The fourth quarter of 2020 saw a sudden surge for Tesla’s solar rooftop revenue, and Elon Musk now says he thinks it won’t take long for the company to become the clear market leader in solar. Naturally the big overall story for Tesla’s 2020 is producing 500,000 electric cars, and aiming for 100 GWh battery capacity production in 2022 across both EVs and energy storage. In comparison, its solar arm has been comparatively neglected for the past couple years, by Musk’s own admission in the Q4 earnings call; some solar staff had been reassigned to the EV department. Musk mentioned that Solar Roof production ramping had a significant impact on energy gross margins in 2020; and for 2021, he specifically…