While I applaud your idea, and willingness to share with the community, you still have more to consider.
The problem is, there are other variables. PSU quality/80Plus rating, 120v vs 240v, even the quality of power from your power company has some effect on the # of watts at the wall. Not to mention, these S3's tend to vary all over the +/-5% manufacturer's acceptable tolerance range. Much more so than the old S1's anyway.
But here, I'll share what I have. 2xB1 S3's clocked at 225mhz averaging 455GH each on a single EVGA 1300G2 (80Plus Gold) pulled about 720W from the wall. Right in line with what most people are reporting for 225mhz on gold rated PSU's.
Thanks, I think what I'll do is put up a default for the device but allow you to change the wattage for each frequency if you want to spend the time to figure out what each of them are for your device/psu. It's the same as going to one of those profit charts where you can preselect a miner and see what it might earn. Obviously an Antminer S1 at 180gh isn't common, it'll be 176gh or overlocked to 200gh, etc. So providing the same kind of flexibility to enable you to change it would be ideal.
At the same time, if you run a lot of these units together and want to just assume a base average among them, having some idea if downclocking would result in more profit would be handy. I'm writing it for myself but will make it available to all. Then just improve it where good suggestions like yours come in and make sense.
Thanks again.