Sorry to say it but they don't make money with even cheap electricity at the current LTC price. Thanks to the halving they are not going to make anything even at $.05 per Kwh. Then considering the fact that they are well used and could break down on me, and the PSU cost/wear and tear, I couldn't justify using these units even if you gave them to me for free with free shipping. Better to use my capacity on old btc mining gear that will at least give me a slight return for now. I hate to thread crap but these units are basically scrap... These units have gone the way of the old BFL singles, jalapenos, and such gear.
They're boards, not the miner anyways. So i'm not sure how all relevant all that is, but anyways. In term of ROI, if you have free electricity, its about similar as running a stock S1, but with faster ROI because they sell for less.
If you're afraid of wear and tear on 10 years warranty PSU, by running one for the 2 months you need to ROI, then i don't know what to tell you.