Yes there is a chance they may cherrypick those units (and your pending M20 as well), so there is no choice but to accept an early review, and then later a second review when "production" units are available. So, an early review, and then again another from a following batch etc. Can be from different reviewers, don't take all the burden yourself
I'm guessing the S17 will be 40~45 watt a th. Since you have a voltage regulator you can measure them 240v, 220v and 208v for science.
If i were to guess, Bitmain may be publishing stats based on the chips themselves (20v DC), or the whole unit plugged to Chinese mains, which is 230v@50hz.
All that current transforming causes some loses. One thing to always keep in mind for you people using renewable, is figure a way to avoid inverting in the first place. I mean, if your panels make 24v and the Asic boards take 20v, shouldn't the whole dc-ac, ac-dc be skipped altogether? If you can ever pull that (skip the PSUs, direct feed the units) you are going to be more efficient than everybody else.
To begin with DC tends to lower its voltage on its own, use a long enough wire and it might already be down to 20v by the time it reaches the unit... Else you could figure out DC to DC psus, they exist for regular PCs and servers (especially useful if your input DC is too different, ie. 48v or 12v, or mostly to buffer voltage variations from the input (such as when you turn on/off another unit) and ensure steady 20v to the output.
All out direct dc panel to miners have been a fail. Can't stay stable say 12 volts (L3+) with out a ton of batteries and caps that then makes it too costly. every dc to dc psu wants very stable dc in.
Our off grid setups have not worked well so far.
We wanted a doghouse with 4x 320 watt panels to run an L3+ lots of time and money tossed at products that don't work well.
All off topic though.
Yeah a few s17's will get ordered.
Maybe only 1 at a time as 2000 + 500 trump tax = 2500
Say the pro doing 62th at 2800 watts 62th is 370 a month usd in btc I get ½ or 185 a month so 2500 /185= 13.5 month for payoff
if gear is 2300 I could be looking at 2875/185 = 15.5 months.
while the m20 doing 72th earns 430 usd a month in btc I get ½ or 215 I paid 2048 + 560 = 2608/ 215 = 12 month payoff
so m20 is just as good as a s17.