A pratical/theoretical question.. is a charge controller always necessary?
Example: A ventilation fan needs to run when the sun is out.
Can I directly connect a 12v solar panel to a 12v fan?
Will it just run in proportion to sunlight?
Will it burn out if too much/little sun?
More generally, to what degree can one build a super simple solar system?
Fridge, fan, and other devices, each with their own simple PV panel?