Thanks for the question. Solar energy engineers are required to hold at least a bachelor's degree, typically in mechanical or electrical engineering. Other areas of studies in which aspiring solar energy engineers can specialize include chemistry, computer science, civil engineering, and related fields, with concentrations in solar energy. Courses for these programs could include energy policy, solar energy and photovoltaics, and geothermal energy.
Hope this helps and good luck!
-Electrical engineers will need to understand circuits, energy transformation, and electrical systems as a whole (grids at micro and macro level)
-Structural engineers will need statics and structural analysis, to know what loads will be applied to the supports for these crazy heavy and expensive pieces of equipment called solar panels
-Industrial engineers may probability, statistics, data analytics, and process engineering to tweak how a solar farm can function more efficiently
-Electrical and computer engineers will learn instrumentation and software development to make the smart technology that tells the solar panels to shift position to maximize sun exposure and provide other vital information for operation