A curious one..!

6KW is 8HP neglecting losses. That is probably the max rating of the solar cells. with the sun at an angle, clouds etc 4HP useable is more likly. How may folks are going to want to cruise with 4HP?
 
Even w/ 8 hp, I suspect that you are talking less than 5 kts cruise. Add in windage, and I suspect that you won't be "solar only" very often.

Just my opinion.
 
They had a display at Annapolis and claim 6 knots (or was it 6 mph) under solar only in ideal conditions. But you can get more speed by using the diesel.
 
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