How can boat operators calculate the total cost of ownership (TCO) when switching to lightweight lithium batteries?

To calculate TCO for marine lithium batteries:

  1. Log Loads and Duty Cycles: Measure currents/durations for trolling motors, hotel loads, and charging windows using shunts or battery monitors.
  2. Model Usable Energy Needs: Convert logged data into kWh requirements. For example, a 12V 200Ah LFP pack provides ~2.2 kWh at 90% DoD.
  3. Compare Lifecycle Costs: Factor in upfront costs ($900/kWh for LFP vs. $250/kWh for AGM), cycle life (3,200 kWh delivered for LFP vs. 200 kWh for AGM per installed kWh), and fuel savings (3–10% from weight reduction).
  4. Include Ancillary Costs: Account for alternator upgrades, installation labor, and downtime savings. For fleets, reduced mid-season failures (e.g., no AGM swaps) lower operational costs.
  5. Example Scenario: A charter fleet replacing two AGMs annually ($400 each + labor) might spend $1,200–$1,600/year. A $2,500 LFP bank lasting 5–7 years cuts costs and eliminates refunds from failures.

Stress-test models with conservative assumptions and validate via pilot installations.

This answer is sourced from Posts《Lightweight lithium battery for boat》

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