Solar Boat Sets Sail Again


The Gisborne family has completed a 12-day trip on their solar-powered electric boat, the Loon. The Gisbornes travelled the Erie and Oswego canals for 12 days before reaching Albany, New York. Monte Gisborne, the captain, said this will mark the first time anyone has traveled an American canal system using solar electric energy as the primary fuel source.

The Tamarack Lake Electric Boat Company designed “The Loon” — it’s a pontoon boat with 738 watts of solar panels mounted on its cover, and a 30 mile range on its 48 Volt deep-cycle battery array. It has a top speed of a 5 MPH.

The boat is “solar-assisted” because it has a built-in battery charger that allows users to augment the solar energy input with electricity from the utility grid, usually from shore power available at marinas or dockside. Electric boats, unlike gas-powered boats, eliminate the discharge of hydrocarbons into waterways.

Monte Gisborne, in an interview, said this about the efficiency of the boat:

The primary consideration here is that internal combustion automobiles and boats, even in this advanced age of computers and emission controls, are horrendously inefficient. We just cannot seem to turn the energy available in a litre of gasoline as efficiently into mechanical energy as we can into heat.

Negating the obvious benefit of solar, and assuming that my boats will get 100 per cent of their energy from the grid, my system efficiency is at least eight times more efficient than the equivalent gas-powered boat, meaning that I can travel at least eight times as far on a unit of energy than the most efficient gas-powered boat.

The actual truth is that a 1969 Chris Craft boat with twin 454-cubic-inch engines (not uncommon on the waterways) is so horrendously inefficient that my boat costs only 1/150 of the fuel costs to run per km.

Generally, the solar panels provide you with about 16 km of free travel on a sunny day. For most customers, 16 km is ample and, even if you travelled 32 km one day, as long as you don’t use it the next day, you’re fine and the batteries will catch up.

Generally, these are weekend toys that soak up the sun all week long, gathering a charge for the weekend.

Via: Groovy Green and the Globe and Mail

1 thought on “Solar Boat Sets Sail Again”

  1. I want to build a prototype utility boat for isolated South Pacific islands, lat. S. 10 degrees, where fuel purchase or shore power is unavailable.. It needs to carry a payload of around 750 kg.
    Requirements are for a stitch- and- glue plywood boat, pre-cut in Australia, for island assembly using guided local labour.
    Solar power, sail, paddling, and poling, need to be built-in propulsion options, for safety and to maximize the of range of the vessel.
    This suggests a light weight craft, easily driven, stable under moderate sail. and usable in waves up to half a metre. A load capacity of about 750 kgs. is required. Total weight, 1,500 kgs.

    An open catamaran, about 18 to 22 feet, with good capacity canoe-style hulls would fit the bill.
    When the waves are up, so is the wind, which means the boat will be sailing at those times, saving on stored solar electricity.
    A capacity of 2 hours electric drive time at 4 to 5 knots would be an acceptable.
    Are you able to suggest size of solar panels, batteries, and electric outboard for such a vessel ?

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