Quote from: rathoretx5 on May 20, 2016, 06:37:14 AM

Hello everyone i just bought two antminer s7's. Where i live, i have to pay very less for electricity. But the problem is the electricity uptime is very poor here, i face 5 to 6 power cuts a day with around 40 minute to 1:30 hours. I want to ask what kind of backup power should i use. i am thinking about getting a 3kva inverter. Please suggest me other options.

Most ASICs(the actual chip that does the work) run on less than 1VDC but very very high current.
Most 'miners' operate on 12VDC.
Most power company power is over 100VAC.

A UPS looses over 10% of the power input to charge the batteries.
It looses at least another 10% when making AC from the stored battery power.

A typical Platinum 12VDC power supply looses ~10% making 12VDC from the wall voltage.

If one were to find the 'best' option, it would probably be to power the miner from 12VDC batteries directly during a utility outage.
If you want your backup to survive more than 1-2 outages you could to plan on having DOUBLE capacity available.

Even with the best available option it may not be a good idea.

YMMV