Public concept tool

BESS concept sizing with visible assumptions

Turn a power and usable-energy requirement into a preliminary duration, installed-energy basis, container count and throughput estimate.

Concept inputs

AC discharge powerMWRequired AC delivered energy at end of lifeMWhAC usable energy per container at beginning of lifeMWhDesign reserve%End-of-life retention%Round-trip efficiency%Annual full cyclescycles/year

Screening result

Discharge duration

4.00 h

Required beginning-of-life AC usable energy

275.0 MWh

Indicative containers

Annual delivered energy

60000 MWh

Annual charging energy

68182 MWh

Indicative equipment area

6,600 m²

Energy is measured at the same AC connection point. Duration = required delivered energy ÷ discharge power. Beginning-of-life usable energy = required end-of-life delivered energy × (1 + reserve) ÷ retention; containers are rounded up. Annual delivered energy = required delivered energy × full cycles; charging energy = delivered energy ÷ round-trip efficiency. This is a constant-duty annual estimate, not a degradation forecast. Use AC usable container ratings on this same basis, not DC nameplate ratings.

Concept-level only. The area basis assumes 120 m² per container including preliminary spacing and access. Confirm degradation, augmentation, fire strategy, auxiliary loads, grid-code duty and vendor configuration before design or investment decisions.