{"id":477,"date":"2025-11-20T14:44:28","date_gmt":"2025-11-20T14:44:28","guid":{"rendered":"https:\/\/yachtersworld.com\/?p=477"},"modified":"2025-11-20T14:44:28","modified_gmt":"2025-11-20T14:44:28","slug":"expert-guide-to-choosing-a-marine-generator-for-cruising-yachts","status":"publish","type":"post","link":"https:\/\/yachtersworld.com\/?p=477","title":{"rendered":"Expert guide to choosing a marine generator for cruising yachts"},"content":{"rendered":"

Bruce Jacobs and our partners at Rubicon 3 Sailing explain how to determine the best type and size of genset for your yacht and needs<\/strong><\/p>\n

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It wasn\u2019t long ago that even ambitious cruising yachts had only the bare minimum in electrical systems. Navigation lights, a VHF radio, perhaps an electric windlass<\/a> and a single GPS plotter were about as sophisticated as things got.<\/p>\n

Power demands were modest, and we managed with a decent-sized battery<\/a> bank, topped up now and then by the engine<\/a> alternator<\/a>.<\/p>\n

Modern cruisers are a different story.<\/p>\n

Today\u2019s yachts are expected to run fridges, freezers, laptops, and autopilots<\/a> as standard. These place a heavy drain on the house battery<\/a> bank.<\/p>\n

Add in watermakers<\/a>, air conditioning, or even induction hobs, and you\u2019re into the realm of AC power demands as well.<\/p>\n

This is where a generator can become essential. Not only can it keep your batteries<\/a> charged without prolonged engine<\/a> use, it also powers those high-demand systems that require 230V or 110V AC.<\/p>\n

Choosing a generator, however, is not something many yacht owners will have done before.<\/p>\n

At Rubicon 3, our vessels operate year-round, from the icy seas of Greenland and Svalbard to the Caribbean\u2019s sweltering humidity. In between are many ocean crossings<\/a> and many nights at anchor<\/a>, with our crews relying on their generator for power, heat, refrigeration, desalination, and more.<\/p>\n

It means our yachts need a generator that can handle variable loads smoothly, work hard every day in a commercial environment, and above all, remain reliable.<\/p>\n

Unlike items such as foul-weather gear, where you can try something on and trust a few reviews, selecting a generator is more opaque.<\/p>\n

Manufacturers such as Fischer Panda, Northern Lights, Onan and WhisperPower all have confident sales teams and polished brochures, but once you\u2019ve filtered out the marketing spin, how do you make the right<\/a> choice?<\/p>\n

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Fisher Panda 8000i installation in one of Rubicon 3\u2019s adventure yachts. Photo: Rubicon3<\/p>\n<\/div>\n

Know your load<\/h2>\n

The first step is calculating your expected electrical load, including peak expected draw and a lower \u2018duty cycle\u2019.<\/p>\n

This will narrow the field.<\/p>\n

You\u2019ll find that generators are usually rated in kVA \u2013 their total output, including wasted or \u2018non-working\u2019 power due to inefficiencies in the electrical system. They should also give an output in Watts (far more helpful to know), which will usually be around 80% of the kVA.<\/p>\n

So 8kVA gives around 6.5kW, enough to run the kettle, toaster, battery charger and watermaker<\/a> \u2013 though never more than two at once.<\/p>\n

Check the physical size<\/h2>\n

Once you\u2019ve got a shortlist of models that can meet your power requirements, the next crucial step is ensuring it will physically fit, not just into your engine<\/a> room, but onto your bearers or generator platform \u2013 and, if not, what modifications you need to make.<\/p>\n

Some models are compact and modular, while others are bulky and require greater installation space. It\u2019s not the most exciting aspect of choosing a model, but it is quite key!<\/p>\n

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Rubicon 3 chose Fischer Panda generators for its fleet of yachts because they best suited the firm\u2019s operating model<\/p>\n<\/div>\n

Fixed vs Variable Speed: The Trade-Off<\/h2>\n

You\u2019ll also see that some models are fixed speed and others variable.<\/p>\n

Variable speed generators adapt engine<\/a> speed to the load demand, while fixed speed sets run at one speed, whatever the load.<\/p>\n

Variable speed generators are, therefore, ideal for vessels with constantly fluctuating loads. They\u2019re usually quieter, more fuel-efficient under light loads, and generally more compact. But they\u2019re also more complex and there\u2019s more to go wrong.<\/p>\n

Fixed speed generators, on the other hand, are usually simpler but slightly heavier, noisier, and less efficient when running below capacity.<\/p>\n

Article continues below\u2026<\/em><\/p>\n

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<\/p>\n

Think Beyond the Spec Sheet<\/h2>\n

Equally important to your choice should be after-sales support.<\/p>\n

The most sophisticated generator won\u2019t help you if there are no service technicians or parts suppliers in your part of the world.<\/p>\n

Look at the brand\u2019s service network in the regions you plan to sail.<\/p>\n

Again, quick access to support and spares is not glamorous to prepare for, but you\u2019ll be very pleased that it\u2019s there when you need it.<\/p>\n

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Fischer Panda generator<\/p>\n<\/div>\n

The Reality of Ownership<\/h2>\n

Having worked as an engineer<\/a> on superyachts and managed multiple different generator brands in the Rubicon 3 fleet, i can honestly say this: if a generator is properly installed, operated within its limits, and serviced correctly, most of the major brands are very good.<\/p>\n

I have not found that any one brand stands head and shoulders above the rest in terms of reliability.<\/p>\n

Final Thoughts<\/h2>\n

Choosing a generator for most cruising yachts is part of careful research of the items listed above and the happenstance of which generator is available near you, at the time you need it, and the price you can negotiate.<\/p>\n

Take time to specify it correctly, plan for access and support, and match the system to your operational needs.<\/p>\n

Do that, and whichever brand you choose, you\u2019re likely to have a generator that repays your trust when you\u2019re hundreds of miles offshore or in the wilds \u2013 and that\u2019s what really matters.<\/p>\n

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\"\"<\/a>If you enjoyed this\u2026.<\/h2>\n
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Yachting World is the world\u2019s leading magazine for bluewater cruisers and offshore sailors. Every month we have inspirational adventures and practical features to help you realise your sailing dreams.<\/em><\/div>\n
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The post Expert guide to choosing a marine generator for cruising yachts<\/a> appeared first on Yachting World<\/a>.<\/p>","protected":false},"excerpt":{"rendered":"

Bruce Jacobs and our partners at Rubicon 3 Sailing explain how to determine the best type and size of genset for your yacht and needs It wasn\u2019t long ago that even ambitious cruising yachts had only the bare minimum in electrical systems. Navigation lights, a VHF radio, perhaps an electric windlass and a single GPS…<\/p>\n","protected":false},"author":1,"featured_media":478,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[],"tags":[],"class_list":["post-477","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry"],"_links":{"self":[{"href":"https:\/\/yachtersworld.com\/index.php?rest_route=\/wp\/v2\/posts\/477","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/yachtersworld.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/yachtersworld.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/yachtersworld.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/yachtersworld.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=477"}],"version-history":[{"count":0,"href":"https:\/\/yachtersworld.com\/index.php?rest_route=\/wp\/v2\/posts\/477\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/yachtersworld.com\/index.php?rest_route=\/wp\/v2\/media\/478"}],"wp:attachment":[{"href":"https:\/\/yachtersworld.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=477"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/yachtersworld.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=477"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/yachtersworld.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=477"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}