Here is a list of the 12 teams originally registered for the SASOL Solar Challenge in South Africa. This event has now been cancelled due to Covid-19. Check out the official social media at:
(click on the icons).
Alfaisal Solar Car Team

Classic symmetric challenger (Areej 1) – they originally registered for ASC 2018 and WSC 2019, but withdrew from those events. Their car name is a pun: AREG/Areej is an acronym for Alfaisal Renewable Energy Group but also means “the scent of a flowery garden” in Arabic. Their car appears complete.
Beijing Institute of Technology 
Four-seat cruiser (Sun Shuttle IV) – this team did well last WSC. They are rebuilding the Sun Shuttle III from that race.
Previously, Beijing came 19th at WSC 13; came 24th at WSC 15; and came 6th in the WSC 19 Cruiser class.
Eolian AutoSolar

Cruiser (new car: Auriga ) – this team is new to the South African race, I believe. They had hoped to attend WSC 19 (after coming 14th in 2007) but were unable to do so. Given the limited time remaining, I’m not sure that they can make the race.
Mines Rabat Solar Team

Asymmetric challenger (new car: Eleadora 2) – they have worked hard to complete this car (see this video).
Previously, Mines Rabat participated at MSRC 19.
Tokai University

Monohull challenger (Tokai Challenger) – they are hoping to attend both the South African event and the WSC.
Previously, Tokai came 2nd at WSC 13; came 3rd at WSC 15; came 4th at WSC 17; came 2nd at WSC 19; came 7th at Abu Dhabi 15; came 2nd at SASOL 16; and came 2nd at SASOL 18.
Cape Peninsula University of Technology 
Monohull challenger (new car: Solar Flyer II) – they appear to be building a new car.
Previously, CPUT came 8th at SASOL 18.
Central University of Technology (Seilatsatsi)

Challenger (new car: Ntsu) – they appear to be buidling a new car. The motor, battery, and panels have apparently been outsourced.
Previously, Seilatsatsi came 7th at SASOL 18.
HTS John Vorster Sonkarprojek 
Asymmetric challenger (new team with car: Volt Wagen) – this is a new team, from Hoër Tegnologiese Skool John Vorster in Pretoria. Their car is the old car from Tshwane University of Technology, with improvements.
North West University

Challenger (Naledi II) – they are looking to reclaim the “best South African team” title, which they lost to TUT in 2018, by heavily modifying their original Naledi. So far the car looks good.
Previously, NWU came 11th at WSC 15; participated at WSC 17; came 4th at SASOL 14; came 4th at SASOL 16; and came 5th at SASOL 18.
SolarFlair
Challenger (new team with car: SolarFlair SP 400) – this team is from Mbombela in Mpumalanga province.
Sonke
Challenger (Siyakude II) – this high-school team is returning with a rebuilt car.
Previously, Sonke came 6th at SASOL 18.
Tshwane University of Technology (TUT)

Challenger (new car: Sun Chaser 4) – they hope to make their new car 25% more aerodynamic and 20 kg lighter than Sun Chaser 3. They discuss their 2018 race optimisation approach in this paper.
Previously, TUT came 6th at SASOL 16 and came 4th at SASOL 18.
This page last updated 20:41 on 26 January 2021 AEDT.