So the plan is to intermittently run a few pieces of machinery in some savanna when it isn't raining or dark?
Cloud cover reduces the amount of solar power generated by up to 25%. Being close to the equator, the day/night cycle is a lot more consistent, so you can plan your power usage or charge a battery.
Or maybe instead they can go to any of the industrial centers in Africa, hook their machinery up to a power grid (powered by WHO CARES, it comes outta the wall), and actually do something sane.
Drawing power lines and constructing a power grid is expensive as Hell. Which is why solar power is so interesting: The solar panels could be on your roof, compared to a power plant 10 miles (or more) down the road.
The ability of a solar panel to scale downwards to individual use cases is a nice feature of it. But it doesn't stand to change a status quo like "put your industry next to the other industries" in America, and it sure won't in Africa either.
Most industry operates during the day time where solar panels produce energy. There has also been a number of considerations on building collosal solar power plants, e.g. in the rocky deserts of the Sahara and Nevada. IIRC they suggested that it was possible to construct solar plants in Sahara that could power the entire energy consumption of Europe.