Technology Selection

Hardware selection is where a twenty-year cost is decided in a few weeks, usually from datasheets written to win the tender. This work replaces the vendor claim with something you can audit: what the chemistry does under your duty cycle, what the cooling actually costs to run, and whether the factory behind the quote can deliver it consistently.

Chemistry, chosen against the duty cycle

LFP has become the utility-scale default for good reasons — thermal stability and cycle life — but the default is not automatically right for every application.

• LFP under your cycling profile: degradation behaviour checked against the way the asset will actually be dispatched, which for frequency containment looks nothing like an arbitrage profile.
• Sodium-ion, assessed rather than dismissed: viability for long-duration storage, lower raw-material supply risk and behaviour at low temperature, which matters more in Central Europe than the datasheets suggest.
• Chemistry against the permitting file: how the chosen cell maps onto fire barrier requirements and the safety directives the local authority will apply. A chemistry that complicates permitting has a cost that never appears in the price per kWh.

Cooling: what it delivers and what it consumes

Temperature uniformity across cells is the single strongest lever on capacity fade. It is also the largest recurring parasitic load on the site.

• Liquid cooling: closed-loop architecture assessed for whether it holds the spread across modules to roughly two degrees, which is what keeps internal resistance matched and round-trip efficiency where it was promised.
• Air cooling: auxiliary load quantified over the year rather than at nameplate, so the operating cost difference is visible before the decision, not after.
• Refrigerant and containment: loop containment checked against the European F-gas rules, which decide what can be used and what has to be reported for the life of the plant.

The supplier behind the quote

Financing depends on supply-chain transparency as much as on the specification. A factory audit answers a question a datasheet cannot: whether cell number four hundred thousand is the same as the sample.

• Production line quality control: cell consistency, welding quality, particle control and end-of-line formation logs, checked at the plant rather than taken from a certificate.
• Battery passport and traceability: compliance with Regulation (EU) 2023/1542 — raw material origin, carbon footprint and end-of-life route. The digital passport requirement lands during the life of anything specified today, so it belongs in the selection, not in a later retrofit.
• Independent verification of guarantees: factory test data compared against field behaviour under real European load profiles, which is the only way to know whether a capacity guarantee is enforceable.

What you get

A written comparison with the criteria stated up front, the evidence for each option attributed, and a recommendation that says what it depends on. Where two options are genuinely close, it says that too, instead of manufacturing a winner.

Related work

Once the technology is chosen, Technical Design Review checks the package built around it, and Performance Analysis measures whether the plant delivers what was specified. For the connection the whole thing depends on, see Grid Connection Strategy.