What sits behind an offer

On paper, two offers can look identical: same output, same ingress protection, similar price. The difference shows up later — with the first unit that comes back from a rental fleet.

So when you buy a unit you are not only buying a specification, you are also buying the answer to a second question: who tested it, and with what? That question cannot be answered from a datasheet. It can only be answered where the unit was tested.

The P25 and P36 series are built in our own plant. What that means in detail is the rest of this article — with the values from our test bench.

Three stations, in this order

Every unit passes three stations before it is packed:

  • Assembly stations — the unit is built up.
  • IQC bench — each individual unit, not a sample.
  • Aging racks — a continuous run on the finished product.

Only after all three does a unit leave the plant.

Why the order matters

A sample tells you something about a batch. Testing every unit tells you something about the exact unit you receive. The difference only becomes visible when a unit fails — and then it is the whole difference.

Ten checkpoints, with the values from our sheet

  • Serial and firmware documentation — unit serial number and firmware version recorded in the report.
  • Base function test — standard load 1–1.5 kW, DC and USB outputs tested (USB-A 22.5 W, USB-C 60 W).
  • 60-second overload test — 2.7–3.0 kW load, controlled shutdown at 60 s ± 5 s.
  • Instant overload test — load above 5 kW, shutdown within 10 s.
  • Over-temperature test — 2.3–2.5 kW load up to 80 °C, shutdown at 80 °C ± 5 °C.
  • Continuous operation test — 2 kW for 2 hours, 230 V ± 10 V, 50 Hz ± 5 Hz, temperature below 60 °C.
  • Charging test — solar and mains charging checked, time to 100 % recorded.
  • Vibration test — function checked before and after vibration, no loose parts.
  • Stability under load removal — voltage and frequency measured continuously while the load drops from 2.5 kW.
  • Documentation — results, remarks and photos filed in the test report.

The last point is the one that counts later. A value that was never written down does not exist.

What a plant record is not

Three limitations belong here — otherwise the rest of this article would be a brochure:

  • A test record is not a type approval. It describes the condition of a unit at the moment of testing, not its behaviour over years.
  • The values apply to our test setup. Different temperatures, different load profiles and different duty cycles on site can produce different results.
  • Ingress protection is not a certificate. IP54 describes how the enclosure is built. There is no test certificate for it, and we do not claim one.

What only the plant can answer

Some questions a dealer cannot answer, and neither can an intermediary:

  • Which configuration is feasible, and which one requires tooling?
  • Which voltage and which quantity are achievable in a given configuration?
  • Which test actually runs on the unit, and with what result?

The place that manufactures answers these questions. If you are planning an OEM or ODM project, tell us the configuration, voltage and quantity — then we will tell you what is feasible, what requires tooling and what lead time applies.

What you actually hold

  • The factory test report for the unit — on request.
  • CE conformity under EMC Directive 2014/30/EU — test report on request.
  • The patent certificates for the P25 and P36 series — on request.

Manufacturing: Guangdong, China — the same region named as the manufacturer address on the CE report.

*Test values from our factory inspection sheet (extract). Conditions on site may differ and can produce different results.*