I just had the 4 gang box and 3 outlets laying around so I thought what am I gonna do for the 4th.. So I went to my local store and thought about the few USB circulating fans I had bought so I just bought that thing to go in there . The wiring nuts are in there because I started with a diffrent diagram and finished with my own thoughts. Lol I wired it into the electrical line and it works!!!!Why all the wire nuts? I'd just run solid, and use the push in slots instead of the screw clamps.
Not sure what you're using that for. All 4 of those are wired together. Remember you've only got 15 amps on that.
Either a single 1000 watter or 2-600's is all that'll run unless you split it up into two different circuits.
For all that you could have just bought a 15amp power strip with like 6 outlets for a couple bucks.
Looks good though, and DIY is half the fun of growing in my book.
The USB ports are slick. I'm gonna keep that one in mind if you don't mind, lol.
Peace.
Tav