Mike,
The primary control is a dual load astronomical timer.
Load 1 is lights for bill
changer/
vending area, equipment room
door, 2 LED security lights and fixtures for two self serve bays.
Load 2 is the remaining six bays of lights. (12 fixtures)
Both loads turn on 30 minutes before sunset.
Load 2 turns off at 10pm. But, if a bay is in use, that bay’s lights remain on for 15 minutes after the bay timer goes idle. And, if a customer decides to use an unlit bay, that bay’s lights illuminate when the bay timer starts.
Both loads turn off 30 minutes after sunrise.
Why? My records show that I have very little, if any business between 9pm and 6am. There is sufficient ambient illumination from my vacuum island lights, my neighbor’s parking lot lights and the city’s street lights for “security”. Since my project was intended to lower energy costs, I figured there was no need to keep the over-capacity bays lit dusk-to-dawn. Two bays are sufficient to satisfy any late night customers. But, if a bay is in use at turn off time, I don’t want that customer in the dark. And you never know, a blurry-eyed bar patron may decide to wash their car at 2:30am and pull into a dark bay!?!
Just in case I was wrong in my analysis, I can flip switches to add bays to Load 1.
Over-the-top?
The control panel has 6 selector switches, 6 DPDT relays, and a PLR that serves as the 6 Delay-Off timers. And, to make it all work, every bay’s pair of fixtures had to be home run to the control panel.
Yeah…Over-the-top!