BESS Sizing Guide

500kW / 1MWh BESS Sizing Example

Quick answer: A 500kW / 1MWh BESS is a 2-hour nominal configuration: 500kW is the power rating and 1,000kWh is the stored energy rating. Whether it can support a 500kW project load for a full two hours depends on usable SOC window, conversion losses, auxiliaries, degradation allowance and the actual load profile.

What does 500kW / 1MWh mean?

500kW describes the system’s power capability. 1MWh describes nominal stored energy. Dividing energy by power gives a nominal two-hour duration: 1,000kWh ÷ 500kW = 2 hours.

Is 1MWh enough for a 500kW load for two hours?

The raw load energy is 500kW × 2h = 1,000kWh. A real project normally needs additional allowance because not all nameplate energy is deliverable to the load. Final sizing should consider usable SOC window, conversion efficiency, auxiliary consumption, temperature, degradation target, redundancy and operating strategy.

What should an EPC provide before final sizing?

Provide the interval load profile, peak and critical load, required duration, voltage, PV capacity, generator ratings, grid outage pattern, ambient conditions, project stage and expansion plan.

Which Zevonexa solution should I review?

For projects around this scale, review the 1MWh BESS, C&I BESS and Microgrid options. Use the BESS Sizing Calculator for a first-pass estimate.

Get a preliminary project estimate

Use Zevonexa’s free calculator, then send your actual project inputs for engineering review.

Open BESS Sizing Calculator → Request a BESS Solution →

Important sizing limitation

These examples are screening guidance, not a final electrical design or performance guarantee. Final equipment selection requires project-specific engineering, applicable standards, equipment ratings and verified site data.