I actually just decided I would permanently store my Dolphin M500 Caddy/Power Supply in the Suncast deck container I had out there. I know this may be a touchy thing but I leave my robot in the pool almost all of the time. I do take it out when I add acid for a little bit but otherwise it pretty much stays in the pool other than the daily filter clean-out. The schedule is to have it run all but 1 day a week so seemed crazy to take it out and wrap it up just to undo it all every morning before I leave for work.
Here are some pictures of what I did. I drilled 2x 1 & 5/8" holes in the box. Bought a couple of
these grommets with the screws is the picture attached. Took about 15 minutes but makes it look finished.
The box is about 15 feet or so from the edge of the pool and was located right by an electrical outlet. I was tired of letting the caddy sit out in the sun so I figured what the heck. Makes it easy to keep the power supply out of the rain and so far no issues.