This electric boat went 420 miles in 24 hours


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C-8 spark plug
C-8 spark plug

The electric distance record is  Candela C-8 the mass-produced hydrofoil boat made in Sweden. He set the record for the distance traveled in one day of 420 miles in 24h, in waters near Stockholm. Candela’s team combined charging technology with boat speed to achieve the result.

Candela C-8 – Record electric boat

The latest version of the Candela C-8 foiling hydrofoil covered 420 nautical miles (777km) in 24 hours in the Stockholm archipelago, taking advantage of fast-charging dock breaks. The previously stated record was 79 nautical miles achieved in 20 hours .

“This feat shows that fast, electric long-distance transport is feasible today, not in the distant future. We now have the technology to move to sustainable maritime transport” says Gustav Hasselskog, CEO and founder of Candela, who piloted the C-8 during the record attempt.

The C-8 uses hydrofoil technology to reduce energy consumption by 80 percent compared to displacement sailing. This already translates into 2 to 3 times the range of conventional electric boats.

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How did Candela do it?

But the secret that made the record possible is that C-8 can be recharged quickly, on direct current, thanks to Candela’s partnership with electric car company Polestar, which provides both the batteries and the charging infrastructure.

Yes, the record was achieved by charging the Candela C-8’s batteries with Northvolt ‘s 281kWh Voltpack mobile battery storage system, which allows DC charging on the dock. So not a true endurance record, but a test situation in the concrete, of what could be future performance in a future where ports are equipped with charging stations.

The route included a 20-mile loop nautical rides between Stockholm and Frihamnen the island of Tynningö, with DC charging after each ride. The average speed during the 24-hour run was 17 knots, even taking into account recharge breaks.

The record distance race offered several insights into what can be achieved with Candela’s electric foiling boats combined with the network of DC charging stations that will one day appear in our harbors.

The C-8, traveling at full speed, 27 knots, most of the time, consumed 685 kWh during its journey, costing about 110-120 euros in electricity. In contrast, a conventional gasoline boat would have consumed about 750 liters of gasolinea, at a cost of about 1.400 euros.

During the 24 hours, the C-8 charged for a total of 313 minutes and received a total of 615kWh of electricity. Each charge took about 18 minutes, and the battery was charged from about 13% to 66% state of charge (SOC). The C-8 spark plug had an average charging rate of about 118 kW.

Looking to the future, Candela points to the world of commercial vessels having launched the P-12 Shuttle, a 30-passenger hydrofoil on which foil and electrical testing continues in search of new records.

C-8 Spark Plug Specifications

Length: 8.5 m (27 feet 11 inches)
Width: 2.5 m ( 8 feet 3 inches) Draft: 1.5 m (4 feet 11 inches)
Weight: 1,600 kg
Engine: 45-50 kW C-Pod spark plug
Battery: 69 kWh
Charging: AC charging type 2, DC up to 135 kW
Autonomy: 57 nautical miles at 22 n




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