{"generated_at":"2026-11-12T18:35:22.056Z","source":{"name":"Hacker News public API","url":"https://github.com/HackerNews/API","attribution":"Stories and comments are public Hacker News submissions by their respective authors. HackerHub is an independent reader, not affiliated with Y Combinator.","content_is_untrusted":true},"story_id":50467305,"hn_url":"https://news.ycombinator.com/item?id=50467305","total_comments":39,"returned":6,"scope":"Up to the requested number of top-level comments in Hacker News ranked order. Deleted comments are omitted. Nested replies are not fetched; this is not the complete thread.","comments":[{"id":50471869,"author":"calmbonsai","created_at":"2026-11-12T18:27:57.000Z","text":"Batteries will not have the requisite energy density for anything remotely long-journey--notably Panamax+ container ships which, sadly, are also the biggest carbon & sulfur (yes low-sulfer regs/fuel exists, but not everywhere) polluters.\nThese large ships will likely be de-carbonized either with ammonia turbines or fuel cells. Mann has already been running a PoC ammonia turbine ship for about 4 years--the last 2 undergoing proper blue-water \"sea-trials\" journeys.","parent_id":50467305,"replies_count":0,"hn_url":"https://news.ycombinator.com/item?id=50471869"},{"id":50469446,"author":"bob1029","created_at":"2026-11-12T15:54:24.000Z","text":"Batteries for ships seems really silly but at the same time its the perfect regime for a ridiculous quantity potentially hazardous items. Nuclear obviously works well here too. You have an unlimited amount of water with which to fight any fires or cool off equipment and you could theoretically engineer a way to dump the entire assembly into the ocean in an emergency.\nHydrodynamics are brutal, but the square-cube law works in your favor. The ocean doesn't care about what's inside your ship. Just the surface of it. The mass is mostly irrelevant. This is why cargo vessels are so large. The bigger the boat the bigger the energy density benefit.\nThe only real problem is the cost. To compete with a supermax you would need something like two billion dollars worth of batteries to survive a transpacific voyage.","parent_id":50467305,"replies_count":5,"hn_url":"https://news.ycombinator.com/item?id=50469446"},{"id":50468935,"author":"dmtroyer","created_at":"2026-11-12T15:25:38.000Z","text":"I assumed they would use sea water for cooling but that doesn't seem to be the case? Maybe the battery coolant is cooled using some sort of sea water heat exchanger?","parent_id":50467305,"replies_count":3,"hn_url":"https://news.ycombinator.com/item?id=50468935"},{"id":50471524,"author":"dyauspitr","created_at":"2026-11-12T18:08:14.000Z","text":"There’s got to be some setup out there were we are able to harness wind energy (and solar to a smaller extent) to significantly increase the ranges here. Not a hundred years ago, we had cargo ships sail solely on wind power so enough energy is there for the taking.","parent_id":50467305,"replies_count":0,"hn_url":"https://news.ycombinator.com/item?id=50471524"},{"id":50469485,"author":"bluGill","created_at":"2026-11-12T15:56:57.000Z","text":"Question is can they get enough power to be useful. Marine diesel engines are very fuel efficient, fuel oil is very energy dense, and they need to run for a long time. Electric cars work in part because people expect to refuel few couple hours anyway. Enough batteries to cross the ocean is going to be vastly worse.\nThe only useful picture in the article is a \"solar powered board\", which doesn't give a good scale but appears to be barely enough solar power for the rich owner to enjoy their luxuries and will barely move all day while forced to anchor all day. I'm sure it can go really fast on battery power, but not for long. Sails would be a better primary movement source with battery for in harbor navigation or when the wind stops backup only.","parent_id":50467305,"replies_count":2,"hn_url":"https://news.ycombinator.com/item?id=50469485"},{"id":50470686,"author":"YeGoblynQueenne","created_at":"2026-11-12T17:14:50.000Z","text":"So, what does the article say? Do electric ships dream of Android batteries?","parent_id":50467305,"replies_count":0,"hn_url":"https://news.ycombinator.com/item?id=50470686"}]}