Report KD 776 has been added to the menu KD-reports. The title of this report is: “Calculations executed for the 3-bladed rotor of the VIRYA-4S windmill (lambda design = 4.25, galvanised steel blades) for connection to the generator type PMG380-I-5KW-500R or PMG380-I-3KW-300R for 48 V battery charging, water pumping or grid connection”. In chapter 9, three options are given how the VIRYA-4S can be used for water pumping.