The main source of your confusion stems from misinterpretation of the phrase "Tesla's solar roof" which is solar roofing material produced by Tesla for buildings rather than a solar roof for a Tesla automobile.
I'm a 'comments first' reader myself but TFAs are generally a must read for context and disambiguation before actually wading in.
I'm a 'comments first' reader myself but TFAs are generally a must read for context and disambiguation before actually wading in.