Introduction
Grid-tied energy storage systems combine peak shaving, time-of-use (TOU) optimization, and backup power. Selecting LiFePO₄ battery capacity for such hybrid applications requires careful evaluation of grid tariffs, load profiles, and outage risks.
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1. Peak Shifting Capacity Calculation
Battery capacity should cover energy consumption during high-tariff periods.
Capacity = Peak Load (kW) × Peak Duration (h)
Example:
Peak load = 50kW
Peak duration = 3h
Required capacity = 150kWh
2. Backup Function Integration
If backup is also required, capacity must include critical load autonomy.
Total Capacity = Peak Shifting Capacity + Backup Capacity
3. Time-of-Use Optimization
Battery systems charge during low-tariff hours and discharge during peak tariff hours. Capacity should be sufficient for daily tariff cycles to maximize savings.
4. Grid Reliability Consideration
Regions with unstable grids require additional reserve capacity to handle unexpected outages.
Conclusion
For grid-tied ESS, LiFePO₄ capacity selection should simultaneously consider peak shaving demand, TOU optimization, and backup reliability to achieve maximum economic and operational efficiency.