Optimum hose pipe inner diameter for the new submersible borewell motor

I have dug a 918 feet borewell. The motor is 5 HP 50 stages. Water tank is at 65 feet above ground level and total hose pipe length required is 1000 feet. Please advise me what is the optimal inner diameter of the hose pipe I need to use in the motor? One plumber is saying 1.25 inch some others are saying 1.5 inch.