Endurance Test
What was tested, for how long, under which load, with which instruments, and what happened.
A VENDOR.Max laboratory prototype completed a continuous 532-hour run with a constant connected load of the 4.0 kW class. Over that interval the operating regime did not collapse, no hardware failure was recorded, and the customer port was not disconnected by the output protection. The run was ended by the operators. What follows is the test record.
One uninterrupted interval under a constant connected load.
Laboratory and engineering operation across recorded sessions.
Class of the load configuration kept connected throughout the run.
The 16 A output protection did not disconnect the customer port at any point in the run.
4.0 kW describes the connected load configuration. It is not a measurement of active power at the customer port.
What was controlled
Six controls of the test programme, stated before any result. This section reports the configuration.
A historical VENDOR.Max laboratory prototype. Not a production unit and not a pre-sale configuration.
This page describes the prototype on which the tests were performed and for which this record was captured. It does not describe the present state of the system. What VENDOR.Max is and where the programme stands now is set out in VENDOR System.
1. Startup-source boundary
The prototype existed in two startup configurations.
Revision A. An external battery is connected to the startup port for initiation only and is physically disconnected once the operating regime is established. In individual demonstrations this happened after roughly 10 to 15 seconds. During subsequent operation the source is physically absent from the circuit, not merely de-energised by logic.
Revision B. Startup is performed by the internal system; the battery remains in the loop as a bidirectional regime buffer.
The revision is stated wherever the test record establishes it. The 532-hour run was performed in the Revision A configuration, with startup at 9 V for about 10 seconds.
2. Load-circuit configuration
The load was connected to the customer output as a consumer. On the load side there was no separate connection to the grid, to a battery, to a generator or to any other independent power source capable of continuously returning energy into the prototype.
A reactive or rotating load can briefly return part of the energy it has previously received. Such a return flow is not an independent energy source: it originates from energy previously delivered to that same load.
Single connection to the test load.
No grid connection. No external battery. No external generator.
If present, not an independent source.
3. Output path and customer-port limit
The historical prototype used a household AC output path. The customer output was implemented as a protected 220 V / 16 A interface. That applied to the output port and its electrical implementation, not to the internal class of the installation.
At those nominal values, the interface corresponds to an apparent-power scale of 3.52 kVA.
16 A is the nominal current of the protected interface, not a hard instantaneous trip threshold. Protection behaviour depends on the characteristics of the specific protective device and its operating conditions.
Delivering 5 kW as a nominal rating through one such household interface was not part of the design.
5 kW described the development class of the historical prototype. 220 V / 16 A described the specific household AC implementation of its customer port. These are different characteristics.
A load configuration of the 4.0 kW class was a deliberately demanding condition for this particular AC implementation. The continuous run examined two things at once: long-term retention of the operating regime, and the behaviour of the output path — the inverter and the 16 A protection.
The physical core, the specific component implementation and the customer interface are three different levels of description, and a characteristic of one is not a characteristic of another.
4. Calorimetric cross-check of the load
Electrical observations were not the only way the load response was assessed. A separate series used water calorimetry: water quantity, temperature rise and elapsed time were measured directly.
The figures are given in the results section.
5. Operating-state monitoring
Throughout the test programme the operating state was monitored instrumentally at several measurement planes.
Observations at different planes belong to different physical quantities, different charge ensembles and different temporal classes. Numerical values for internal planes are not published on this page: they belong to Where Is the Plus and to the metrology layer.
6. Internal electromagnetic screening
The test programme included internal observations of the electromagnetic environment, among them monitoring of the radiated high-frequency field with a HyperLOG 7040 measurement antenna, and point field measurements.
This is engineering screening, not a certification test for electromagnetic compatibility. Numerical readings are not published: individual point readings are not used to claim conformity with standards.
Instruments
| Equipment | Role |
|---|---|
| HyperLOG 7040 measurement antenna | Observation of the radiated high-frequency field |
| SOEKS Quantum dosimeter | Point check of the environment |
| MEGEON electromagnetic field meter | Point check of the environment |
| Scales | Mass of the complete prototype |
| Measuring vessel, thermometer, stopwatch | Calorimetry |
| Resistive heater 2.4 kW; inductive load 800 W | Real load appliances |
The test programme
Seven records. Each answers a different question.
Continuous endurance run
Revision A · 532 h · constantly connected load configuration of the 4.0 kW class. Long-term retention of the operating regime and the behaviour of the output path under that load configuration.
Cumulative engineering sessions
All configurations · 1,000+ h. Repeated starts and stops, varied and peak load levels, protective disconnections, instrumental working sessions.
Calorimetry of the load
Revision A · five repeats. Water-heating result obtained by a method that does not require high-frequency wattmetry.
Combined dynamic load
Revision B · 20 minutes. Behaviour with an inductive component and repeated inrush peaks.
Destructive testing
Early builds. Deliberate loading of the power path to failure in order to locate the limiting element.
Filmed working demonstration under load
Revision B · video record. Operation with real household AC appliances.
Off-site demonstrations
Revision A and Revision B · several locations outside the laboratory. Repeated starts and operation under load in both startup configurations.
Results
Results belong to separate test series. Results of different series are not combined on this page into a single energy balance.
Continuous 532-hour run
| Parameter | Record |
|---|---|
| Continuous interval | 532 h |
| Configuration | Revision A |
| Load configuration | Constantly connected, 4.0 kW class |
| Startup | 9 V for about 10 s, then the startup source physically disconnected |
| Collapse of the operating regime | None |
| Hardware failure | None |
| Disconnection of the customer port by the 16 A output protection | Not recorded across the interval |
| Termination | Controlled, by decision of the operators |
The load configuration remained constantly connected. There were no peak regimes within the run.
Recorded operating time
| Reading | Meaning in the test record |
|---|---|
| 532 h 23 min 11 s | Reading associated by the test record with the continuous run |
| 1,000 h 00 min 06 s | Total operating time, as labelled by the interface |
The figures 532 h and 1,000+ h used on this page are roundings of these readings.
Calorimetry
| Parameter | Value |
|---|---|
| Load | Resistive heater, nameplate 2.4 kW |
| Water quantity | 1.0 L |
| Temperature | 20 to 100 °C |
| Elapsed time | 240 s |
| Repeats | 5 |
| Water-heating energy per run | 334.9 kJ · calculated from measured inputs |
| Total across five repeats | 1.67 MJ · calculated |
| Mean water-heating power | 1.40 kW · calculated |
For the energy calculation 1.0 L of water is taken as approximately 1.0 kg.
The calculation uses the water quantity, the temperature rise, the elapsed time and the standard specific heat capacity of water. It does not use the phase of the electrical signal, RMS values, duty cycle or power factor.
The value of 1.40 kW is a water-only thermal result. Heating of the vessel, heat transfer to the surroundings and the energy of evaporation are not included in the calculation. It is therefore not an estimate of the full electrical power of the heater.
Combined load
The operating regime remained stable for 20 minutes under combined resistive and inductive loads with repeated peaks. There was no collapse of the regime.
More than 1,000 hours does not represent a single operating regime
532 hours is a continuous endurance run. 1,000+ hours is cumulative operation across recorded engineering sessions.
Those sessions include repeated starts and stops, varied and peak load levels, combined loads, protective disconnections and instrumental working observations.
The filmed working demonstration and the off-site demonstrations form a separate, broader body of evidence. They are not counted separately towards the 1,000+ hour figure on this page.
A protective trip and a system failure are different events
| Term | Meaning |
|---|---|
| Protective trip | Intended disconnection of the customer port on reaching a protective condition |
| System failure | Unintended loss of the operating state, or a hardware failure |
Output-protection trips occurred during peak tests in other sessions and were not treated as failures of the installation. In the 532-hour run the customer port was not disconnected by the output protection.
Filmed working demonstration under load
The record shows the sequence: startup, establishment of the regime, connection of household loads, operation, shutdown.
The recording shows operation with a resistive load of 2.4 kW nameplate and an inductive load of 800 W nameplate. Nameplate values of load appliances are not measured transferred energy.
Off-site demonstrations
The prototype was repeatedly started and demonstrated outside the laboratory in both configurations.
Revision A. An external battery was connected to the startup port for the start. Once the regime was established — after roughly 10 to 15 seconds — the battery was physically disconnected from the startup port. The installation then ran in demonstration mode with a load connected.
Revision B. Startup was performed by the internal system. During off-site demonstrations the installation was repeatedly switched off and restarted from the main switch, after which the same observable sequence followed: startup, establishment of the regime, connection of load, operation, shutdown.
Across different locations the observable startup and operating sequence was reproduced repeatedly.
Why there is no watts-in to watts-out table here
Frame 0 is the external boundary of the complete device. Frame 1 is the internal boundary of the working core. The internal input of Frame 1 and the external input of Frame 0 are different physical quantities and cannot be represented as the same boundary input power.
In the Revision A configuration the external startup source exists only during initiation. After it is physically disconnected, the internal Frame 1 flow cannot be renamed as the external Frame 0 input.
Internal voltages and currents belong to different temporal classes and different charge ensembles. Multiplying them arithmetically, or comparing them in sequence, does not form an end-to-end energy balance. Without a correct distinction between planes, temporal classes and the external boundary, identical voltage and current values admit physically different interpretations.
The site therefore keeps two languages apart: the charge model is used for the local mechanism and the organisation of motion, while the energy balance is used for quantitative accounting at an explicitly chosen boundary.
This page publishes the conditions and results actually observed. Working planes and local changes are covered by Where Is the Plus. The rules of quantitative energy accounting are covered by Energy Model. The complete external-boundary balance belongs to Technology Validation.
How the 532-hour run proceeded
The causal sequence of the run, from a de-energised state to a controlled shutdown.
- T0
- Installation de-energised.
- T1
- External startup source connected: 9 V for about 10 s.
- T2
- Operating regime established.
- T3
- External startup source physically disconnected.
- T4
- Regime maintained.
- T5
- Load configuration of the 4.0 kW class connected.
- T6
- Operation with that load configuration — 532 hours.
- T7
- Load removed, run ended by the operators.
The run was ended by the operators after 532 hours. It was stopped because it required continuous human supervision of an operating experimental prototype, not because of a failure of the installation or a protective trip.
Peak regimes and protective trips are not part of this run and belong to other sessions of the programme.
Physical evidence
What can be seen directly.
The tested AC implementation and the failures that occurred
Which part of the configuration the run actually stressed, and which limiting elements were identified in earlier work.
The 532-hour run related to one specific historical AC implementation of the output path: an inverter and a protected 220 V / 16 A customer port. Over that interval the inverter did not fail and the protection did not disconnect the port.
The result relates only to the tested historical AC implementation and does not automatically transfer to other output configurations. How the functional route is arranged, and which output configurations exist, is set out in How It Works.
During development, early builds were deliberately driven to destruction. Three limiting failures were recorded in sequence: a wound assembly, a ferrite magnetic core and output-stage power transistors.
After each failure was addressed, the next element of the power path became the limiting one. These results were used in the subsequent revision of the prototype.
What is established and what is not
The record supports statements about system operability. It does not substitute for independent verification.
Established
- the prototype was built and operated, and the record of that operation was captured;
- the operating regime was retained over a long interval with a constantly connected load configuration, and was not a short-lived effect;
- over the 532-hour run no hardware failure of the AC output path was recorded, and the customer port was not disconnected by the protection;
- the operating regime was reproduced in repeated sessions;
- outside the laboratory, repeated start and operating cycles were demonstrated in both revisions of the prototype: in Revision A the external startup battery was physically disconnected once the regime was established, and Revision B was restarted from the main switch using the internal startup system;
- in peak tests of other sessions, trips of the output protection were observed; in the continuous 532-hour run with a constantly connected load configuration the protection did not disconnect the port;
- three limiting failures were established in real destructive tests;
- in the calorimetric series the input quantities were measured and the water-heating thermal result was calculated; the method does not require high-frequency wattmetry.
Not established
- the energy balance at the complete device boundary;
- end-to-end efficiency of the complete device;
- compliance with safety and electromagnetic-compatibility requirements;
- formal environmental qualification across defined ranges of temperature, humidity, vibration, dust, ingress protection and electromagnetic environment;
- characteristics of a production unit.
This is an internal laboratory record, not independent certification. Independent verification is the next evidence layer: Technology Validation.
