Ian
I made a few assumptions in suggesting a 25% output over a 24 hour period.The way I reasoned it was that at least 2/3rds of the day is without direct sunlight. Commercial farm panels
may have a degree of solar tracking associated with them, which would increase output, but they also lose efficiency above 26degs). I reduced the overall output to 25% to allow for cloudy or partially cloudy days. Now I concede that this is not a hugely scientific approach, but I thought it would do to question the figure apparently stated by Sanjeev Gupta.
My calculation is therefore 280 x 6 x 365 = 613,200MW per year, which is 613GW, which is not 10GW.
More of an issue is how is that five times the requirements for SA? Their website maintains SA demand is 1.65GW per year!! My calculations are 1200MW (Purely an average observation as I have seen >2000MW and < 1000MW) x 24 x 365 = 10,512,000MW which is 10,512GW. Unless I have messed up the figures (which has been known to happen so please correct me if I am wrong) there is a big discrepancy there. This is not a journalistic mistake. It is from their website:
Enough renewables to meet SA’s needs five times over: Sanjeev Gupta’s plan | Repower Australia
Regards
Paul