Battery Augmentation Schedule Calculator

Estimate when and how much additional storage capacity you must install to respect a contracted deliverable energy floor over a multi-year planning horizon.

Nameplate usable energy at commercial operation, measured in megawatt-hours.
Average percentage loss of usable energy per year once warranties begin.
Number of operational years to keep the project at or above the target threshold.
Capacity covenant or contract floor expressed as a percentage of original usable energy.

Scenario planning aid for battery asset managers; validate against vendor degradation data and contractual performance tests before finalising augmentation procurement.

Examples

  • Initial capacity 100 MWh, 3% annual fade, 12-year horizon, 90% floor ⇒ three augmentations of 11.47 MWh in years 4, 8, and 12 totalling 34.41 MWh.
  • Initial capacity 80 MWh, 2.5% fade, 15-year horizon, 85% floor ⇒ two augmentations of 12.99 MWh in years 7 and 14 totalling 25.99 MWh.

FAQ

Does the calculator account for augmentation lead times?

Lead times are not modelled explicitly. Offset the planning year by your procurement cycle so installation occurs before the deliverable threshold is breached.

Can I model different degradation rates before and after augmentation?

The expression assumes a consistent annual fade. Run separate scenarios with adjusted percentages if newer modules degrade more slowly than the original fleet.

How do I include augmentation costs?

Multiply each augmentation event’s megawatt-hours by your turnkey cost per MWh to build a capital forecast, then feed the totals into levelized cost or reserve models.

Additional Information

  • Result unit: megawatt-hours of additional usable energy installed across the planning horizon.
  • Augmentation events restore capacity to the original usable energy whenever the projection breaches the target floor.
  • The schedule assumes a single annual degradation rate applied to the entire post-augmentation fleet.

Related calculators