Quote from: Artemis3 on February 22, 2019, 12:10:38 AM

Unfortunately that is going to prove challenging with the latest Bitmain models, where the psu is customized. Which is a big issue if, for example the S15s failure rate at 240v really is higher than usual. Where do you get a replacement PSU not made by bitmain?

yeah but we don't really know if they will have a lot of issues at 241-247 volts.

I can tell you this that these two transformers are too costly and will only do 1 s15 not 2.

this one has a lifted ground = not too safe
this has 14 maybe 15 gauge wire input which can not handle 2 s`15's

https://www.ebay.com/itm/Norstar-5000-Watt-Step-UP-and-Down-Voltatge-Regulator-Transformer-Converter/332955089461?

this one wastes about 2.5 maybe 3% to do the 220 volt leveling
it is 14ga or 15ga
the two 220volt outputs are chained wired internally with 14 gauge wire should be 12.

and an internal wire had its insulation nicked and could short.

https://www.ebay.com/itm/Norstar-4000-Watt-Step-Up-and-Down-Voltage-Transformer-with-Voltage-Regulator/332607784072?

so while they are not super costly they are not good enough to use.

larsonelectronics has better gear but it is not cheap

https://www.larsonelectronics.com/

https://www.larsonelectronics.com/p-153799-1-phase-buckboost-step-down-transformer-240v-primary-229v-secondary-at-4367-amps-5060hz.aspx

this should do 3 s15's it most likely could do 4 but I would only want to do 3

it will cost 1-3% power loss and at 197 plus shipping it is not that cheap.

it is just a straight step down which means 11 volts less out then in.

so if you have power that goes from 237 to 251 like I do it would be a decent choice for 3 units.

If you are going to run 5 units you need a bigger boat so to speak.

this one could do 8 s15's

https://www.larsonelectronics.com/p-147785-.aspx cost 673 plus shipping

it would drop power from 242 to 220

you would need to feed it with a 150 amp panel then make outlets for the output.

But it is all conjecture since we are not fully sure how the bitmain psu's will stand up.

no one else has come forth to claim an issue with the psu's so it may not be an issue.

I will say this the apw3++ can do 245 -247 with out any problems. I have had very good luck with them and s9's