In the UK they've thrown serious money at solar PV over the last few years in the form of the FIT (feed in tariff) scheme which is just subsidies (and which has been pretty much bankrupt now for the last several months). The answer to your question is actually in the the two words 'serious money' which the SA govt doesn't have or doesn't want to allocate to the population that might be able to afford the R100,000 plus outlay for a 4kW installation.
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