Drill amps

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How many amps does a 18v cordless drill draw? [closed]

how many amps does an 18v cordless drill draw

Current drawn by a brushed DC motor depends on torque and rpm.

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Maximum current and maximum torque occur at 0 rpm, when the motor is stalled. Stall current depends only on motor resistance, which you can measure with a multimeter on ohm-meter mode. Measure the resistance of your motor, and you will know its maximum stall current.

Most likely this stall current will be very high, maybe like 30-50 Amps. It will be alright for a battery, but it will be trouble for a mains-powered power supply.

If the power supply cannot deliver this current, then the drill will not work well, it will stall instead of powering through the job.

Besides, boost converters suck at high currents. A 12V to 18V converter for 50A current would be an interesting design. Probably multiphase. Please do not believe the ebay specs. I've talked with a guy who bought some Chinese boost cnverters on ebay, and of course the capacitors on them exploded when he tried to use them at rated power. So, when you say:

A boost converter cost about 6$ and the power supply 25$

The converter will cost $6 and it will explode. Resistive losses are proportional to I^2 which means 50 Amps is 100x more trouble than 5 Amps.

Your problem is that a power supply which can deliver this kind of current without blowing up costs more than a brand new drill with brand new battery.

You can rebuild your power tool battery with new cells, or you can buy a new power tool. These are the only options that make sense.

answered Oct 18 '18 at 23:02


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I recently brought home a shiny new 20v Dewalt drill and I couldn’t have been more excited to test it out. Needless to say, it was time to finally complete that home improvement project — only, the drill’s battery didn’t last long enough on a single charge.

This left me wondering about how many amps a cordless drill uses. Because if I could figure out how many amps my drill uses, I could figure out how long it’ll last on a charge.

The simple calculation for how many amps a cordless drill uses is Watts divided by Volts.

But in this post, I’m going to break down what each of these measurements means (in simple terms) and how to figure out how many amps your drill uses.

By the time you’re done reading this post, you’ll know exactly how long your drill will last on a charge. Here’s a hint: It all has to do with the Amp Hour rating of your battery, and that means nothing unless you know the drill’s amperage draw.

Okay, let’s get to it!

What are Amps?

There are a few terms that might be confusing when you’re trying to figure out which cordless drill to buy or how long your drill will last on a charge.

Amperes (or amps) are a unit of measure, and they measure electrical current.

I can almost hear your next question. “Okay, so then what are volts?”

And this is a natural next question because the voltage is clearly an important measurement used in cordless drills. You’re probably looking to buy either an 18v or 20v cordless drill, so which is better?

So, what’s the difference between amperes and volts?

Here’s the simple answer: Although both measure electrical current, amperes measure the speed of the current while volts measure the force.

Imagine water running through a pipe. Voltage would be similar to measuring the water pressure while amperage is more like measuring the flow rate of the water (the speed in which it’s flowing).

And now for the last measurement, you’ll need to know in order to figure out your drill’s amperage draw: Watts. Watts is simply a measure of electrical power.

Now, for that weird measurement on your drill’s battery.

What Are Ampere Hours?

Ampere hours (Ah) are a measure of the battery’s energy storage. A fully-charged battery will usually run for as long as the ampere-hour rating of the battery.

For example, a 3Ah battery will run 3 amps for one hour. If your cordless drill runs two amps, that same battery will last half as long on a charge.

You should find the Ah rating on the battery itself. And if you’re shopping for new drills, it should be listed in the product description or on the box.

How Many Amps Does A Cordless Drill Draw?

Now, to figure out how many amps your cordless drill uses, let’s go back to the pipe analogy.

The more pressure (volts) the water is under, the faster it will go (amps).

So, a 20v cordless drill will always draw more amps than an 18v cordless drill. You’ll also need a battery that’s rated for the voltage of your drill.

And since the amperage will vary based on the wattage of the drill’s motor and the voltage of the drill’s battery, you’ll need to perform a simple calculation to determine the amperage draw for your drill.

How to Calculate Amperage Draw

Check to see the wattage that the drill’s motor is rated for.

Divide the watts of your cordless drill’s motor by the total number of volts on the battery. This will give you the amperage draw of the drill.

For example, an 18v cordless drill with a 250-watt motor will draw about 14 amps.

Now, let’s say your battery is rated 3Ah.

Remember that a 3Ah battery will draw1 amp for 3 hours. So, if you’re running 6 amps, you can expect to have to recharge after about 30 minutes. See the table below to check how the current draw affects run time.

So, now that you know how to figure out how many amps your cordless drill uses, you can find this information for virtually any drill. It may help you figure out what type of battery to buy or even whether you want an 18v cordless drill or a 20v drill.

It’s all about what’s important to you. If it’s important for your drill to last longer on a charge, you’ll want to choose a lower voltage and a higher Amp Hour rating.

If it’s more important for your drill to be powerful, choose a higher voltage and higher Amp Hour rating.

If you are interested in this topic you can check out the following article I wrote: Are Cordless Drill Batteries Interchangeable

Jack Adams

Hi there! My name is Jack and I write for ToolsOwner. I have a passion for everything related to tools and DIY projects around the house. You often find me in my workshop working on new projects.

Sours: https://toolsowner.com/cordless-drill-amps
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Most home users will be happy with a drill in the 12-16 volt range. As a warning, the higher the voltage of the drill, the heavier it will be. Corded drill power is measured in amps, with power increasing as the amperage rises. An 8-amp corded drill is great for home use.

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Beside this, how many amps does a drill use?

Drills, depending on size draw 4-8 amps. Those are max amps, like long rips, or drilling steel or hard woods.

Beside above, how many amps does a 12v drill draw? 20 amps

Similarly one may ask, what does AMP mean for drill?

An amp rating represents the power of a corded drill. A steady power supply means greater run time and no need to stop to recharge a battery, but the cord does restrict mobility. Depending on how far your work area is from a power outlet, a corded drill may need an extension cord.

Will an 18v drill run on 12v?

If you have an 18 volt firestorm drill with dead batteries. You can run that drill off a 12v free lead acid battery that runs cable boxes. It's great to be able to use that useless drill again.

Sours: https://findanyanswer.com/how-many-amps-should-a-drill-have

National Lumber Co.

Power Source

When shopping for a drill, always consider which power source is better for you. There are two options – corded and cordless – both have strong and weak sides. Most drill/drivers, screw guns and impact drivers are cordless. Hammer drills are mostly corded. Other types of drills can be both of them. Cordless drills have gained popularity during the last few years due to improvement in durability of their batteries.

Corded Drills
Corded drills are arguably more durable and have more strength than their cordless counterparts. Besides, you can use it for as long as you want without worrying about the batteries. The downside is that you have to work somewhere near a power outlet.

The main feature of corded drills is amperage or amp. An amp rating tells you about the current load a motor of a drill can carry. Other important indicators include wattage and voltage. Wattage is calculated by multiplying voltage by the amps. Most drills in the US have a voltage input of 120 volts, so you can only choose the amps of your drills. The higher the amps, the higher the voltage. Most drills have amperage between 5 and 10 amps, which equals 600 and 1200 watts respectively.

Cordless Drills
Modern cordless drills have enough power to perform the vast variety of jobs, although their force is limited by the battery. How much power it can deliver depends on three characteristics: torque, voltage and capacity.  Voltage and capacity are linked to batteries.

The battery produces voltage. The higher the voltage, the more jobs you can do with the drill. For small projects like screwing, cordless 10.8 volt drills are enough. A bit heavier jobs such as wood and soft stone require 14.4 volts. Most hobbyists will find 14.4 volts more than enough for all their projects.

The capacity of the batteries is measured in ampere per hour or Ah. For example, a 2 Ah battery can supply a current of 2 amps for one hour. Thus, the voltage indicates the strength of the drill, while Ah indicates the lifetime of one battery.

Needless to say, the battery is one of the most important features of a cordless drill. When buying one, you have to choose between nickel-metal hydride, nickel-cadmium or lithium-ion. Nickel-cadmium are the cheapest batteries that are widely used. They can work just fine in any cordless drill. However, the memory effect is huge. It means you have to empty the battery before you can recharge it. If you try to recharge it when it’s not completely empty, it will remember the status of charging and will lose some of its capacity.

Nickel-metal is a better version of the previous type. It has a better performance that doesn’t have the memory effect. You can recharge these batteries when you want without damaging its capacity. However, we don’t recommend having deep discharges. Don’t completely empty the battery because you will decrease its lifespan. It is not popular anymore because there are better lithium-ion batteries.

The lithium-ion batteries are the best on the market. They don’t have any disadvantages of previous types. They have the best capacity, too. They are lighter and smaller, which is more convenient when you perform complicated projects. The only disadvantage is their price.

The speed is measured in RPM or revolutions per minute, which indicates how fast the tool turns. Modern drills allow you to switch the speeds. Cheaper models have two speed settings, with the minimum speed of 300 RPM and maximum speed of 2,000 RPM.

When you can change the speed, you can perform a wider variety of tasks. However, a higher speed is not always better. For example, harder materials should be drilled at lower speeds. Besides, different materials need different speeds. For instance, if you are going to drill through aluminum, you should get a drill that can reach 2,000 RPM.

Drill Bits
There are so many projects other than drilling that you can use your drill for. Drill bits are special attachments that you can add to your drill to increase its versatility. There are different bits that are suitable for different projects. The most popular are twist, spade and lip bits.

Modern drills have two gears: the lower speed gear for screwdriwing and higher speed gear for rotary drilling. Older or cheaper options have only one gear, which mean you wouldn’t be able to either screwdrive or drill. And if you do, you will get over-tightening or screw damage.

Different torque settings mean that you can choose the level of twisting force. Use higher torque for large screws and lower torque for other operation.  If you get the torque right, the clutch will disengage the drill motor to prevent damaging the screw. The torque settings depend on how hard the surface you’re working on is.

  • Cost Considerations

  • Drills can cost anywhere between $50 and $500. However, quality drill will serve you a lifetime and it may be false economy to buy the cheapest option. On the other hand, you don’t need advanced drills with multiple functions if you only do simply DIYs. Thus, always choose a drill that can fit your needs.

    Sours: https://nationallumber.myeshowroom.com/guide/Drills

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