240V Antminer Dryer outlet help!

[Kqazi281]

Hi All,

I am new to the forum. Thank you guys all of the help and support on the forum so far.

I just recently purchased a Antminer S19j Pro 100T and I want to run it on an existing dryer outlet.

I believe I have a NEMA 14-50 outlet. Would something like a NEMA 14-50P RV/Range/Plug to (4) NEMA 5-15/20R 20Amp,1.5FT,Dryer Male Plug Household Adapter Power Cord,RV Distribution Adapter Cord work to run this machine? Is it possible for it to run two antminers on this adapter if I purchase another antminer in the future? The cables that came with the Antminer are 5-20P to C13.

My math so far. Nema 14-50 is a 50 amp plug and each antminer S19j Pro requires 20 amps (10 amps from each cable) thus if I plug in 2 machines using this NEMA 14-50 to 5-20R adapter, I can power 2 machines 40 amps total with 20% buffer.

Thank you all for your help. Not sure if I am allowed but here is the amazon link to the product in question: https://www.amazon.com/yodotek-Household-Adapter-Distribution-Approvaled/dp/B07V1J9BD5

[du5tin]

Hello!

This adapter is probably not going to work for you. The S19 series loves 240V source voltage. This adapter will give you 120V at each cable outlet which will likely max out the current rating on the cables going to the miner.

The other thing is technically a code limitation in Canada at least… NEC is similar I believe. Plugs cannot be fed with a breaker bigger than their rating. So the 50A breaker feeding the adapter with 20A plugs would be too large. If a cable shorts plugged into the adapter it could burn up because the breaker feeding the adapter will allow a higher short circuit current.

If you want to adapt down from a 50A plug, as an electrician, I would recommend using a small sub panel with a couple 2-pole breakers feeding each miner. I know that’s a bit more work and cost but it’s a lot safer and will help keep everything safe reducing risk of fire.

What I did for my setup was run a wire from a 2-pole 20A breaker in my panel to a junction box. I cut off the male cord ends for the miner cables and entered those cables into the box. Then spliced those wiresonto the wires from the breaker. Avoids the plug code limitations and also makes the miner easier to turn on and off because both cables feeding it switch with the breaker. 

[Artemis3]

Just because your plug is 50A rated, doesn't mean the circuit actually is, so check that first, and its breaker.

Then, you need an adapter to provide two plugs. Your source of power is the two prongs on the sides, nothing else. Of course the (round) ground prong is nice to use, but ignore the 120v flat prong in the middle.



I'm not sure about that specific adapter, assuming its providing two 240v and two 120v (red/green dot ?), just use the two 240v.

BTW: 3250W/240V=13.54A therefore it would be 14ish each not 20, so both would be 28A, but don't add a third one because you have to keep the 20% safety margin always, and 80% of 50A is 40A so assuming a 50A circuit (again, check), then up to a 40A load you are good.

Well yeah, its even better to protect each plug individually, or separate the circuits to begin with...