BESS metrics & concepts

The battery-storage metrics that actually decide warranty standing and revenue, defined plainly, with the formulas, typical ranges, and how NuraVolt tracks each one.

State of Health (SoH)

The headline number for how much battery you have left.

Round-trip efficiency (RTE)

How much energy survives a charge-and-discharge cycle.

Depth of discharge (DoD)

How deep each cycle goes — and what it costs in lifetime.

Equivalent full cycles (EFC)

A single number that normalises messy partial cycling into full-cycle equivalents.

Rainflow counting

The fatigue-analysis method borrowed to count battery cycles correctly.

C-rate

How fast you charge or discharge, relative to capacity.

State of Charge (SoC) and the SoC window

How full the battery is — and why dwelling near full ages it.

Warranty as a data product

Turning operating data into a defensible — or contestable — warranty position.

Battery augmentation

Adding capacity mid-life to hold a contracted output as cells fade.

Capacity maintenance & the warranty fade threshold

Keeping usable capacity above the contracted curve over the asset’s life.

BESS availability

The share of committed time the storage asset could actually respond.

Levelised Cost of Storage (LCOS)

The all-in cost per MWh cycled through the battery over its life.