How to Charge an Electric Boat, From Shore Power to Solar
One of the most common questions from boaters considering the switch to electric is deceptively simple: how do you charge it? The good news is that charging an electric boat is far more straightforward than most people expect. You do not need a dedicated charging station, specialist equipment, or a marina berth. In most cases, a standard power outlet and an overnight window is all it takes. But the charging landscape is evolving fast, with DC fast chargers, solar supplementation, and smart tariff strategies all playing a role. Here is the complete picture for Australian boaters.
Level 1: The Standard Household Outlet
The vast majority of electric boat owners charge from a standard 240-volt, 15-amp household outlet, the same socket you would use for a caravan or a workshop power tool. This is Level 1 charging, and it is the simplest and most accessible option. For a boat with a 50 kWh battery bank (a typical size for a mid-range electric catamaran), a full charge from a standard outlet takes approximately 14 hours. Plug in when you get home from a day on the water, and the boat is fully charged by morning.
This works perfectly for the way most Australians boat: day trips followed by overnight recovery at home or at a powered campsite. If your boat lives on a trailer in the garage or carport, you already have everything you need to charge it.
Level 2: Marina Shore Power and Upgraded Circuits
For faster charging, a dedicated 32-amp or 50-amp circuit (the kind found at many marina berths and caravan parks) can roughly halve the charging time. This is Level 2 charging, equivalent to what most electric car owners install in their homes. Marina shore power connections across Australia typically offer 15-amp or 32-amp circuits, and most electric boat chargers can take advantage of whatever is available.
The cost of charging at this level is remarkably low. Australian residential electricity runs approximately 30 to 35 cents per kilowatt-hour at standard rates. That means a full 50 kWh charge costs between $15 and $17.50. On off-peak tariffs (typically 8 to 15 cents per kilowatt-hour, available in most states between roughly 10 pm and 7 am), the same charge drops to $4 to $7.50. Compare that to filling a fuel tank on a conventional boat and the savings are immediately obvious.
DC Fast Charging: The Emerging Frontier
The game-changer on the horizon is DC fast charging for boats. UK-based Aqua superPower manufactures marine DC fast chargers delivering up to 350 kW, which can charge a large battery bank to 80 percent in just 20 to 60 minutes, comparable to the fast-charging experience for electric cars. Electric yacht manufacturer Volta Yachts reports that their 200 kWh battery can be charged in approximately 56 minutes at 100 kW, demonstrating that the technology is already production-ready.
In Australia, marine fast-charging infrastructure is still nascent. The country's first marine DC fast charger was installed at The Quays Marina in Church Point, Sydney. It is a single installation today, but it represents the beginning of a network. As electric boat adoption grows (the global market is expanding at 10 to 19 percent CAGR according to MarketsAndMarkets and Grand View Research), demand for marina charging will follow, just as it did with electric vehicle charging stations on roads.
Solar Charging: Australia's Secret Advantage
Australia's abundant sunshine makes solar charging a practical supplement for electric boats, particularly catamarans with their wide, flat decks. Marine-grade solar panels from manufacturers like Solbian and SunPower achieve efficiencies of 25.4 to 25.5 percent and weigh just 2.5 kilograms per square metre, making them ideal for rooftop installation on boats where weight matters.
In northern Queensland, where solar irradiance exceeds 5.5 kWh per square metre per day, rooftop panels on a catamaran can contribute meaningful energy to the battery bank while the boat is at anchor, on a mooring, or even underway. The Solar Sal 24 demonstrated what the industry calls infinite range at 5 knots using 1,440 watts of solar panels: the solar input matched the power consumption at low cruise speed, meaning the boat could theoretically run indefinitely in good sun conditions.
Solar will not fully charge a large battery bank from empty, but it can meaningfully extend range, top up the batteries while anchored for lunch, and reduce the amount of shore charging needed. In a country with as much sunshine as Australia, it is a natural complement to plug-in charging.
Smart Charging Strategies for Australian Boaters
The smartest approach combines multiple charging methods. Charge overnight on off-peak tariffs at home for the lowest cost. Use solar panels to top up while on the water or at anchor. Take advantage of marina shore power during multi-day trips. And as fast-charging infrastructure expands, use DC chargers for quick top-ups at supported marinas. For most recreational boaters, the home outlet and solar combination will cover the vast majority of charging needs.
Cat Cruisers vessels are designed with this flexibility in mind. Our amphibious, trailerable catamarans can charge anywhere you can park and plug in: at home, at a caravan park, at a friend's waterfront property, or at a marina. The twin 5kW E-Class electric motors in the 650 deliver six hours of runtime, and an overnight charge on a standard outlet brings you back to full. It is genuinely as simple as plugging in a caravan.
Want to see how charging works in practice for an electric amphibious catamaran? The Cat Cruisers team is happy to walk you through the details. Get in touch at catcruisers.com.au/contact.