Short answer

Compare the documented application scope of specific models. Ask what was tested, under which conditions and with what limitations. Then compare capacity and operating arrangements.

1. Describe the application

Include the site and equipment types, available battery information and the intended role of the equipment in your enquiry. A workshop, charging area and large energy storage system have different contexts. Do not assume that a product in one video has demonstrated suitability for all of them.

2. Request model-specific documents

  • A technical data sheet identifying the model and version.
  • Instructions understood by the intended user.
  • The test report supporting the supplier’s claim.
  • Conformity documents with their actual scope explained.
  • Inspection, after-use servicing and support arrangements.

This is an Envoy EX purchasing checklist. It does not replace an assessment of requirements applicable to the particular site.

3. Separate the evidence

A video shows part of an event. A report allows examination of the method and result. A conformity document concerns a defined product and requirements. These are not interchangeable. UL 9540A illustrates why scope matters: UL describes it as a method for testing thermal runaway propagation in BESS. Mentioning that method does not demonstrate the effectiveness of an arbitrary extinguisher.

4. Ask about operation as well as purchase

Who provides instruction? How is readiness checked? What happens after discharge? What storage conditions does the manufacturer specify? Include these as separate items in your comparison rather than waiting until delivery to ask.

How should you compare Envoy EX 2, 6, 9, 25 and 50 L?

These are the five capacities presented in our catalogue. We do not provide a “litres per battery kWh” conversion without verified evidence. Comparison requires the particular version and a defined scenario. Request documentation and a technical discussion through the Polish partner channel.

Does greater capacity automatically mean a suitable choice?

No. Selection should account for the intended use, documentation, operation and site protection plan. Capacity alone does not answer those questions.