We've been getting free power off our post (on and off) for for nearly 9 years now, we don't leave it plugged in from the post 24/7, that's why when they changed the post after 4 years nothing could be traced back to us, we charge the battery bank through the night when the light comes on, then when it goes off in the morning we unplug and hide the cable in the bush that we planted at the base of the lamp. A full charge of the battery bank lasts 4 days.