Hein, I will post here - no secrets.
if you have a week and R15 000 - University of Stellenbosch - CRSES - Excellent course (Attendance (cheaper) and Competency options available, which includes an extensive design project for evaluation - Post-grad level). See http://www.crses.sun.ac.za/studies-course-modules-advanced-pv-systems
Terrafirma Academy - various design courses - http://www.terrafirma-academy.com/courses/ (Jhb only AFAIK)
Other courses:
http://microcare.co.za/training/ - in your area?
http://mltinverters.com/ (they have random training sessions on their products - presented by the top inverter designer(s) in SA)
Other suppliers such as Victron? https://www.victronenergy.com/blog/2015/05/18/victron-energy-training-workshops-in-south-africa/ (SA guys a bit snobbish, but good products)
http://pventerprises.co.za/
http://maxx-energy-academy.org/training-courses/
http://www.saretec.co.za/short-courses/view/solar-course-3-super-solar-school.html
http://ncpc.co.za/
http://www.segensolar.co.za/co.za/training
All depends on your budget, time available and inclination.