solar panels

[Skean Dhude]

They are all over the place powering lights linked to radar detectors. So they don't take any power from the mains. I've also seen some on Traffic Lights. Especially those that only operate at certain times of day.

Although they will be OK for powering small items. The biggest panels are on the roof of houses tied into the grid. There are quite a few around and they would be worth acquiring. As they are tied to the frid they will be dead so most people won't know how to deal with them.