Introduction
Depth of Discharge (DoD) directly affects usable capacity and battery lifespan. Proper DoD design is essential when selecting LiFePO₄ battery capacity for long-term energy storage projects.
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1. Relationship Between DoD and Cycle Life
| DoD | Expected Cycles |
|---|---|
| 100% | 3000–4000 cycles |
| 80% | 6000–7000 cycles |
| 60% | 9000+ cycles |
Lower DoD dramatically increases lifecycle value.
2. Usable vs Rated Capacity
Usable Capacity = Rated Capacity × DoD
Example:
50kWh battery with 80% DoD → usable 40kWh
3. Oversizing for Longevity
Designing with lower DoD requires higher nominal capacity but extends service life and reduces replacement costs.
Conclusion
Considering DoD during capacity selection is crucial for balancing usable energy, lifespan, and lifecycle cost of LiFePO₄ batteries.