Solar-Hydrogen Water Pump
The pump can either be powered with a solar panel or by the hydrogen fuel cell.

Solution

The pump is attached to a solar panel which would use solar energy but at the same time we also have an alternative source of energy which comes from the most powerful and the cleanest fuel which is hydrogen and thus for the same i have attached a hydrogen fuel cell so that we can power up the pump in conditions when solar energy cannot be used or optimum energy cant be derived so as to run the pump.


Costing
Solar panel: 20,000 INR
Fuel Cell: 16,000 INR
Pump: 10,000 INR
Total: 46,000 INR