Nigel Calder & Jeff Cote Talk Marine Electrical - Part 9 of 11 - Lithium Batteries
July 9, 2023 · 19 min · 5K views
What this video covers
Lithium iron phosphate (LiFePO4) batteries offer significant advantages in charge acceptance rates over lead-acid or AGM chemistries, but they require careful system integration to avoid safety risks and operational failures. Contrary to common belief, LiFePO4 batteries are not intrinsically fireproof; their safety depends on high-quality construction, adherence to standards like UL 1973, and a robust battery management system (BMS).1:07 A critical requirement for marine installations is external communication between the BMS and charging sources, such as alternators or chargers, to prevent overvoltage conditions.3:57
Unlike lead-acid batteries, which tolerate temperature extremes and high current spikes, lithium systems often disconnect abruptly if ambient temperatures fall outside specific charging ranges or if current draw exceeds BMS thresholds, such as during bow thruster operation.9:26 This sudden loss of power can disable essential navigation equipment and windlasses.7:20 To mitigate these risks, boaters should define critical circuits with redundant power sources and ensure charging systems are sized to match the battery's high charge acceptance.7:57
More from Pacific Yacht Systems
From Pacific Yacht Systems — see the channel’s boat, crew, and every analyzed video.
The Sailing Directory Newsletter
One email with the fleet's best finds — the moments, boats, and stories worth your watch time. Enter your own address to get your own copy.