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Hey guys,

Total newcomer to the custom firmware and immersion side of things, but I’m a heavy-duty DIY'er who fabricates most of my own gear and handles my own electrical wiring. I've got some big dreams and I'm diving headfirst into a home immersion build.

Right now, I'm piecing together a setup running an S19XP andan S19j Pro submerged in an immersion bath, and I want to tap into the collective brain truston a few design choices:

1. Firmware: Since these are running submerged, what's the consensus on sourcing and running custom immersion firmware (like Braiins or VNish) to safely handle the thermal and voltage profiles?
2. The Power Layout: I’ve got three APW12 PSUs on hand. My initial thought is splitting 4 S19XP hashboards across two of them, but I have no issue fabricating custom wiring harnesses or modifying things cleanly to handle the load. Any specific gotchas with pinouts or power balancing here?
3. The "While I'm Fabricating" Syndrome: Upon cleaning the S19XP, I noticed a 4th plugin for what I assumed to be another hashboard. Upon researching, I saw that the S19XP Hydro uses 4 boards and that I essentially have the same control board. Naturally, the tinkerer voice in my head is asking: “If we're already building custom brackets, wiring, and a loop, why not squeeze 2 to 3 more hashboards into the mix?” Is it feasible to scale up the hashboard count on a standard control board/PSU arrangement with custom firmware, or am I walking into a nightmare with power domains and kernel panics?

Appreciate any advice, warnings, or pointers. Also, if anyone has some custom immersion setups or builds of their own, I'd love to see them!

Glad to be here and ready to build!

Not sure what I'm missing here.

The agent shows Connected in the web dashboard. I've tried adding the miner by single IP and also setting a range. The agent never discovers the thing.

I can access the miner (which is on April 2025 bitmain firmware) fine from my web browser. I can ping it. The agent is running on the same computer and is on the same 192.168.68.x IP address as the s21xp. The miner also has the stock credential/login and hasn't been modified.

Only odd thing I noticed is that if I go into Commander in the webui, then click on Miners, it shows no sites selected even though I have one created. If I click the dropdown carat, it's there, but I can't click the box for the site or the select all box. Just won't let me. Attempts to plug the IP of the miner into the Search box on this screen result in "no miners match your current filters".

Thanks

I have electricity at about $0.022/kWh from 11 PM to 7 AM. I’m having two dedicated 240V 20A circuits installed in my garage with NEMA 6-20R outlets.

Thinking about buying two used ASIC miners and running them only during those 8 cheap hours. Not looking to spend a ton upfront.

Any recommendations on which used miners would make the most sense? Is 8 hours a day enough to get a decent ROI, or does the limited runtime make it not worthwhile?

Also curious about heat/noise and whether WiFi is fine instead of Ethernet.