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John Jacobs gravatar image

The simple answer is that you need to lift 2000 kgs of water 70 metres Energy required is expressed in the formula E = Mass x Height x gravitational constant E = 2000 x 70 x 9.8 = 140,000 J. Power (Watts) = E/s. If we assume a flow rate of 0.5 l/s pumping would be complete in 1 hour. I'm not sure if this is accurate for a 1.5" pipe but will do for a rough estimate. Watts = 140,000/3600 = 39. taking into account DC/AC conversion losses, motor efficiency losses etc. I would add a 50% factor. Therefore you should consider at least a 60W pump.