2/3 of sunlight falls on the oceans, unlikely to be developed as technological solar farms. Marine environments are exceedingly harsh. You can also discount Antarctica. We're already down to ~25% of the grand total surface are, and hence energy.
Panel efficiency (~<20% typically), spacing factor (shaded panels generate no power), and further losses greatly cut into the remaining surplus. In net, ~1-10% of the resource might potentially be available. And other terrestrial ecosystem resources need their own cut.
There's still a possible surplus relative to present consumption, but the margins begin to look uncomfortably thin. Population growth and expansion of industrial standards of living cut further into that, as discussed up-thread.
Expressed as population, area, and energy, over time, the plots are interesting.