In my opinion, the major technical challenge that solar power (same for wind power) in finding an efficient technology for energy storage which can make electricity prices from solar competitive with electricity prices from conventional fossil-based power generation.In addition, there are other secondary factors that come after the development of an efficient energy storage technology. These are:1) Availability of cost of raw material used for manufacturing the solar panels (e.g., wafers).2) Reliability improvement of power electronics associated with solar systems.3) Building new micro-grids infrastructures to support the solar farms.Hope this helps answer your question
In my opinion, the major technical challenge that solar power (same for wind power) in finding an efficient technology for energy storage which can make electricity prices from solar competitive with electricity prices from conventional fossil-based power generation. In addition, there are other secondary factors that come after the development of an efficient energy storage technology. These are: 1) Availability of cost of raw material used for manufacturing the solar panels (e.g., wafers). 2) Reliability improvement of power electronics associated with solar systems. 3) Building new micro-grids infrastructures to support the solar farms. Hope this helps answer your question