Technical Design Review

A design review exists to find the things that stop a project later: the clause a network operator will not accept, the safety case an insurer will not underwrite, the detail a permitting authority will send back. We read the package as those three readers will, and we do it while changes are still cheap.

Inverter and PCS integration

The power conversion system is where the battery meets the grid, and it is where most compliance findings originate.

• Network code conformity: reactive power capability, fault ride-through and frequency response checked against EN 50549-1 and EN 50549-2, the Romanian connection regulation and the Polish grid codes — whichever will actually be applied to your point of connection.
• Power quality: harmonic distortion modelled at the connection point, both to satisfy the operator and to avoid the transformer ageing that nobody budgets for.
• Multi-inverter coordination: control interaction between units checked for hunting and power swings, the failure mode that only appears once the plant is running at scale.

Fire detection and suppression

• Early detection: off-gas sampling for hydrogen and carbon monoxide, which reacts long before a temperature threshold does.
• Deflagration management: venting paths and blast panel configuration reviewed against the explosive atmosphere rules that apply on site.
• Suppression and brigade interface: clean-agent systems checked together with the external water connections the local fire service will expect to use, because the two are usually specified by different parties and rarely checked together.

Thermal runaway containment

One cell failing must not take a container with it. That is a design property, not a hope.

• Propagation barriers: cell geometry, thermal barriers and module-level margins assessed against the propagation behaviour the test data actually shows.
• Cooling uniformity: liquid loop performance checked so the temperature spread across racks stays within roughly two degrees under continuous dispatch. Beyond that, cells age at different rates and the pack diverges.
• Test evidence that matches the build: equipment test logs traced against UL 9540A criteria and against the large-scale fire testing expectations added in the 2026 edition of NFPA 855.

Earthing and surge protection

• Earthing grid design: fault current paths checked against EN 50522 for installations above 1 kV AC.
• Step and touch potentials: substation and container perimeter verified under worst-case ground fault, which is the calculation that protects people rather than equipment.
• Surge and lightning: protection devices and bonding reviewed to keep SCADA and BMS data lines intact, since those failures present as data problems long before anyone suspects the earthing.

What you get

A written review listing every finding, separated into what blocks approval, what raises cost, and what is a matter of preference. Each finding cites the drawing or calculation it came from, so the design team can act on it without a second meeting.

Related work

If the documents are heading to a lender or a grant panel rather than to a designer, Pre-Submission Technical Review is the closer fit. For the connection the design depends on, see Grid Connection Strategy; for the engineering that carries a project to construction, Project Development Support.