOC values must correlate positively with their associated SOC. CSV files must not contain missing data or blank rows.
Characteristic data can be edited directly in the software or imported from a CSV file. Export supports the backup, transfer and later reuse of adapted models.
Battery pack configuration
| Parameter | Setting range | Function |
|---|---|---|
| Initial SOC | 0 to 100% | State of charge at the start of a standard-model simulation. |
| Cell capacity | 0.01 to 5,000 Ah | Capacity of an individual cell. |
| Cell internal resistance | 0 to 1,000 mΩ | Equivalent internal resistance of the individual cell. |
| Cell open-circuit voltage | 0.1 V up to the device rating | Open-circuit voltage of a fully charged individual cell. |
| Parallel cells | 1 to 500 | Number of individual cells connected in parallel. |
| Cells in series | 1 to 500 | Number of individual cells connected in series. |
| Cable impedance | 0 to 1,000 mΩ | Total impedance of the battery-pack connection cables. |
| Charge-current limit | 1% of rated value up to the configured rated value | Limits current during charging. |
| Discharge-current limit | 1% of rated value up to the configured rated value | Limits current during discharging. |
Connecting cells in series increases pack voltage and total internal resistance. Parallel strings increase available capacity and current capability while reducing the equivalent internal resistance.
Test modes and process control
Single test
Charge and discharge processes can be terminated by SOC, VOC, capacity or time.
Cycle test
SOC repeatedly moves between upper and lower limits until the configured number of cycles has been completed.
Pause simulation
During a pause, SOC and VOC remain constant while voltage and current continue to follow the battery model.
Five test cases
Up to five configurations can be prepared and imported or exported as snapshots.
Changed battery or test parameters are transferred to the connected device with “Refresh Configuration”. This update is unavailable while the output is active.
Measurements and historical data
The user interface displays the simulated battery status and electrical measurements in real time during charging and discharging. A trend graph plots SOC, terminal voltage and current over time.
Electrical measurements
Terminal voltage, current and power are displayed together with the current operating state.
Model parameters
Current SOC, open-circuit voltage, internal resistance and cycle count remain visible throughout the test.
Historical evaluation
When data logging is activated manually, configurations and measurement trends can be reviewed after the test.
Typical applications
Configurable battery profiles support repeatable functional and load testing of equipment that charges batteries or operates from a battery supply.
Battery charger testing
The simulated battery absorbs charging current and changes SOC, VOC and internal resistance according to the selected characteristic.
Supplying battery-powered devices
Electronic equipment can be tested using repeatable voltage and resistance profiles from a defined battery model.
Characteristic-based development
Measured cell data can be transferred to a custom model for repeatable development and comparison tests.
Charge and discharge cycling
Defined SOC limits enable cyclic testing of battery chargers and battery-powered devices.
Device connection and system requirements
| Area | Requirement or function |
|---|---|
| Compatible device series | N35100 and N35500 with battery simulation function |
| Communication | LAN over an Ethernet connection |
| Operating system | Microsoft Windows 7 or later |
| Processor | Dual-core processor, 2.0 GHz or faster |
| Memory | At least 4 GB |
| Storage | At least 80 GB |
| PC connection | Ethernet port |
| Default read delay | 0.1 s |
| Default device ID | 160 |
The PC and device must be assigned to the same IP subnet while using different IP addresses. Disable automatic computer standby for extended tests.
Monitoring and protection functions
Configurable current shutdown
If operating current exceeds the configured fuse value, the output is switched off and an alarm is displayed.
Status indication
Separate indicators show operation, errors and the active charging or discharging state.
The configurable fuse current ranges from 0 to 105% of the device-rated current. A value of 0 disables this additional limit. Error states can include configuration, self-test or memory errors as well as OVP, OCP and OTP alarms.
Frequently asked questions
Which devices does NS81000 support?
The software is intended for compatible N35100 and N35500 bidirectional DC power supplies.
Which battery types are predefined?
The library includes LiFePO4, ternary lithium, lead-acid, Ni-MH, LTO, ICO and IMO models.
Can custom battery characteristics be used?
Yes. Two custom models with up to 200 data points each can be edited, imported and exported in CSV format.
How is a battery pack configured?
Cell capacity, VOC, internal resistance, initial SOC, series and parallel quantities and cable impedance are configured separately.
Are repeated charge and discharge cycles possible?
Yes. A cycle test moves the simulated SOC between upper and lower limits until the specified cycle count is reached.
How is the device connected?
The connection uses LAN. The PC and device require different IP addresses within the same subnet.
Are measurements saved automatically?
No. Data logging must be activated manually before the test.
When does the simulation change between charging and discharging?
An external voltage above the simulated battery voltage activates charging. A lower or absent external voltage activates discharging.
Technical consultation and project enquiry
We can help select a suitable N35100 or N35500 configuration based on the required voltage, current and power ranges and the intended battery profile.
Send us details about the device under test, cell chemistry, pack configuration and intended charge or discharge process through our contact page.
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