Marco,
Here's another method that you can print to a sheet of paper. I
published this in Home Power in 1989 and it's been widely used ever
since. So it's an unusual approach, but proven to be consistent with
published charts regardless of voltage. It applies to DC and "simple"
AC as you'll see.
http://www.conergy.us/PortalData/3/Resources/products/solar_pumps/pdf/wire_sizing_chart.pdf
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