Hi all!
Sun21 and Planet Solar were built with totally opposite strategy.
But how do they compare in the middle of the Atlantic?
Planet Solar: Bigger is better
Weight: 95 tons
Cruise speed: 4 knots @ 18 kW (24 HP)
=> 190 watts/ton
Sun21: Small is beautiful
Weight: 12 tons
Cruise speed: 3,5 knots @ 1,35 kW (This is under 2 HP!!!)
=> 113 watts/ton
From that point of view, Sun21 is a clear winner.
Regarding their respective solar array, it's interesting to note that the efficiency has improve only slightly over the last years.
PlanetSolar: 93.5 kW @ 537 m2
=> 174 watts / m2
Sun21: 10 kW @ 65 m2
=> 154 watts / m2
Bye!
Pierre
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