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Is this the FUTURE of ELECTRIC PROPULSION ? | Ask The Expert with NIGEL CALDER
7 February 2026 · 5 min · 3K views
Man pilots rigid inflatable boat across calm water with mountains.
What this video covers
Jan Attenstedt and Nigel Calder discuss the transition towards higher-voltage electric propulsion systems in marine applications, drawing parallels to the automotive industry. While electric vehicles typically utilise 400-volt DC architectures to reduce conductor size and ohmic heating, marine systems are adopting varying voltages based on specific power demands.▶ 0:24 For high-power propulsion units exceeding 50 kilowatts, manufacturers like Torqeedo are repurposing automotive battery packs, sometimes reaching 700 volts to accommodate large motors on vessels such as 100-foot boats without requiring excessively thick cabling.▶ 1:08 Conversely, 48-volt systems are increasingly series-connected to achieve higher power outputs while remaining below the 60-volt safety threshold.▶ 2:22 The ABYC E-11 standard now requires specific labelling for conductors in 48-volt systems that exceed 50 volts during charging.▶ 2:54 Unlike automotive environments, which feature integrated safety interlocks and emergency disconnects for first responders, marine high-voltage systems currently lack standardised safety protocols, necessitating professional installation and maintenance to prevent accidental contact or short circuits.▶ 4:53
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