Hi I am new to this site and have no electrical training, but I am braving the job of installing 4 5M strips of waterproof(IP68) 5050 RBG LED strips on the interior coping of our above ground pool (approximately 65 ft total length). These lights will shine down into the water but will not be submerged. (This video shows what I am attempting but is not remotely helpful in designing: https://www.youtube.com/watch?v=X6A8XivGYEk). Just jump to the middle somewhere to get the idea.
I have researched the requirements for connecting multiple strands of LEDs and understand that I need an RBG Amplifier every 1 or 2 strands to (a) use a single remote and have them all perform the same function and (b) prevent voltage drop. I have elected to use an amplifier for every additional strand beyond the first one. Each amplifier requires its own power supply.
The ends of each strip will be run under the pool coping to the exterior of the pool. Once on the exterior of the pool I will attach to the controller or amplifier as shown in diagram. As needed I will solder connections and/or use heat shrink and/or non-conductive silicon. My intent is to place the non waterproof amplifiers and the Power supplies in a lockable waterproof survival box mounted to the exterior wall of the pool. (I will have to drill some holes in the box but will make waterproof.)
Being appropriately fearful of 110V and water, I am disinclined to run 4 extension cords around my pool to my waterproof boxes to connect to my 12V power converters. While I believe I can do this with the utmost care and that I can have all connections positioned so that if failure occurs they will not go in the pool, freak accidents happen all the time.
Now to my questions: Is there a way power my amplifiers from a single power supply/converter (which I can place a comfortable distance from the pool)? My understanding is that power consumption should not exceed 80% of the supply's capacity. So if each line of lights uses 75W I need at least a 375W power supply. From that supply, which also needs to convert to 12V, I would need to make a short (~3') 12V run to my first strip of lights, then 2 longer runs (~18') to the nearest amplifiers, and finally a ~36' run to the furthest amplifier. Can this be done? Is there voltage drop to be concerned about if nothing is being powered until it reaches the amplifier? Any advice, product suggestions, etc are appreciated.
Products I am using are on Amazon: SUPERNIGHT-Waterproof-Submersible-Underwater-Controller and SUPERNIGHT-Repeater-Signal-Amplifier-Strip Sorry, as a new poster I was limited on my links.