Estimate the grid battery storage duration using transparent inputs tailored to grid battery planning. The calculator returns a main estimate plus supporting values so you can check assumptions, compare scenarios, and identify the variables that most affect the result. Use measured project data when available; early-stage defaults are only a starting point and should be replaced before making an investment or engineering decision.
The calculation assumes constant power and does not include recharge time.
The result is the constant-load support time after reserve and derating adjustments.
Planning estimate only. Confirm equipment limits, degradation, auxiliary consumption, site conditions, tariffs, financing, tax treatment, and safety requirements with qualified professionals.
For 400 MWh, 100 MW, a 10% reserve, and 5% derating, available energy is 342 MWh and duration is 3.42 hours (205 minutes).
Only losses represented by the efficiency or derating input are included. Add upstream losses to the relevant input assumption when needed.
Use annual output or operating assumptions that already reflect partial cycling and actual dispatch.
Use a current usable-capacity value for a single-year estimate, or include a degradation assumption when the calculator provides one.
No. It is a planning estimate and does not model every control limit, tariff, tax, financing, safety, or site-specific constraint.
Dispatch strategy, ambient conditions, auxiliary loads, downtime, control limits, prices, and measurement boundaries can all change actual performance.
| Variable | Unit | Meaning |
|---|---|---|
| Capacity | MWh | Usable stored energy |
| Load | MW | Constant discharge demand |
| Reserve | % | Energy held back |
| Derating | % | Operating reduction |