How depth of discharge affects LiFePO4 battery lifespan and total energy throughput
Estimated Cycle Life =—cycles
Battery Lifespan ≈—years
Total Energy Throughput ≈—MWh
Cost per kWh Cycled ≈—$/kWh (at $300/kWh)
Key insight: 80% DoD is the sweet spot for LFP — excellent cycle life with ~80% usable capacity
Total throughput: Cycles × kWh × DoD — compare to see which DoD gives more total energy
About This Calculator
What this tool does: Shows how depth of discharge impacts battery cycle life and long-term replacement economics.
Core idea: Deeper cycles increase stress per cycle, typically reducing total cycle count.
Mini Example
Cycling at 80% DoD may deliver fewer cycles than 50% DoD, but strategy depends on total throughput and economics.
Quick Literacy Notes
- Shallower cycling often increases lifetime throughput despite lower daily usable energy.
- Calendar aging continues even with light cycling, especially at high SOC and temperature.
- Choose DoD strategy based on total cost of ownership, not cycle count alone.
Common Mistakes
- Optimizing only cycle count instead of cost per delivered kWh.
- Ignoring calendar aging at high SOC and high temperature.
Key Takeaways
- Deeper cycles increase stress per cycle, typically reducing total cycle count.
- Shallower cycling often increases lifetime throughput despite lower daily usable energy.
- Avoid this mistake: Optimizing only cycle count instead of cost per delivered kWh.
Practical Checklist
- Model lifetime throughput, not cycle count alone, for economics.
- Avoid prolonged high-SOC and high-temperature storage when possible.
- Tune DoD policy to warranty terms and replacement-cost assumptions.
FAQ
Q1: Which lifecycle metric matters more than raw cycle count?
Quick Answer: Validate this first: Shallower cycling often increases lifetime throughput despite lower daily usable energy.
Engineer Note: If this assumption drifts from real conditions, downstream outputs can remain numerically neat but operationally wrong. Confirm with measured or site-specific inputs before locking decisions.
Q2: What DoD strategy mistake usually increases total ownership cost?
Quick Answer: Avoid this first: Optimizing only cycle count instead of cost per delivered kWh.
Engineer Note: In practice, the next failure mode usually follows: Ignoring calendar aging at high SOC and high temperature. Address both together; correcting one while keeping the other often leaves the design bias unchanged.
Q3: When should I build a throughput-and-replacement economic model?
Quick Answer: Use this calculator for fast screening and scenario comparison.
Engineer Note: For procurement, warranty, compliance, or commissioning decisions, move to detailed verification with datasheets, measured conditions, and project constraints. Core rule: Deeper cycles increase stress per cycle, typically reducing total cycle count.
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