3000W ST-Pro Auto Step Up & Step Down Voltage Transformer Converter, Heavy-Duty AC 110/220V Converter with US Standard, Universal, Schuko AC Outlets & DC 5V USB Port by Goldsource [3-Year Warranty]

It's a bit bulkier than I would like but given the wattage it supports, I can deal with the thing sitting on the kitchen floor. I've already used it with all my 220v appliances and they all function normally. I used my Panasonic rice cooker and rice was cooked with no issue in 50min. I used it with the electric kettle and the toaster and both did their jobs as before. I also vacuumed the entire apartment with my Dyson canister without any issue. It was quiet without any unusual noise or humming during usage. It is quite versatile with both step-up and step-down functions but I seriously doubt I would ever need it to step down from 220v to 110v. The separate power input sockets are clearly marked for 110v or 220v. Since this is sold in the US, it only comes with a US plug power cord. For those looking to use it for step-down, you'll have to find a cord with the plug type you need. There are two 110 outlets and two 220 outlets with one being universal (fit my UK type plugs) and one three-prong type (not sure what it is). The strap on top makes it easy if you do need to move it around. For under $120 it's a pretty good deal as it enables me to use my existing appliances, especially the Panasonic and Dyson without having to buy new ones, which will cost me way more than $120.Update Feb 2023: After 3 years of continuous usage with vacuum cleaner, rice cooker, electric kettle, and toaster, it finally started having problems. It starts to emit burning smell while using with the kettle and the vacuum. There is no fume nor the unit is excessively hot. However, on the safe side, it's time for a new one.

I'm in the U.S. I bot the 3000W amazon product so I could use my eu2000i (110V)generator to run my 220V propane forced air heater if power goes out. It is a propane forced air unit with 3/4 hp blower motor and a small combustion fan. It is around 700W total.My heater is a 240V unit....and it is PURE 220. It's only fed by 2 hots and a ground. There's no center tap (neutral wire) for 110v. Only 3 wires go to the heater. If you are trying to run an appliance that has to tap of 110V from neutral and one leg of the 220 (ie 4 wires= 2 hots, 1 neutral and 1 groundlike most US utilities), Then this amazon product would probably NOT work.So this amazon product worked for me.

This put out the power and doesn't get very hot. I haven't hooked it up to a meter to measure it's actual power efficiency yet. I am using it to run a 1600W 240V heater. Normally you want at least double head room when using a power transformer with a heater. I.e. a 1600W heater should have a 3200W transformer. Yet this doesn't even get hot. It is very easy to use, even without an owners manual as all the outlets and ports are clearly marked. Even the 2 fuse ports have the fuse size printed beneath them. I couldn't be happier with this! :-)

I bought a subwoofer (mj acoustics 400-sr) from England. It came wired for UK AC power. Rather than send it back and get one for US AC power, I decided to try a transformer.After much research, I selected the Goldsource ST-1000 Pro. I chose it because it is simple with only an on/off switch to operate it. To use it as a step up transformer simply connect a 110/120 V US AC source to the 100/120v input. The front side provides a universal output and a schuko output. The universal output will accept a US type B plug.The transformer is silent/transparent and in my opinion may offer another level of isolation/protection for the subwoofer.

This is an auto-transformer. As it only has three leads on the transformer, it provides no isolation. If you use it to step up voltage, the output will be 230 volts relative to neutral or ground. Twice the usual.I plan to use this with a generator to power my well pump during power outages so the isolation isn’t an issue.I took the cover off to check the circuit and found a wire soldered improperly to one of the outlets. This was a 12 Ga wire held on by only a couple of strands. I wasn’t planning to use this outlet but it could have broken off and made a dangerous situation.Update. After testing for a few hours, the fuse holder failed. Poor contact to fuse and holder led to bad electronic smell. Had to replace fuse holder. Poor quality, unreliable unit.

I bought it to supply enough power to my Miele washer/Dryer and it works perfectly. I tried with different programs and it is very silent and it doesn't overheat at all.

I recently move to Kuwait and had a few 120v appliances I could not bear to part with so I needed a transformer. After looking at many different brands, I settled on this one as it is both a step up and step down device, which is great incase I buy something I cannot part with when I eventually move back to the US.I have been using the transformer for over a month now and have had no problems. It seems well made and it is rather heavy; some people may have difficulties in picking it up and moving it around.

Though very heavy the item was packaged very well and came in perfect condition (I have had similar items with big dents/breaks in the packaging due to the weight.)So far, I have had no issues with this transformer. I use it mainly for kitchen appliances and prefer not to have any items connected to it 24/7. I just plug it in for use, and disconnect it when done. I believe this also prolongs the life of the unit. Having the USB output is a nice bonus.The handles are useful for moving it around, making it very portable.