where does the transfomer box need to go

According to the manual, in full sun, away for locations with street lights and 10ft from a pool or hot tub.

Outside, in an area that gets sun, so it can tell when it gets dark. By that I mean don't put it UNDER a porch or under a plant.. I put mine on the side of my house where I had an electrical outlet. They have an optical sensor that reads the light.

Hello and Thank You for your question, the Transformer is designed to be installed outdoors, near a outdoor electrical outlet. It simply plugs into the outdoor wall of your home. The kit comes with everything you need to get the lighting system installed.