On the Wind Sailing

John Harries // Lithium Batteries, Small Boats & More

Aug 23, 2022
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ANECDOTE

Early Roller-Furler Near-Disaster

  • John sailed his first ocean passage on an early Hood roller furler and called it a nightmare that nearly caused a disaster.
  • He now uses roller furlers for jibs for 38 years but warns they must be treated carefully.
INSIGHT

Lithium Fragility Requires Reliable BMS

  • Lithium cells are fragile: a single deep discharge or overcharge can permanently damage them.
  • The BMS is the safety layer, so its design and reliability determine practical battery robustness.
ADVICE

Choose Batteries Based On Usage

  • Decide your boat's usage profile before choosing lithium; match battery tech to real needs, not gadgets.
  • If you won't use heavy loads or already have ample renewables, lithium may offer little real benefit.
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