These are common asked questions by homeowners, installers, distributors, and it is not easy to give a standard answer in every country of the world.
We can classify these solar panel manufacturers/factories by company history, by product types, by brand reputation, by production volume or installed module volume. There are thousands of solar panel brands worldwide, and there are thousands of answers to everybody.
However, three key points have to be considered if you want to find the best solar panels: Material quality, panel efficiency, limited product warranty.
If we only talk about manufacturers’ history, we’d say these brands are the best such as Hyundai, LG, Panasonic, Sharp, Sunpower, First solar who have more than 20 years history in solar business. However, if we classify by production capacity and annual shipment volume, these companies are mainly from China including Jinkosolar, JA Solar, Trina Solar, Longi Solar, Canadian Solar (Canada), Hanwha Q-cells (South Korea), Risen Energy, GCL-SI, Talesun, First Solar (USA), sourced from PV-tech.org 2018.