SimranTHG-20,000 Voltage Converter Transformer Step Up and Down Power Converter for 110 Volt / 220 Volt / 240 Volt Conversion (20000 Watts)

Bought it for use in Ghana to step down from 220 to 110 for the entire house and it works fine. Only issue is that as you increase the load on it, the noise of the step-down also increases, as well as the unit becomes really hot.

I wish this thing had an on/off switch. I have a nespresso plugged into it and it seems like it pulls just a bit of power constantly. I wish, like a surge protector, you could kill the juice completely when it wasn't needed and just hit a switch to turn it back on instead of plugging-unplugging all the time. Still, does what it's supposed to. Heavy duty (or at least heavy), and I've had no issues.

This is not my first converter. The product quality looks great. Let see if it’s durable.

I recently purchased three transformers including this 3000W Simran unit. Being an Electrical Engineer I tested all three out before plugging any equipment into them. This Simran transformer was miswired, with the hot and neutral leads reversed on the input, and a poor ground connection. Thus the hot and neutral are also reversed on the output when in pass through. Stepping up from 110 to 220V gives you 220V across the two output lines, but each has 110V to ground, similar to US split phase 220. Even worse, stepping down from 220V to 110V gives you 110V from hot to ground, and 110V from hot to neutral, but neutral has 220V to ground! The ground connection from the input to the output was made through one of the mounting bolts, but isolation washers were used and the case is painted, so there was about 8kohms between the ground pins on the input and output, and the case was essentially floating. I can excuse the mis-wiring as bad quality control, but the grounding is simply a bad design.It was trivial for me to reverse the wiring and kluge a solid ground, and now it seems like a decent transformer for my purposes. However, I would strongly discourage everyone from purchasing this line of Simran transformers due to the poor grounding. Poor quality control seems to be the norm for all manufacturers of cheap transformers on Amazon, so I would not recommend that you buy any other cheap transformer on Amazon if you don't follow what I described above and feel comfortable enough with a multimeter to test the transformer before use.

Worked just fine for my sewing machine digital motor. There were many people suggesting that you order one that is rated at twice the power you will need, but that is just to help with the initial inrush current some devices pull when powered on. Its best to know your device. My motor is rated for 850 watts and does not pull more than that at any point.

Pros: works as advertised, compact, had no problems running my big Kitchenaid stand mixer or Black and Decker waffle iron (both 800 W).Cons: ugly as sin and just as heavy. But this kind of device should be heavy and it should last.

I've only been using it one day in step-up mode (the 5000VA reversible model), but tested it with a 2100W hair dryer, an 1800W espresso machine, and an 1800W ice cream maker. It worked flawlessly on all of them and barely got warm. When you're going to be using a transformer for extended periods with high-power loads, it's important to get one large enough - twice the power of your intended use is by no means too much. It's got a ton of iron and does the job with ease. That's the good news.Most of the negative reviews that I've seen are due to users not understanding how step-up and step-down transformers work and how they should be used. It's not really as simple as just plugging stuff in. There are several areas that may prove difficult:1. Depending on your specific use case, grounding may not be present with the supplied adapter.2. Output voltage in step-down use can be dangerous, and could require rewiring the wall socket.3. No way to adjust for high or low input voltages - some situations may just not work.4. Line frequencies aren't converted by this (or any) transformer (not a fault of this transformer).1. Regarding grounding: when using it in step-up mode, the European "Schuko" plug (used in France and Germany, for example) has a ground, but only if plugged into a socket with the proper ground connector. The small adapter supplied is ungrounded two-pin only, and doesn't carry ground to the transformer through the Schuko plug. You'll need a different adapter if you want ground, such as https://www.amazon.com/gp/product/B007KLU07U/. And there's a similar problem on the output side: Schuko plugs don't have a protruding ground pin, so you'll need the same kind of adapter to carry the ground to your appliance. The plugs used in the UK, Italy, China, and many other countries have ground pins that protrude from the plug, and these will all carry ground to the appliance. It would've been a good idea to include at least one of these adapters with the transformer for use in step-up mode instead of the two-pin adapter that was supplied.2. The next point is that this is an "auto transformer": the primary and secondary aren't isolated, they're on the same coil. Without going into the electrical detail, it means that when using it for step-down, depending on how it's connected to your 230VAC mains, the voltages on the pins of the output socket will be either neutral and 115V, or 115V and 230V, and you can't tell which you've got without a measurement device. If you're unlucky enough for it to be configured in the latter combination, your appliance will appear to work fine, but may be dangerous. A defect in the appliance (and many have such defects) could allow 230V to come in contact with the surface, which can easily kill you. When used as a step-up, the situation is similar, except that there are no dangerous configurations: the output pins will be either neutral and 240V, or 120V and 120V-opposite-phase (resulting in 240V across the two pins). These are both safe, because appliances designed for 220-240V can be safely connected either way, since sockets aren't polarized into neutral and hot as they are in North America. To summarize this point: you need to understand how an auto-transformer works in step-down mode and measure the voltages at the output socket with a meter, or you risk electrocution. If you see 230V on either output pin (measured to ground), reverse the direction in which the plug is inserted in the 230V socket, if you can. If you can't, you should have the socket rewired to reverse the connections to the two non-ground pins.3. The next point is that there's no way to handle voltage variations with this transformer. In N.America, current practice considers "nominal" AC to be 120V, but in practice can be anywhere from 110V to 120V (legally as high as 126V). The resulting output voltage can therefore be anywhere from 220V to 240V or even 252V. This may be too high for some appliances: nominal voltage in most of Western Europe is 230V. Many transformers provide a way to adjust for high US input voltage, but this one doesn't.4. Finally, another point to be aware of, which is not a weakness of this particular transformer, is the difference in line frequencies: N.America uses 60Hz, while most of the rest of the world uses 50Hz. This will cause many clocks (on microwave ovens, for example) to run too fast or too slowly. More importantly, it may cause large motors in N.American appliances (washers, dryers, refrigerators, air conditioners, vacuum cleaners, but even some hair dryers) to run too hot, shortening their useful life significantly. Again, this is not a problem of this transformer, but rather of any attempt to run devices on different frequencies.Once you've dealt with the four areas described above, you should find that this transformer does exactly what it should (which converts voltage, but not line frequency). If you didn't understand or don't feel competent to address all of those areas, you should find someone who does understand them to help you to set it up.

For all the American 110 volts appliances like microwave, blender, TV, Freezer etc

This one is the on I saw has the best quality and price.

Tres beau produit

juste receive it to day ,fast shipping ,will try it soon .thanks

I did not buy this transformer based on good reviews of others. I was fully aware of its faults based on previous engineering reviews from another buyer. Straight out of the box I did not power it up, but took it apart to fix it knowing it was not safe to begin with. The transformer itself appears to be made ok, but the assembly is the problem. In my unit, the neutral connection for the auto-transformer had been partially cut at the factory which left only a few strands of wire to carry the full current of the transformer. Had I powered this unit up with its rated power load, they would have overheated and melted causing a possible unsafe condition. Another issue with the transformer is that the grounding is inadequate as mentioned in a previous review by another buyer. If you know what you are doing, these things are trivial to fix, but it shouldn't be that way to begin with. I did not see an issue with incorrect wiring in terms of how the hot and neutral were connected as the previous buyer had noted. If you are planning to purchase this unit, be aware that it is a auto-transformer not a standard isolating transformer. Again this is not an issue provided your load is also wired correctly. To sum up, if you are an average Joe, don't buy this transformer. If you have an electrical background, with a bit of work, the transformer is a good value for what you get.

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