What are the capacities at which solar water pumps are available and what is the average discharge?

The motor pump set for irrigation and domestic drinking water should have a capacity in the range of 0.1 HP to 5 HP. Although, municipal and rural community applications could choose a higher capacity solar pump. 

For a DC motor pump set, the discharge varies from 14 - 100 litres of water per watt peak of PV array while for AC motor pump, the discharge varies from 13 - 19 litre of water per watt peak of PV. The average discharge, however, depends on solar intensity, location, season and other factors. 

The details of the technical specification can be found here.