I was wondering how many watts the chainsaw would run off if it runs on 120 amps. i would like to use it out in the field but need to have the right amps.

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I think you mean 120 volts.

Use a heavy guage extension cord and plug it into a GFCI if you have one outside your house. If no GFCI installed on house, buy a portable one at a hardware store.

The amp draw is on the nameplate on the saw. If it reads 10 amps, for example, you'll need a 16 guage extension cord. If it pulls more than 10 amps, you should use a 14 guage extension cord.

Charlie

Posted on Mar 25, 2011

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
goodluck!

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May 30, 2014 | Generac Electrical Supplies

Tip

What size of inverter do I need?

The correct size of inverter is an easy calculation and important to ensure long life from the inverter and the life of the appliances getting there power from the inverter. To calculate you take the volts and multiply by the amps which equals the wattage. Every appliance has a tag which must state the volts and amps. Locate the tag to find the information. Here is an example.

Under Counter Refrigerator 1.3 amps (120 volts x 1.3 amps = 156 watts)
Microwave (120 volts x 10 amps = 1200 watts)
Alarm Clock Radio (120 volts x .03 amps = 3.6watts)
TV (120 volts x .6 amps = 72 watts)

You now add all the watts together, since the above list could likely be running at the same time. There is a combine wattage of 1431.6 watts. In this example you would need at least a 1500 watt inverter. However given some unknown variables personally I would get a 2500 watt inverter. Less stress on the inverter, will lengthen the life of the inverter. Had the total been 1,000 watts a 1,500 watt inverter would suffice.

You must also remember that your alternator on your vehicle must be able to keep up with the power demand of not only your vehicle needs but your inverter needs as well.

on Apr 23, 2010 | Electronics - Others

How can you get the amp size for a product when they dont list it for example I have a heater it runs on a 120 v and goes to 1000 to 1500 watts so how do I get the amp size?

One watt is the rate at which work is done when one amp of current flows through one volt of electric potential difference. Thus, to find the amps, divide the watts by the volts. In your example, 1500 watts divided by 120 volts gives 12.5 amps.

Sep 07, 2013 | Office Equipment & Supplies

I'm in Europe where the voltage is 220 instead of 110-120. I need a transformer to use the fan but was wondering what wattage is required.

Hi elinorkim...
To find out what wattage transformer to use you must do a little math.
Multiply Amps times Volts = Watts...this is the least amount of watts you want to use, the more the better...higher wattage will make the transformer run cooler and last longer.
Look on the side of your fan for a tag that has this information on it.
Please take time to rate me

Sep 04, 2011 | Holmes Products /FANS HT38R-U Tower...

How many watts required to run this saw?

15 amps x 120 volts = 1,800 watts. is what the book says. But although your saw will pull almost the full 15 amps on start up it drops drastically once running.

Sep 01, 2011 | Dewalt 12" Beveling Sliding Compound Miter...

Just paid over 1,500 last year an has not rungood since. starts up real good, but once aair is turned on it stops running, or it might run one air at times. on my way back to michigan an not a happy...

This generator is a 5KW model. This means it can supply up to 5000 watts of power, total. Not all devices list the watts they need to be provided - instead these devices list the power they need as volts and amps. This can make it hard to determine what the actual watt requirements are for the device.

Overly simplified, watts is equal volts times amps (watts = volts x amps). A single 120 volt light bulb that uses .833 amps consumes 100 watts. If you checked a regular 100 watt light bulb with an ammeter, you'd find it does indeed draw .833 amps.

Working the formula a different way, we can learn how many amps this 5000 watt generator can supply at 120 volts, too. If all the loads you need to connect to this generator are 120 volt types, that means the total amount of amps the generator can supply is 5000 watts / 120 volts = 41 amps purely resistive loads (like a toaster or light bulb) maximum under ideal conditions. There is never a time when ideal actually happens, and not all loads are purely resistive - many are inductive. Inductive loads are motors (like your A/C), fluorescent lamps, computer power supplies, etc. - so figure more like around 30 amps total instead.

If you try to connect devices that require more than 30 - 35 amps, the generator will probably have problems trying to supply this load for any longer that a short length of time. Additionally, motors like those in A/C compressors draw significantly more power when first starting and can cause the problem you are describing. Try running the generator with loads other then the A/C to see how well it can supply the load(s). Or try running only 1 A/C unit and other non-A/C loads.

What I'm trying to tell you is that you may need to do some active load management to be sure that you aren't trying to get more power out of the generator than it is capable of supplying. You may need additional generators or swap this one to a larger size to handle the load properly and safely.

I hope this helps & good luck!

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I have a trailer house that has a 100 amp breaker box in it. I has gas for heat, water heater and stove. I am changing them to electric. Will I need to change the panel put to a 200 amp.

Its probably not a bad idea. Thats alot for a 100A panel to handle, a range needs a 50A, a water heater needs 30A, and the heat will need a 50A or a 60A breaker... Plus whatever else is in the house will be a bit more than the 100A service can handle. But if you don't have the money it will do for a while because for the most part they won't all be pulling at the same time. Word to the wise get at least a 30 space panel when you upgrade, I always install a 40 space panel because for the cost difference its well worth it for future needs because you'll fill it up quicker than you think and you'll have space for anything else you may want to add later on. Hope I helped

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Wattage for Kirby Sentria G10D

The conversion of Amps to Watts is governed by the equation
Watts = Amps x Volts

For example 1 amp @ 110 volts = 110 watts
your case 7 amp @ 120 volts = 840 watts
unless you are running it at 230v but I don't think you can
I would look for one rated for Volt-Amps instead of watts
It's best to round up to be safe add 40 - 60 watts

Don

Apr 25, 2009 | Kirby Ultimate G Bagged Upright Vacuum

Maytag model MDE7057AYW 5600 Watts dryer runs ,but

5600 watts will not operate off 120 volts.
This is a 220/240 volt hookup.
There are 2 legs of 120 volts each that operate the dryer.
The only part requiring 220v is the heater.
Otherwise 120v routes through the various controls and relays.

Mar 12, 2009 | Maytag Dryers

Conecting to 120 volts AC

If you want to get more precise, figure out everything in terms of power (watts).

Basic electrical rule 1, 2 and 3:

voltage x current = power

or re-arranged:

current = power divided by voltage

or re-arranged:

voltage = power divided by current

For example, 12V X 2 amps = 24 watts.

or another example, 400 watts divided by 120 Volts = 3.33 amps

A 55W headlight that uses 12V would draw 55 /12 = 4.6 amps @ 12V

A 55 watt light bulb in a lamp at home would draw 55 / 120 = 0.46 amps @ 120V

As the previous post mentioned, inverters are not perfect when convertering 12V into 120V. If the converter consumes 1000W from the 12V battery, then a 90% effecient converter would generate 900W of 120V AC power best case. The other 100W is lost primarily as heat.

The other thing that gets tricky is that these ratings and the formula above are used for resistive loads, like light bulbs or hair dryers. Anything with a motor or transformer is considered an inductive load and can get much more tricky to calculate.

Consequently you need to give your self a safety margin when figuring out how big an inverter you need.

How does work in a practical sense?

Lets say you want an inverter for TV, DVD and Sat. Receiver. Look at the back of TV or in the manual. It should say how many watts it consumes. Lets say it is 400W. The DVD might be 100W and the Sat. receiver 50W - just as an example.

400 + 100 + 50 = 550 Watts. (just as an example)

You might think, well no problem, I'll use a 600 Watt inverter and have 50 watts left over. Depending on your inverter, that 600W might really be 600 x 90% effecient = 540 Watts of AC, less a 20% margin of error for the inductive transformers in the electronic of the TV, DVD and Sat. receiver 540 - 20% = 432 Watts.

Now you can see your 600 Watt inverter isn't big enough to do the job.

If we really need 550 watts of AC, add 10% to make up the effiency loss, then add a safety margin for inductive loads.

550 + 10% = 605 + 20% = 726 Watts.

Sounds more like an 800W inverter fits the job.

What does that mean in terms of wiring the 12V batteries to the inverter?

from the formula above:

current = power divided by voltage

In our example, we have an 800W inverter that runs on 12V

The current would thererfore be:

current = power divided by voltage
current = 800 watts divided by 12V
current = 66 amps.

That is important info because you can not use light gauge wire to carry 66 amps worth of 12V to the inverter nor could you use a 20A fuse to protect your inverter.

Now that's a lot of science for a guy who just wants to run a toaster on an inverter right?

800W / 120V = 6.66 amps

Using garryp's ratio 11:1, 6.66 x 11 = 73 amps.

That is a good ratio with a good safety margin.

This is all just MHO and should not taken as solid technical advise. In other words, don't blame me if you blow yourself up.

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