I now have 4 machines here running on 120V. One is personally mine. The other three belong to wanna4fun, our first customer. (He gave me permission to mention him.)

I have mine set up to exceed Zvi's recommendations for power for the PSUs, and it's getting about 4080 GH/s. I had it getting 4170 GH/s for a while, but that was with a different airflow configuration that allowed me to use more power. The PSUs are currently limited at 1125 W each. It uses the Emerson PSUs. This machine sustained about 4.5 TH/s for 24 hours while in the Spondoolies DC for testing, as I mentioned previously. It's using 2.2.28, because I found it easier to exceed Zvi's recommendations and controls with this version.

The three from my customer are capped at 1100W, as per Zvi's recommendations. They're each hashing stably at around 3950 GH/s. Currently, I'm seeing 3923.69 GH/s, 3951.675 GH/s, and 3982.555 GH/s. These three are all running 2.2.35.

For reference, I'm also getting 1377 GH/s on my April SP10 operating under similar conditions. It's showing much greater temperature sensitivity than the SP30s. In the SP10s performance graph, I can see a slow downward trend in performance as the room it's in heated up, then an upward trend from last night around sunset as the room cooled off again. I see no similar trends in my SP30 graphs. However, the SP30s are in a different room from the SP10, so this isn't a conclusive test.

Intake temperatures are currently pretty high, as I've got them all crowded in the break room of our office space while we finish up our DC. Temperature does seem to affect the propensity of my miner's PSUs to overheat and go into thermal shutdown, but it doesn't seem to affect hashrate directly, at least on 120V. As long as your PSUs are stable at that power output, your hashrate on 120V should be pretty consistent and independent of temperature. According to my observations so far, I think temperature and airflow might make up to 120W (60W per PSU) of a difference in the amount of power you can let your PSUs supply before going into thermal shutdown.

We energized our transformer for the first time today. It turns out we have the option of supplying about 258V, 249V, or a few other lesser voltages. I'm opting for 258V for now. That voltage will probably drop a little bit once we start to get close to our full load capacity. SP30s and most other machines are rated for a voltage up to 264V. We also got to test one of our evaporative coolers and exhaust fans today. It looks like they'll work very nicely.

I should be able to start migrating our machines over to 258V later today. I'll probably have some statistics on 258V to share tomorrow.