I'm in the process of upgrading a little GPU mining operation to add some more rigs but I've outgrown my garage's power capacity. I'm pretty handy with DIY, but this would be my first time tackling anything more complex electrically than replacing switches, outlets or installing a ceiling fan and it would be great if I could get some feedback on my ideas.So here are the basic requirements:I currently have one 8-GPU mining rig that draws about 1300W/11A on my 120V circuit. I'd like to add enough additional power to power 4 more identical rigs. The new rigs I'm building will be running 220V power supplies (and I'll be using 240V on my current rig as well, though it is 120V now) and my understanding is that will cut their measured amps in half. So essentially, I'm thinking I'll have five, 5.5Amp, 1300W servers to balance.Another requirement: I want to move all the rigs out to my garden shed after winter, so I'd like the solution to be somewhat easy to relocate. It's okay if it looks a bit odd in my garage for a little while.Constraints:I have a 100W main lineI have only 5 spaces left on my main panel, 3 on one side, 2 on the other.Design:So with those things in mind, I figured I probably didn't have enough space in my main box to add enough circuits and sub-panel would be easy to relocate when the weather was nicer. I've been doing some research on this and here's where I'm at with the basic design: Basic Design DrawingI thought three 20A circuits would give me some room to grow. If I put two 20A circuits, I thought I MIGHT be okay with three machines on one, but with 16.5A on a 20A circuit, I didn't have much room to mess up (and when I'm performance tuning and playing with GPU core/memory voltages, it's not uncommon that my settings won't work and the system will default to much higher power settings, which could spike the circuit very high. I figured with 2 machines on each 20A circuit, I had a lot of room to mess up with performance tuning.*Some things I'd love to get feedback on: *This is my general space: main panel There's a little wooden panel in the lower left corner. I guess it was from a previous access or maybe a very poor repair by the previous owner. I think I can cut that away a little bit of that board to facilitate getting a small LB mounted there (like April Wilkerson does at this point in this video except on the bottom.) My GUESS is that I could use a little box adapter on the bottom of the main panel (looks like there are some spaces available on the lower left or right), cement in a little elbow bend that would go into an LB fitting. Can anyone comment on whether or not that is the right way to do that? If not, how should I come out of the bottom of the box? I have pretty easy access to all the wires coming out of the top of the main panel. If it would better, I could maybe run the main connection through the wall? I just thought the surface mount would make less permanent changes to the garage.I'm planning to use PVC conduit. Any comments on the wire types and sizes I've selected? Is that the appropriate NEC wire sizes and types for this application? This is the basic space I'll be running the machines in for a while and here is a super photorealistic 3D mockup I did of what it would look like.Assuming this design is okay, what diameter PVC conduit would be appropriate for the THHN #8 service feed and the two sets of THHN #12 going to the 2-gang boxes?Any concerns with having this going through a 50A breaker? Should it be higher? Lower? My total amps current should never really exceed about 30, I thought 50 would give me a good ceiling, and allow me to grow if I ever wanted to add another machine to Load 1 to make it a double-rig like the other two (if I did that, I'd have three 11A continuous loads (33A) and still have 8 amp capacity on the 110 before I'd hit 80% of the 50A breaker. via /r/DIY http://ift.tt/2HaQaGr
