BESS Engineering

BESS Cycle Stress & Calendar Aging

Model battery capacity fade from daily cycling and calendar aging — Wöhler cycle model + Arrhenius temperature correction. LFP · NMC · NCA chemistry.

Presets

Battery Parameters

Cell Chemistry

Nominal Capacity

kWh

Rated energy capacity at new condition (100% SOH)

Daily Cycles

cycles/day

Average number of full charge/discharge cycles per day

Average Depth of Discharge

80 %

DoD correction: N_eq = cycles × (80%/DoD)^1.5

Average Operating Temperature

25 °C

Arrhenius temperature correction applied to calendar aging rate

C-Rate

0.5C = 2-hour discharge; 1C = 1-hour discharge

Project Life

years

Typical BESS project life: 10–25 years

End-of-Life Threshold

80 %

SOH threshold defining end of useful life (industry standard: 80%)

Initial Round-Trip Efficiency

(0–1)

Typical LFP: 92–94%, NMC: 90–92%

Cycle Revenue (optional)

$ $/MWh

Revenue per MWh per cycle — enables LCOE degradation analysis

Select a preset or enter parameters, then click calculate to model BESS aging and EOL.