edit # 1
http://www.amazon.com/ACUPWR-Travel-Voltage-Transformer-Converter/dp/B00D2YCK7M/ref=sr_1_1?ie=UTF8&qid=1450909003&sr=8-1&keywords=acupwrthe unit above should work for 1 s-7 using a bitmain psu
it is $309.99 and is amazon prime.
made in USA and has Ul approval
edit # 2
this one is too big for a 15 amp
http://www.amazon.com/ACUPWR-AD-2000-Transformer-refrigerator-refrigerators/dp/B008LF60GO/ref=sr_1_3?ie=UTF8&qid=1450909003&sr=8-3&keywords=acupwrI was looking for a better model.
Found this one
http://acupwr.com/collections/step-up-use-220v-appliances-in-110v-countries/products/acupwr-2000-watt-step-up-transformer-use-220-240-volts-appliances-in-north-america-au-2000?variant=10202761987cost = 489.99
ACUPWR’s AU-2000 model is a step up transformer that converts voltage from 110-120 volts to 220-240 volts, thus allowing you to use products that run on 220-240 volts in the USA and Canada.
Made for home, commercial, and industrial use
Converts voltage from 110-120 volts to 220-240 volts
Allows you to use products that run on 220-240 volts in North America
Compatible appliances include laptop computers, phone chargers, LED TVs, window fans, and much more (please refer to our transformer guide)
ACUPWR products are trusted by military, NASA, and government agencies worldwide
Thermal protection with automatic shutdown when overheated (and automatic reset when cooled)
Rated at 2000 watts
CE approved
25 lbs; Dimensions (W x H x D): 5.95” x 4.38” x 7.25”
Type B wall plug, European Schuko Type F input receptacle
Will operate in other countries with proper plug adaptor
Can handle up to 120-percent beyond stated rating (industry standard is 50 percent)
Automatic shutdown when overheated (with automatic reset when cooled)
Lifetime warranty, Up to $10,000 insurance coverage
Proudly Made in USA
Bench tested for quality assurance and years of reliability
This model is rated for up to 2000-watt loads and suitable for home, commercial, and industrial applications. Compatible appliances include central A/Cs, dishwashers, washing machines, x-ray machines, vacuum cleaners and much more (please refer to our transformer guide). It comes with a grounded Type B plug used in most countries in North America and South America and a Type F-compatible Schuko input receptacle that allows for up to 15 amps maximum power.
As with all ACUPWR products, the AU-2000 is proudly manufactured in the USA using the best materials available. This includes copper wiring that allows the unit to operate at home or work under heavy duress, and in the most heavy-duty situations. Unlike less expensive, foreign-made products using aluminum wiring, our products are designed to last for decades. Each unit is hand assembled in our factory and bench-tested at a full-load (the maximum stated wattage) to ensure years of dependability. Among the AU-2000’s features is thermal protection (CTOC); the unit will turn off when overheated.
ACUPWR stands by its products by providing a lifetime warranty and insurance coverage up to $10,000. We count military and government agencies, including NASA’s Goddard Space Flight Center, among our customers for good reason: ACUPWR products are the most best-made, dependable, and long-lasting transformers available.
When considering which model ACUPWR transformer/voltage converter is best for your needs, keep in mind that our products are safe for continuous power at 120 percent beyond the stated wattage, unlike other products that adhere to an industry standard of 2-3 times higher than the appliance’s stated wattage. So, for example, an appliance rated for 300 watts of consumption would, according to the industry standard, require a 900-watt transformer. With an ACUPWR transformer, you can safely use your 300-watt appliance with a 300-watt transformer/converter; our products, remember, can handle 120-percent beyond their stated wattage handling ability.
ACUPWR recommends that you purchase our Global Surge Protector to protect your appliances from voltage spikes. Additionally, our Global Surge Protector allows you to plug in up to 6 appliances using any plug type, thus ensuring its use anywhere in the world. We also highly recommend our voltage stabilizers/line conditioners, in countries where the line voltage is particularly unstable.
They list approved ones and of course the 2000 watt model is not approved.
You need a 20 amp circuit breaker with 10 gauge wire
But if you gave me this $489.99 priced item asked me to plug in a 1600 watt bitmain psu to operate a s-7 at 4800 gh I would test it.
but it is 489.99 plus shipping not 120 plus 80 = 200.
UL APPROVED VOLTAGE TRANSFORMERS CONVERTERS
UL Certification: What does it mean? Why is it important?
Underwriters Laboratories, better known as UL, has existed since 1894 for the express purpose of “promoting safe living and working environments.” UL provides a diverse range of important services, including the establishment of safety and environmental standards, codes, and requirements.
Manufacturers of quality products typically seek UL approval; it means their goods have been tested to meet UL’s benchmarks, and hence are superior quality. According to UL, the typical American home has an average of 125 products bearing the familiar UL stamp of approval in a visible place. You’ve seen plenty of them, we’re sure.
One place you won’t find the UL stamp is on cheap, Chinese-manufactured voltage converters that are built with inferior components, such as aluminum wire. These products are notorious for catching fire, even exploding, when confronted with wattage and amperage loads they can’t handle.
Currently, a handful of ACUPWR transformer/voltage converters, including many in our AD step down models, have met UL approval while the remainder of our line is presently undergoing compliance testing. Ultimately, having UL approval for all of ACUPWR products further ensures what we already know; you’re getting the safest, best made, most reliable, and most long-lasting voltage converter around…made in the USA, fully inspected, and bench tested at full load before leaving the factory.
ACUPWR UL File number: E479623
Autotransformers, evaluated for compliance with IEC Publication 989, Model(s) AD-1000 CTOC, AD-1500 CTOC, AD-500 CTOC, AD-750 CTOC, ADAN-1000 CTOC, ADAN-1500 CTOC, ADAT-1000 CTOC, ADAT-1500 CTOC, ADB-1000 CTOC, ADB-1500 CTOC,ADB-500 CTOC, ADB-750 CTOC, ADF-1000 CTOC, ADF-1500 CTOC, ADF-500 CTOC, ADF-750 CTOC, ADIC14-1000 CTOC, ADIC14-1500 CTOC, ADICH14-1000 CTOC, ADICH14-1500 CTOC, ADIT-1000 CTOC, ADIT-1500 CTOC, ADOB-1000 CTOC, ADOB-1500 CTOC,ADSW-1000 CTOC, ADSW-1500 CTOC, ADULSAN-1500 CTOC, ADULSAT-1500 CTOC, ADULSB-1500 CTOC, ADULSF-1500 CTOC,ADULSIC14-1500 CTOC, ADULSICH14-1500 CTOC, ADULSIT-1500 CTOC, ADULSOB-1500 CTOC, ADULSS-1500 CTOC, ADULSSW-1500 CTOC
