Performance Analysis

A battery is sold on a datasheet and lived with on a duty cycle. The gap between the two is where capacity guarantees are lost, warranties become unenforceable and a revenue model quietly stops matching the asset. This work measures that gap on your own plant, with your own telemetry.

Degradation, and why a linear assumption is wrong

Lithium-ion degradation is not a straight line. It depends on the duty cycle, on thermal stress and on what the asset is actually dispatched for — fast frequency response and energy arbitrage age a cell differently.

• State-of-health tracking rather than a fixed percentage: a model that follows the cells as they are used, in place of a linear assumption carried over from the tender.
• Capacity fade diagnostics: separating loss of active material from lithium inventory depletion, because the two have different causes and different remedies.
• Thermal gradients under high C-rate: cell-to-cell temperature spread tracked during aggressive cycling, which is where accelerated ageing starts.

Round-trip efficiency measured across the whole chain

A bankable efficiency figure is AC to AC, not DC to DC. Everything the site consumes to keep the battery alive belongs in that number, and it is usually the part left out.

• Parasitic loads: thermal management, auxiliary supply and cooling pumps accounted for explicitly rather than folded into a margin.
• The conversion chain: losses calculated separately across modules, DC/DC stages and the inverter transformer, so it is clear which stage is costing what.
• A figure that survives diligence: net AC-to-AC efficiency documented so that a lender’s engineer can reproduce it from the same data.

State of charge you can rely on

Battery management systems drift. A drifting SoC estimate either limits capacity that is actually there or promises capacity that is not, and the second version is the one that turns into a non-compliance event during a dispatch instruction.

• State estimation under dynamic profiles: filtering that holds accuracy through high-frequency charge and discharge, not only in steady conditions.
• Open-circuit-voltage recalibration: rest periods used to clear the cumulative error that coulomb counting builds up over weeks.
• Usable headroom, stated honestly: how much energy is genuinely available right now, which is the number that matters when the operator calls.

Health models, warranties and compliance

• Early fault isolation: internal micro-shorts, impedance anomalies and degrading connections identified before they become a safety event.
• European standards: performance assessed against the IEC 62933 series, with safety considerations mapped to IEC 62933-5-1 and to national hazardous-area rules.
• Warranty enforcement: independent traces of throughput and capacity against what the supplier guaranteed. A claim is only as good as the data behind it, and that data has to be collected before it is needed.

What you get

A written analysis with the measurement method stated, the raw telemetry referenced, and every conclusion traceable to it. Where the data does not support a conclusion, it says so rather than filling the gap with a manufacturer figure.

Related work

If the question is whether a design will perform rather than whether it does, see Pre-Submission Technical Review. For a plant not yet built, Project Development Support covers the engineering from application to construction, and Grid Connection Strategy the connection it depends on.