Heck no, they just sit there....
I have no idea how much / what the panel would power on it's own....I have it to keep the batteries topped up. I know it "works" because my battery
voltage increases measurably after an hour or two sitting in the sun. (open circuit test)
I know it's not much...because with the panel plugged in (exposed to sun) and only one interior, non-LED, light
(there's also a little draw from the fridge
controller that is ALWAYS on) the voltage is steady....as soon as I turn on one or two more lights
the voltage starts to drop......(I'm certainly no expert but that's telling me I am now in a deficit situation power wise)
The reason I have/use it is to keep the batteries (paid big $s for two GC batts.) as topped up as I can because drawing them down below 50% (12.1V) shortens their life span.....(at least that's what I've read)
It might not be much power minute by minute....but imagine being away from the trailer (zero power usage) for six hours and having the panel "working" the whole time in the sun....