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Your total dynamic head (TDH)of 45' feet you provided isn't enough to give you the exact size of the pump that you may need.
If you can give us your tank capacity we will be able to advice you what size of submersible pump you can use for your farm project. We have compass software to calculate and pick your pump size and specifications for each project. Pump manufacturer links: www.lorentz.de/solar water pumps.lorentz manufacture more than 100 pumps for various applications