1. Sahara Desert:
- Northern Sahara (Algeria, Libya, Egypt): 10-12 hours per day
- Southern Sahara (Chad, Niger, Mali): 10-12 hours per day
2. Namib Desert:
- Coastal Namibia: 8-10 hours per day
- Inland Namibia: 10-12 hours per day
3. Kalahari Desert:
- Botswana, Namibia, South Africa: 10-12 hours per day
4. Danakil Desert (Ethiopia):
- Northern Ethiopia: 10-12 hours per day
It's worth noting that these values are approximate and can vary depending on the time of year and the specific location within the desert. Generally, deserts in Africa experience high levels of solar radiation and clear skies, making them suitable for solar energy projects.