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STEP DOWN TRANSFORMER 220v/50hz to 110v/60hz Answered

I have some cordless power tools by Craftsman. Goes without saying they are 110v/60hz. Problem is I live in Australia where we have 220v/50hz. I need to purchase a step down transformer for the battery chargers. Could someone please tell me what spec step down I should get. i.e what output it should have. The biggest battery is 19.2v. Thanks for any advice



7 years ago

instead of using a 220v to 110v tranformer to power another 110v to 19.2v tranformer, why didn't you search for a 220v to 19.2v transformer?


8 years ago

i bought a 220 to 110 v stepdown transformer, and the only issue i had, was with my ball mill, because it kept over heating as the motor wasnt spinning as fast, meaning the cooling fan wasnt either.
sometimes it would get warm, other times it would not change in tempurature at all for days.

my advice, is get a stepdown transformer rated at alot more than what you need, because you wont start to have any issues with overheating, less power ect, unless your borderlining the transformers energy rating.
even so,
your using cordless, which obviously uses batteries (or 10M long arcs across the room, but ill asume its batteries), is being charged by probably 21v, at a current equal to the batteries rating no doubt.
this is converted and regulated dc, it should have no effect whatsoever aside from , and this is a maybe, slower charging times by 1/6th .

as for make and model, dont buy dick smith, go on ebay and look at this guys stuff, i bought mine form him, and its significantly cheaper, that dick smith, in actual fact, his 500w stepdown transformer, costs almost the same as dick smiths , or jarcars, 100w stepdown transformer, if i remember correctly, his costs $30-50 less.
heres a link to the seller
heres a link to the transformer i bought
shippings average, so is the transformer. it comes with fuses, which is all you really need.

remember, if in doubt, get more watts!
try and go 100w higher than what your devices may potantially use , just to be sure, and in case you ever get something that may need more power that is form USA


8 years ago

The main effects of 50hz in relation to 60hz is ;
  • A 50hz transformer is heavier then a 60hz transformer of the same VA rating.
  • That is why military aircraft used 400hz in WWII, to weigh less.
  • A 60hz transformer will run hotter on 50hz.
You need to buy a control transformer 220 Volt to 110 Volt ( 2:1 ) that is capable of 1/6 higher current rating then your Craftsman charger uses
in the USA.


8 years ago

You can't change the frequency without a motor/generator set. Luckily, many (not all) 60Hz chargers will work happily on 50Hz. Check the fine print on the charger, or check with Sears -- they may say in the user's manual or on their website.

Some chargers will actually work off 220V as well. Again, worth looking at the fine print on the charger.

If you do need t drop to 110V, and can tolerate 50Hz, the only other question is going to be how much current the charger draws. Once again, look at the fine print on the charger or at the user's manual; it may be given in amps (which you can multiply by volts to get watts, or it may be given as watts (which you can divide by volts to get amps). Then look for a transformer which can handle the step-down while also providing that much current and/or wattage.


Answer 8 years ago

+1 on the charger voltage - I have DeWalt gear I buy in the USA that works in the UK

Also, we have 110V power tools mandated on building sites, so we have cheap big isolating transformers.