And hydrogen would be an important feedstock, so maybe that "hydrogen economy" thing might happen after all.
Assuming a standard solar panel and conditions, a 1sq meter panel captures about 700 watt hours per day.
I'd guesstimate the creation is less than 10% efficient, meaning you need 10-11 square meters of solar panels per serving produced per day.
Processing plants or fungus or bacteria from bioreactors is orders of magnitude more efficient.
from Louis de Funès The Wing or the Thigh/L'aile ou la cuisse (1976)