Seems like you're looking for something like THIS. I'd just measure to make sure the power supply fits.I have the exact same question. Margaret told me to put it in some sort of waterproof container, but I don't have any good ideas. My ideal plug is out near the pool in a flower bed...would allow me to avoid the cord laying across high traffic area of decking.
I'd like to keep the control box out there in or near the flower bed and set up my S300 for 3 times per week cleaning.
Anyone have a great solution for this?