thank you very much ....as the location of my outlets are right by my elec panel I will do both 220v and 120v setups...
(god knows what my Titan will want to pull for voltages...best to be prepared..no specs yet that arrives 'supposedly' august sp30 sept)
did I already mention that last years 'hobby' has kinda sprung 'somewhat" out of control?
good to have goals
again thanks for the help on cooling/btu issues and this power stuff it is greatly appreciated ...hopefully this info
will be available to the next guy who has bitten off more then he can chew...sheesh....
Searing
If you're adding new circuits, I recommend you do only 220-240v circuits for all your miners. A miner will draw slightly less than half as much current from the wall at 230v as it would at 115v. You would need two 20 amp circuits at 115v to run a single SP30 (calculations below), but you'd only need one 20 amp circuit at 230v. The performance of the SP30 will likely be higher on 230v than at 115v. The Titan will also use less than half the wall current at 230v than at 115v, and it will also use about 2% less power, generate about 2% less heat, and possibly perform better as well.
An SP30 is 2750 watts in two plugs, or 1375 watts per plug. Power (watts) equals voltage times current, so 1375W at 115V is (1375/115) = 12 amps per plug, or 24 amps total. This means a absolute minimum of 30 amps after applying the 80% rule, and 40 amps with a margin for comfort. On the other hand, 1375/230 = 6 amps per plug, or 12 amps total. Bare minimum circuit size for this would be 15 amps, so a single 20 amp circuit should run it reliably. I don't know what the Titan's consumption is, but it's likely you could power it on a second 20 amp 230v circuit and be fine.
If your home's service is only 100 amps, you should be careful. You're going to need about 40 amps of circuits (with about 20 amps of loads) for your new miners. Add in 10 amps for A/C, 10 amps for lighting and other devices, 10 amps for a microwave, and 30 amps for an electric stove, and you've got 80 amps of more of current, which is enough to trip a 100 amp breaker. You can probably make it work, but you should be aware that you may have to institute rules of not doing X while Y is on (e.g. no microwaving while the stove is on).
You're paying 15 cents per kWh? Ouch. I hope you don't need to use the AC much, because that will add another 25% to your power consumption. I'm sorry my datacenter isn't up yet. Once it is, we'll be charging around 9.7 to 12.5 cents per kWh to cover everything, including cooling and electrical upgrades. Maybe next time?
