Ship powered by sun PV-cells


Ship powered by sun PV-cells

Author: David Judbarovski, systems engineering, Israel, retired engineer

judbarovski@gmail.com , Linkedin: David Judbarovski

A real ship of 165,000 ton tonnage with optimal power of 37.000 kW would need about 37,000 * (8000 /1600) / 0.2 ~= 1.0 million m2 PV-cells = 1000 m * 1000 m, can be towed by light foldable sectioned construction being unfolded in open sea and folded before entrance to a port.

Now, such towed solar power plant is no more than 100.0 million USD, while the said ship total cost is 185 million USD. Certainly, we have to consider a costly power storage and three days = 72 hours storage can be quite enough, while I can recommend to use Li-H fuel cells can be as a power source for the ship. A total weight of the said fuel cells is negligible vs. the ship tonnage, while the fuel (Li and H2) of such Li-H fuel cells can be thermally recycled without any interrupting of its work by Joule heat of the said PV-cells’ electricity.  

So here the power storage can be in a form of Li and H2 in three days reserve in a quantity 37,000 kW * 72 hours /(3.5 kWh/kg Li) = 760 ton Li and 110 ton H2 being negligible vs. the ship tonnage, while the H2 storage isn’t a big problem too.  Being pressed at 220 atm., it is 5600 m3 H2 being negligible vs. the said ship total construction. For any emergency cases we can store LiH being a compact solid stuff and to use some conventional fuel (e.g. coal, oil) for thermal decomposing.    

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