IANAL, but if you are to take action it might be most prudent to do so non-destructively.

Putting a bag over the camera/solar panel or taking it down and returning the lost/abandoned property would leave it disabled just as well.

The added damage of outright destroying it would make no real difference to the company (might even just make them more money) but would make it easier to characterize the action as criminally motivated rather than an act of conscience in the public interest.