South African energy expert Anton Eberhard has crunched data released by Eskom to find that South Africa's installed rooftop solar PV capacity increased from 983MW in March 2022 to 4,412MW in June 2023. This is a 349% increase in a little over a year.
The main difference between the two technologies is the type of silicon solar cell they use: monocrystalline solar panels have solar cells made from a single silicon crystal.
The best rooftop solar panels have high efficiency ratings and great warranties. The companies providing quotes may differ from those described in our independent reviews.
Solar panels work best under direct sunlight, but they can still generate electricity on cloudy days or in indirect light. The efficiency depends on several factors, including panel orientation, temperature, and shading.
Project Sunroof is a solar calculator from Google that helps you map your roof's solar savings potential. Learn more, get an estimate and connect with providers.
As of 2026, the average cost of residential solar panels in the U. This typically translates to about $2. 50 per watt of installed capacity (more on price per watt below).