Daylight was used to make contact prints on 'printing out' paper. Often north window light, which is a little more uniform throughout the day. Cyanotype, kallitype, and platinum printing processes are all contact print processes, and all work well under sunlight. Remember that cameras only got small much later, necessitating projection enlargements.
I have no electricity at my cottage, so I do contact printing outside (for the 4x5) and for enlargements, I have fitted a 12V incandescent bulb ("marine bulb") to my enlarger, and it is powered by a car battery. I charge up with jumper cables, but I'm thinking of adding a solar panel this year.