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A good questionnaire to help your fill in the right information can be found here: https://www.kgelectric.co.za/assets/support_docs/solar_water_pumping/lorentz_pump%20questionaire_with_diagram.pdf
Franklin Electric has some software available to help with selection. I have never used this latest version but the previous version was relatively good. But you will need the information noted on the form and by RedR TSS.