i brought an airbrush compressor with the specification of 110V / 120V @ 1A, so how many watt transformer do i need, 300 or 500? so do i need to step up or down to 220V.
89453
it depends how many watts you need. If your item needs a power less than 300 or 400 Watt the transformer will be enough
89454
You don't need a transformer if your compressor specifications are 120 V and 1 Amp. You can plug it to a wall plug and it should work. But if the AC plug on the wall is 220v and you need to use the down converter to make your compressor work at 120 volts then You need to use the electrical formula which is P = E x I. P is the Power in Watts, E is the voltage of 110 Volts I is the current of 1 Amp. so P is = to 110 Volts to 120 Volts x by 1 Amp which is equal to Approximately 120 Watts. So if you buy a 300 Watts transformer it should be enough. Now you could also use the 500 watts if you are using your compressor for long hours to minimize the overheating of the transformer. You don't need a transformer if your compressor specifications are 120 V and 1 Amp. You can plug it to a wall plug and it should work. But if the AC plug on the wall is 220v and you need to use the down converter to make your compressor work at 120 volts then You need to use the electrical formula which is P = E x I. P is the Power in Watts, E is the voltage of 110 Volts I is the current of 1 Amp. so P is = to 110 Volts to 120 Volts x by 1 Amp which is equal to Approximately 120 Watts. So if you buy a 300 Watts transformer it should be enough. Now you could also use the 500 watts if you are... » Read More You don't need a transformer if your compressor specifications are 120 V and 1 Amp. You can plug it to a wall plug and it should work. But if the AC plug on the wall is 220v and you need to use the down converter to make your compressor work at 120 volts then You need to use the electrical formula which is P = E x I. P is the Power in Watts, E is the voltage of 110 Volts I is the current of 1 Amp. so P is = to 110 Volts to 120 Volts x by 1 Amp which is equal to Approximately 120 Watts. So if you buy a 300 Watts transformer it should be enough. Now you could also use the 500 watts if you are using your compressor for long hours to minimize the overheating of the transformer. « Show Less
89455
Wattage is determined by how much powerful your gadget is. Just like Logan said. You need to see how much wattage is written on the device. I purchased a 500 watt transformer for a hot plate that I have which takes 400 watts. It works wonderful. Go with a higher watt transformer so that you can easily use it with any other future devices that go up to 500 watts.
89456
Power = Volts x Amps... So 300 is more than enough. Personally I bought the 500 Watt version because I use it for many things
89457
you have to look on the air compressor. it will be on the underside. The voltage needed has nothing to do with the wattage needed, it just depends on the device.
89458
As others have said, Power = Volts x Amps (so, 120w) but that is a steady state figure and your compressor is likely to pull up to twice that on start-up with no-load until the motor settles down. So, 300w will be safe. However, if you can afford the 500w transformer, go for it.
89459
Usually more is better. Higher wattage won't hurt. As mentioned earlier, to calculate your wattage needs multiply the amps by voltage. If your transformer will provide more than is required you will be in good shape.
89460
The formula to calculate power consumption is simple P = 1A × 110V = 110 V. The 300W transformer is sufficient in this case. I hope this helps.
1082862
You will need a 120v to 220v step "up" transformer if it is from another country and you want to use it in the US, You will need a 220v to 120v step "Down" transformer if it is from the US and you want to use it IN another country. Try the "Goldsource STU-100" "up\down converter $11.99 on amazon
571782
Hi,I'm in France and I use this model with a transformer. I have a 1000W and it works fine, but less is also ok. Since this is 3 amp, then calculate power required as 3 amp * 110V = 330 W. So a 500W transformer is ok.
1761103
Any step_up/step_down transformer can be use to convert 110v to 220v or vice versa except that in this case it is an over kill to use a 3000W transformer for a 750W appliance.
726429
I would think 5 amp * 120 V = 600 Watts. At 80% efficiency this would output 480 Watts. 480 watss / 12v = 40 AMPS. So maximum draw would be 40 Amps on the DC side. The compressor should have a built-in fuse rated 12 amps. If the 5 AMP is on the output side then maximum 60 Watts output. I don't think this is enough for a compressor.BTW does anyone know if the 5AMP is in on the input or output side ?
1703408
I thought about laying down some Ohm's Law, and the (current squared x resistance) heat loss thing, sorry. Lets just say that devising a step-up transformer circuit would be impractical, expensive, and maybe illegal in most jurisdictions. Having a 220/240V - 20 amp receptacle Installed or buying a 110V unit are your only choices.
1266072
All you need is a 100 Watt voltage transformer/ converters used in 100 volt countries (Japan) and 120 volt countries (America). The regular price is about $50. I saw one sold with discounted price $ 17.
1891614
You would need a robust step down transformer to convert 220v to 110-120v. Read the specifications for the Fryer, it may require around 1000W so your transformer must have at least that much if not 2-3x more.
957778
I think you have a problem. The tubes require 700VAC and that is a reality. My complaint is the lack of documentation. Colorful wires yes, instructions no. Be very careful with transformer when energized. There are voltages that are lethal. I have limited engineering skills - check the other posts.
113733
Just my opinion, please read manufactures installation instructions. Since the device says that it is 12 volt and not 120 volt I would assume a step down transformer would be necessary. Please read the current reviews for this device, some where in the back of my mind it was discontinued because of problems. If this is not the one that was discontinued I would suggest a search on U-tube for installation instructions. I have found some great videos instructions on u-tube.
2068037
I installed the the unit and promptly left town so I cannot check the rating on the transformer to confirm, but I would guess 1 amp @ 120v would be a good target. Keep in mind that the current hub is fairly usless without a working internet connection. This is supposed to improve over time.I can say that the hub recovered gracefully after a power outage.
1761744
I'm sure any voltage equipment less than 220V would be ok to use on the transformer....assuming the transformer can be used "up to" 220 volts. Hope this helps.
189284
comes with a plug-in transformer(120v)...think this was your question...good luck.
1708617
The one I have says "input: 100-240v". You should not need a transformer, just an adapter.
799611
The mains transformer (to supply power) is separate from the amp unit. It has two primary windings allowing you to connect for 115V (parallel) for US or 220V (for Europe, for example). You will also need to connect the secondary HV (amp HV) and LV (tube heaters). It's not rocket science but if you have no idea which end of a screwdriver is the business end, you may want to give this amp a miss. (I believe that I left notes on connecting up the transformer on Amazon when I first purchased this baby). Additional connections are input/output - they're pretty obvious.
1497009
I can't understand your question. IF your power is 220v , you need a 200watt power transformer from 115v to 220v. I BOUGHT ONE.
355548
Determine your ref's wattage and multiply by 3 (just to be safe). Thats your ideal transformer wattage.