Gone with the Wynns · video

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During a 300-nautical-mile passage in the Philippines, a catamaran experiences a severe thermal runaway event involving its 12-volt AGM start batteries.Watch The crew initially mistakes the chemical odor for exhaust fumes while motoring, but discovers the port and starboard start batteries are severely swollen and overheating.18:04 The failure stems from an overcharging event, likely caused by a disconnected buffer battery breaker that was left off during previous electrical work in Cebu.18:31 While managing the battery crisis, the crew also contends with heavy debris, including large logs, and navigates through squalls requiring three reefs in the main sail.10:35 The vessel’s hybrid propulsion system, which includes 48-volt lithium-ion house banks and 12-volt start batteries, complicates the troubleshooting process.17:45 The crew maintains minimal speed under sail while consulting with the manufacturer to safely isolate the damaged components and ventilate the toxic fumes from the interior.19:04 Recognizing the distinct, hairspray-like smell of off-gassing batteries is critical for identifying thermal runaway before it escalates.20:11

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