Dewalt 7.2-18.0 Volt One Hour Charger Logo
Douglas Yule Posted on Oct 09, 2008
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I require a step down plug

What wattage should i buy for my DW9116 bought in U S for use in G B

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Steve Allison

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  • Master 5,569 Answers
  • Posted on Oct 09, 2008
Steve Allison
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I'm disappointed that Dewalt does not have the full specs on their website so . . .
Check the specifications on the charger's label; they should read something like 120 VAC or Volts AC and 2.0 (or similar) amperes or just 'A' after a numerical value.
If the label does not give you an amperage value you can use the output value instead and substitute the output voltage at the high end if a range is listed.
To get the adaptor (step-down transformer) wattage, multiply the AC values such as:
120 X 2=240 watts input power.
If these AC values are not available;
Take the high end charge voltage if it is a multirange charger, and multiply those values;
One we own DW9108 (- yours is 7.2 - 18) is spec'd at 9.6 to 18 volts and 2.8 amperes:
2.8 X 18=50.4 watts.
You can see that the values do not correspond but it is a multirange device so the maximum current taken from the AC line can be ~ 2.0 amperes but this is charging a specific pack and the peak input current is only momentary so the maximum output current and voltage are the values one should use as a guide. In other words, the output wattage is closer to the value needed.
Since there are losses in any transformation (mostly heat), the required stepdown transformer must be capable of more than the indicated 50 watts.
A safe factor would be 1.5 X 50 (W) or ~ 75 watts minimum to ensure the charger receives the 120 volts it wants.      
Anything that will step down your (?) 220 volts and is rated at 75 watts or more will do the job even if the Dewalt draws a little more current at your line frequency of 50Hz which it may.

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AC to AC Power Conversion (Foreign Voltage Converters) Purpose of Converter / Explanation of Operation AC-to-AC voltage converters, or travel converters, are designed to convert the voltage used in a foreign country to the voltage required for a particular AC device. These converters are either transformer-based or solid-state, and this affects what type of devices the converter can power. In addition to converting the power, you will often need to also use a plug adapter. Plug adapters are generally either built into the converter, or provided as separate parts. They are also sold separately, for use with multi-voltage devices that are designed to convert the power internally.
Selecting a Converter These are one of the more confusing of the power conversion devices. Because of the range of voltages, plug types and converter designs, many customers find that they need help determining exactly which converter they need. To aid in that process, we have put together a short worksheet to help you determine what type of converter is needed: We recommend that you print out thi sheet when taking a number of different devices to a different country.
First, you should determine the electrical requirements (voltage, frequency, and wattage) for the device(s) you will be taking with you. This information is generally on a label or embossed into the back or bottom of the device. Make a note of the voltage(s), frequency or frequencies, and the wattage indicated for each device.
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  • The frequency will be given in Hz. The standard frequency for US devices is 60 Hz. Devices that are designed to operate using different frequencies will be labeled, such as 50/60 Hz.
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Next, you will need to know the electrical requirements for the country you are going to be visiting.
Next, you will need to compare your equipment requirements to the country's information to determine whether you need a Step-up or Step-down Voltage converter.
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Once you know what type of converter or adapter you need, consult our list of travel power conversion products to find one that meets your requirements.
Cautions
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  • Do not use a voltage converter with electronic devices such as televisions, VCR's and computers unless the device indicates that it can handle both 50 Hz and 60 Hz.
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  • Do not use non-heating electronic devices, such as calculators, electric razors and portable audio players, on solid-state voltage converter.
  • Do not use 110-120 VAC Surge protectors or Uninterruptible Power supplies on a 220-240 VAC system. Even with a step-down power converter, damage could occur as the two power systems are wired differently.

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Looking for wattage need on chanrger

Usally that information is usually printed on the charger itself. The writing is small on the piece that plugs in the wall. Have you looked there?
Not finding what you are looking for?

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