P3 International P4400 Kill A Watt Electricity Usage Monitor

List Price: $52.43

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Product Description

Watts killing you? Electricity bills are rising and your lights and appliances can be draining your wallet. Now you can analyze and reduce costs. Find out what appliances are actually worth keeping plugged in. Simply connect these appliances to the Kill A Watt, and it will assess how efficient they really are. The Large LCD display will count consumption by the Killowatt-hour, same as your local utility. You can calculate your electrical expenses by the day, week, month, even an entire year. Also check the quality of your power by monitoring Voltage, Line Frequency, and Power Factor. Now you ll know if it is time for a new refrigerator or if that old air conditioner is still saving you money. With the amazing Kill A Watt you ll know Watts" killing you. Now do something about it! Operating Voltage - 115 VAC Max Voltage - 125 VAC Max Current - 15 A Max Power - 1875 VA Unit Dimensions - 5 1/8H x 2 3/8 W x 1 5/8 / Weighs 5 ounces

  • Electricity usage monitor connects to appliances and assesses efficiency
  • Large LCD display counts consumption by the kilowatt-hour
  • Calculates electricity expenses by the day, week, month, or year
  • Displays volts, amps, and wattage within 0.2 percent accuracy
  • Compatible with inverters; designed for use with AC 115-volt appliances

Customer Reviews:

  • Validates common sense electrical stewardship
    This is an interesting little gadget that provides some really useful information. It comes packaged in a no-fuss little cardboard box with minimal documentation. You would be best served to look online for explanations of "Power Factor" and the like. That said, the device is not complex, but some documentation would have been nice.

    The unit is quite large, and covers both outlets in a standard twin outlet wall gang. for this reason, I purchased a little mini-extension cord so I could get readings from devices plugged into power strips, or devices behind sofas etc.

    One interesting thing to note is that the device needs to track usage over a week or so to give a good indication of kWh usage. Sure, you get an instantaneous reading of how many watts something uses, but that's misleading. After day one, the reading was 1.9 kWh per day for the fridge. After one week, the average use was only 1.4 kWh per day. In my area, that's around $40 per year for the fridge.

    So with this product you're either going to find out that you're wasting a lot, or that you're not wasting as much as everyone would have you believe. Either way, this product is a good way to validate which category you fall into. My own measurements have found that what matters the most is how long an appliance stays on, not how power-hungry it is. For instance, a kettle boiled twice a day at 1600 watts will consume far, far less in a year than a ceiling fan that is left on 12 hours a day, every day....more info
  • Good product
    This is a pretty cool little gadget. I use it for measuring the current wattage that a device is using, plus it will total up the KwH used, so you can use this number to directly compute how much the device you are measuring will cost you. You can get the $/KwH from your electric bill.
    ...more info
  • Poor physical design
    Plugging the device into a wall outlet takes up both outlets. If they would have simply offset the prongs a half inch closer to the edge you would have been able to use the other outlet.

    The device's watt resolution is 1 so the smallest watt usage it will display is 1 watt. Why does this matter? A PlayStation 3 even when it is "off" uses some energy still. The Kill A Watt fluctuates between 0 and 1 watt on the display to show this energy usage. Most of the time showing 0 watts. If the PS3 is using just under 1 watt, over the course of a year that will come out to 1 watt * 24hrs * 365 days = 8760 watt hours or 8.7 kwh per year. The exact value of course is not known because of the lack of better resolution.

    Otherwise the other features as others have mentioned work well....more info
  • great for energy misers
    I never would have guessed my coffee maker uses 1000 watts when it's brewing! This is great gadgit that helps me be a bit greener....more info
  • Kill-A-Watt meter
    The meter works great for measuring electricity usage. I put it on my upright freezer and refrigerator and found how much it costs to run them. I found it was cheaper to replace my +15 old units with new more efficient ones...more info
  • Great product
    It was sent super fast to me! Works great, although I think it may be a bit inaccurate for very low wattages....more info
  • Kill A Watt Review
    Very usable tool to determine power consumption of any 115-volt plug in appliances, operating on 15-amp circuits. Provides digital display of one circuit characteristic: voltage, amperage, power factor watts, VA, Hertz, or accumulated KWH or Time monitored. Very handy and apparently quite accurate. Sufficiently rugged to withstand normal usage....more info
  • Use Kill-a-Watt to fine-tune your RV solar system
    P3 International P4400 Kill A Watt Electricity Usage MonitorMy husband loves this tool, wishes he'd known about it earlier. Says it works great. He uses it in our bus conversion RV to run the electricity efficiently in the solar panel-battery-inverter system. For TVs, fans, microwave ovens, all those gadgets , this meter will tell you the wattage and amperage used, so you can determine how many solar panels, batteries, and what size inverter you'll need. ...more info
  • good, hard to read
    this is very useful to know where the money goes. For example, my PC turned on 24x7 cost me 12$/month in Michigan. Now I know. The only thing I didn't like is that the display is hard to read because there is no back light. ...more info
  • I need to know
    I would have liked a better instruction booklet, but, it does tell you the usage, which of course, my wife hates because I complain how much engergy we use....more info
  • Upgrade features
    Nice well thought out design. However, it could use a lighted display for viewing because all places don't give visible access. Memory or holding display for a period of time would help upon removing meter from dark areas. A short extension should be included as some recepticles are small and other appliances have to be unplugged to use the meter....more info
  • Awsome Unit till I get my smart meter in 40years.
    Awesome Unit! I finally am getting a grip on my electric consumption. It is nice to know the true price of a homemade cup of coffee. Unit was also helpful when hooked to my generator during a week long power outage. I was able to know exactly what else could come on and what would have to wait.
    I wish the display or plug-in part would turn so I would not have to do a headstand to read it at times....more info
  • Junk
    I bought one from Amazon. It did not work. The instructions were horrible. To Amazons credit they accepted the return hassle free....more info
  • P4400 Kill A Watt Electricity Usage Monitor
    It works as advertised.
    However you need a three pronged outlet to use it....more info
  • Dissapointed in product.
    It implies it will calculate costs per day/month/year, but, in fact, YOU must apply readings against utility rate to figure your costs. Most utilities have so many add-on costs, e.g., fuel surcharges, etc., that it is nearly impossible to really grasp the accurate cost of usage. Also, yet another product made in CHINA, that we could easily make in the USA....more info
  • Fun and informative
    It's fun to find where manufacturers stretch the facts on energy efficiency, and where they are conservative. My Asus EEE B202 computer uses a good bit less than the spec'd power (13W when loafing, 17W when booting, with wireless off) but some CFL bulbs I use take more than I'd guessed. Mostly it gets you thinking about energy efficiency. If it prompts you to put some devices on timers and unplug others, then in the long term, everyone wins.

    You'll want a 3 prong extension cord between the meter and the wall socket, or you'll be kneeling on the floor to use it. And I took some reviews to heart and didn't plug anything into it that I knew drew a lot of power, as the meter can get fried.

    It misses 5 stars for having small buttons with smaller labels....more info
  • 6 month payback
    I purchased this item because I was curious as to just how much of a power savings I get by switching my computer to "sleep" mode. Result: Sleep mode: 26 watts; normal operating mode: 113 watts. At my cost of $0.14 per kwh, the 87 watt savings would amount to $0.29 per day if I did not use the computer at all. Since I normally shut down my computer for the night, based on 8 hours per day off, 4 hours in use, leaving 12 hours in "sleep" mode, the real payback time is just under 6 months. Definitly a worthwhile investment.
    I think this model is perfectly adequate to demonstrate the power savings. The fancier model that does the above calculation directly maybe worthwhile for people that don't have a calculator, but still want to understand the true cost of operation in monetary terms.
    I agree with some previous reviewer's comments that the display is awkward to read, since you have to squat down to floor level to read it, and impossible to read if a piece of furniture is blocking the view. A 3 wire, 4 foot long extension cord rated for 15 amps, (i.e. 6 outlet "Power Strip") available at most hardware and electronic stores, solves that problem. It also solves the problem of blocking the second outlet in a duplex receptacle mentioned by another reviewer.
    Now you have no reason not to buy this right away....more info
  • Handy device
    I purchased this to test the wattage use of our appliances. The instructions that come with it are limited, I would have liked them to be more detailed, especially with us novices dealing with wattage/amperage/etal. But it does exactly what I purchased it for, telling me the watts consumed by whatever is plugged into it. I have not figured out how to program the yearly usage but as long as I can have daily, that is fine with me. ...more info
  • Takes a bit of work!
    And time, to get to understand this product but it does seem to give you an accurate understanding of you energy use. I bought it along with a smart strip....more info
  • Jonathan Davis
    Seems to work, Steady state Values are within 10% of a $1000 meter. No peak/surge measurements....more info
  • Very easy to use
    I can't vouch for the accuracy of this product, but it is VERY easy to use. Just plug it in....more info
  • Know A Watt to Kill A Watt
    Am having a lot of fun since purchasing this tool. Figuring out the "phantom" loads on many of my always plugged in appliances and as a consequence, also figuring out how to save money in the long run.
    Only real "con" is that it's a grounded plug on rather large base which doesn't always lend itself to plugging in to the wall. You can use a short extension cord as a work-a-round, but I would like to see the unit redesigned with it's own built in 16" cord a two prong adapter. ...more info
  • Manual is worthless!!!
    The manual is 7 bullets, less than 1/2 page and one diagram. The disclaimer is longer than the manual!!!!
    I plug it in and it starts blinking and beeping when I turn on the device it's plugged into! Does this mean it has found a problem like a open ground circuit? Does it mean I should be using a different setting? Does it mean the device draws more amps than the unit is designed for? Or does it simply mean its taking a reading? UNFORTUNATELY, BEEPING AND BLINKING ARE NOT ONE OF THE 7 BULLET POINTS SO I'M WAITING TO CALL THEIR NON-800 TECH SUPPORT NUMBER!!!!! (The on-line PDF manual is the same worthless single sheet in digital form)

    The product description states ". . . You can calculate your electrical expenses by the day, week, month, even an entire year. Also check the quality of your power by monitoring Voltage, Line Frequency, and Power Factor. . . . BUT you have to figure this out since the manual does not tell you how to convert its readings to ". . . calculate your electrical expenses by the day, week, month, even an entire year. . ." your on your own for that one. . . like you are for figuring out the quality of your power because it tells you only the button functions but nothing else? It will display frequency in HZ but how far off of 60.00HZ is bad or an indication I might need to call an electrician or the power company? It gives RMS voltage but the manual does not tell you how far above or below your service 115 Volt or 120 volt is bad? etc etc etc.

    Product advertising is pointed towards the home user but the manual is for the professional electrician but even fails them when it fails to indicate what blinking and beeping is all about! ...more info
  • Too complicated for easy use
    Was excited to get this, but it is way too labor intensive for me for ease of use. Wrote to company, since came with no instructions. Have to leave it plugged in to appliance for some longish unexplained time, then check with local electric company bill to see how much it costs per killowatt hour. Maybe for a more obsessive person, definitely not for me....more info
  • Kill a Watt does what it says it will do
    For the homeowner that can do a little math (relating cost to kilowatt hours), this product does all it says it will do quite nicely. It's easy to use and has enough features to do the basics.

    Martin...more info
  • Kill A Watt
    In preparation to purchase an emergency home generator I wanted to assure that I would buy enough emergency power without going overboard. After reviewing several different testers I decided on the Kill A Watt P3. It works flawlessly and as advertised. Cudos to Kill A Watt P3. ...more info
  • P4400 Electricity Usage Meter
    Excellent device for anyone wanting to get a handle on what individual 110V devices are chewing up for power. For a variable load like a refrigerator you need to leave the device plugged in for a day or two so you can read the cummulative kw-hr use. The meter resets itself every time it's unplugged. Very simple....more info
  • Kill A Watt can kill electric bills
    I first read about this product in Consumer Reports magazine and decided to try it and see how my electric bill got its size. This device easily helps you find out the KWH of all sorts of electrical appliances. Plug it into the wall socket and then plug your appliance into the Kill A Watt. It can't measure things like dryers and stoves, but can measure everything else from freezers to rechargable lights. I was shocked to see how much it cost to run a dehumidifer for 24 hrs.
    I recommend this item for anyone who wants to cut electric bills, especically if your rates are about to go up!!!...more info
  • This will save you money!!!!
    A very good device for tracking down the true power drains in your house.

    In my case it was my computers that were drinking up a lot of power in my house.

    We now keep them off when not using and we are saving a lot of money!...more info
  • Great product, a few limitations, but functions as advertised
    This is a great product for measuring the electricity use of various items around the house. As this product does do everything advertised and I do approve of those features, I think its really only worth mentioning its few limitations. The product only functions when plugged into a power source, and the second it is unplugged, it loses its readings. So note that there is no memory. The newer model does have that feature. Due to that limitation in this, you'll be hard-pressed finding use for the device with appliances using inconveniently located wall outlets. Also, it would have been nicer if the measuring unit for Kwh went into the triple decimals instead of just two decimal places. As such, appliances like laptops or smaller electronics will require the device to be left measuring electricity usage for hours at a time.

    Other than that, the product does seem to measure electricity usage accurately (I tested against a 100w light-bulb).

    ...more info
  • great toy to play with
    This is a fun toy to play with. It allows you to see many things such as:
    -VoltAmps (VA)
    -power factor (which is ideally at 1)
    -kilowatts used (in a time period)
    -time used...more info
  • P3 P4400 Kill-a-Watt works fine, no problems
    The P4400 works fine, it does what you expect it would do. It would be nice if it could store in memory for a few seconds the data that it gathers so that you do not need to view its screen while it is plugged in (such as when the outlet is in an awkward location). Also, the black LCD readout is difficult to read in low-light situations (if you use a flashlight, it's fine) -- it would be nice if it had a lit display (not permanently lit, because that could be annoying in certain instances). For the price, I would not trade any of its features for one of these other attributes, and I would not want to pay more for these additional features, so it suits me fine....more info
  • Very valuable tool
    Trying to track down where my electricity was going around the house. I was surprised at what I found. One of my DirecTV Satalite Recivers, in standby, consumed more electricity than a chest freezer (in a 24 hour period). I also discovered that one of my computers consumed 25% of the electricity I use per month! Get one you may be surprised just how un-green you are!...more info
  • Entertaining and Profitable
    Until you actually use this product you cannot imagine how much or how little electricity any one appliance uses. If you know your utility rate you can easily transcribe the energy use into dollars and cents. This information can change your energy use. This meter is extremely easy to use. As others have noted its major failing is the lack of a battery to store its information, even for a short period of time. What this means is you have to read the numbers while it is plugged in to the appliance you are testing... no matter how inconvenient that is. A backlight on the display and a short term battery backup would provide better user interface. Even with that shortcoming, I bought one for a gift and one for myself. My sons have already borrowed mine. May have to buy another one for myself....more info
  • KillaWatt monitor
    This itemm seems to work as designed. With nothing else to calbrate it, I can't tell how accurate it is. I ussed it to compare two refrigerators, and am satisfied with the results. The only daw back is that it does not store any information after being unplugged, so you generally have to have an extention cord to make it practical....more info
  • incredibly cheaply made
    I cannot describe how cheaply this thing is made. Out of the box the "Watt" button didn't work. What's more, the buttons are those squishy kind where you can't tell whether it "took" or not. Regardless, I plugged it into a full-sized refrigerator the first night, because the most important function to me was the kwh reading. 15 hours later it said the frig had consumed .68 kwh! If only! This thing is just plain wrong. Going back today.
    ...more info
  • Handy item
    I received this last night and ran around the house testing things. I thought for sure my entertainment center would be off the charts...46 inch lcd, Wii, Xbox 360, Blu Ray player, 5 disc CD changer, and 200 watt surround sound with a powered subwoofer. Well, all of that only used 15 watts of phantom power, and after an hour came out to .01 kilowatts. Now, when you turned ON the tv, xbox and surround sound and used them, they were around 350-400 watts. I tested the computer room, kitchen, bedroom. Basically most spots used 15-30 watts while powered off, and 200-300 while on. I can't turn off the power to my computer because the UPS will beep, and I can't turn it off in the bedroom because the DVR won't work. On a side note, each of the LCD tvs have power saver options : "Auto", "Low", "Medium" and "High". Auto is useless...it does nothing. Each tier saves about 25-30 watts of power while in-use. My TV might go from 170 watts while on, to 145, to 120, to 90. Basically each setting just dims the tv a bit more. Low is hardly noticable, medium is tolerable, and high is way too dark. I'd also like to say it is nearly impossible to figure out how much $ it is, due to how the electric company bills. Usage fee, distribution fee, fuel fee, service fee, etc, tax, tax, tax. You see a fuel charge of .02 per kilowatt hour, but that will only account for 20% of your total bill. ...more info
  • Just as Expected
    Item works great, Just as expected. We use it for our big rig trucks that use electricity between shifts. To keep track of how much they are using and how much we are being charged. Just plug it into the wall, plug in the item your measuring into the killawatt monitor. In an hour you have your electricity usage. Multiply that by your electrical company's rate and the rest is history. We've had it for a couple of weeks now and we are so happy we bought it. Thanks to Amazon for always providing the best possible price for hard to find items :)...more info
  • Useful
    The Kill a Watt is a lot easier to read if you use some kind of heavy duty extension cord. The orientation of the grounded outlet forced me to read upside down without one. ...more info
  • Ordering P3 International P4400 Kill A Watt
    This was priced fairly and shipped quickly. I am using it on various types of equipment and it really is helpful learning the electrical draws on different items....more info
  • Needs some translation
    It really does what is says it does... but that is pretty limited. I know this is the stripped down model but it really doesn't translate your energy usage and project what it will cost you for the month/year. You get a usage and a timer (to get the kilowatts per hour) and then you do the math throughout to make sense of it. In short... you end up spending a lot of time and math to do a home energy review! I guess I was expecting more, esp. in product documentation with the unit. ...more info
  • P3 International P4400 Kill A Watt Electricity Usage Monitor
    The Kill-A-Watt is a basic monitor to primarily assess A/C current consumption (wattage) of household type appliances. The unit works very well. There are more sophisticated units at a higher price that will do the calculations for you. It was not necessary for my needs. I can handle the basic math. It was interesting to see the changes in consumption that are characteristic of some units. This is a very good tool if you want to monitor the parasitic or active drain from your outlet at a price that was very reasonable. ...more info
  • Pinch every penny.
    I think I was more surprised at how little power some of my devices were using. But thats a good thing I suppose. The only complaint I have is it would have been nice if this monitor had battery backup, because if the power goes off so does your information on it. But for the price its worth checking how much youll save by unplugging stuff. I would love one of these for my whole house to check that my meter is right month to month....more info
  • Excellent product
    Does just what it claims to do, and does it very well. Very large, easy to read display. I just plug something into it, leave it for a few hours/days, and come back for the readings. It can be hard to position in some outlets, spaces, but a short extension cord (like the 12" ones designed to be plugged into power strips) works fine. Invaluable tool for tracking how much juice things drain over time....more info
  • Holy cow, that was EASY!
    This was simple and easy to use.

    All of my lights (most anyway) are CF. AC and laser printer are new, energy star, high efficiency, etc.

    Of the 110v appliances in my house:
    All computers/UPS upstairs = 350 watts combined
    DVR=200 when fan is running high (busy or crashed), and 35 when off and idle.
    52" LCD is 115W on startup and 90W in use, 7w powered off.
    Deep Freeze = 250 running, but 17 idle. It amounted to about 4 KWH per day.
    None of my kitchen appliances leak when not in use.
    Fridge is energy star so I didn't monitor for any duration.
    Laptops are max 90w, normally 42W, and nil when in standby.
    Didn't check the kids PC, but it should be about 30W when not in use.
    Glade plugin is 1W.
    Emergency lighting in garage is zero when charged up.

    All in all, my 2 servers upstairs amount for half of my non-HVAC consumption.

    This was good to see, because I can convert some of the drives upstairs into 2.5" drives and cut power consumption substantially.

    Also, if I power off the LCD screens, that saves a little. Ideally, I'd like to move them to geode or atom processors to drop consumption further.

    But the big big big power consumption is heating and cooling, obviously. Discussing with a friend, extrapolating, I could drop consumption by $100/month if I get radiant barrier installed in my attic (ie, thick aluminum foil).

    This all seems rambly but it's to take you through the process. Honestly, I wouldn't know to focus on this if I hadn't run around with the Kill-A-Watt and assessed power consumption. Suddently, $280 electric bill seems like something maybe I can tackle - decrease computing power load and install radiant barrier, and I should make back the $$ in a year.

    The Kill-A-Watt has more than paid for itself....more info
  • Product as described
    Product as described. Very easy to use. It is interesting to find what appliance/device really uses the power. It allowed me to cut bucks from the monthly bill. I highly recommend it....more info
  • Simple, and works
    Does what it says it does, however it has two design faults that make using it more cumbersome than it needs to:

    1. The plug is backwards such that when you add this to an outlet it covers the 2nd outlet.
    2. The numbers that are calculated are only displayed when the device is plugged in which can make it a pain to read in some applications....more info
  • Knowledge is everything
    I was really surprised how much electricity some items used. A Bunn coffee maker was running $10 mo., a garage refer that was $6 mo. compared to the kitchen one that was $26 mo.. Very helpful in making decisions about our power usage. ...more info
  • Good Product
    This product works well. When I tested it with different size incandescent light bulbs, it was accurate to within 2%, generally on the low side. With other devices it seems to be pretty accurate, but since watts and VA are not the same except with purely resistive devices, it is a little harder to tell without comparison to a meter know to be accurate. In any case, from what I can determine it is no more than 20% off on the low side. The unit is reasonably convenient to use as long as you first attach it to an extension cord. For the price, I do not think that the criticisms of the P4400 seen in some reviews are justified.

    I was able to determine that our older refrigerator (about 15 years old) uses twice as much electricity as a newer energy star rated unit. Thus, we have decided that when our refrigerator needs repair will will replace it as opposed to having it fixed.

    I was also able to determine that the fan we use to move warm air from our solar room into the main house is rather inefficient. As a result, I plan to replace this fan with one that is more efficient. In addition, I learned that the D to A converter for our audio system uses about 50 watts at idle. I now turn it off along with our other audio equipment with a power strip when they not being used.

    If you are trying to determine where you can cut back on your use of electricity with the greatest impact, this device will certainly help you do that. ...more info
  • P4400 is a good deal...
    I looked at 4-6 other power-usage devices, including making my own.
    The P4400 does exactly what I need, and it's delivered price is within a couple bucks of the parts to make my own.
    This is a good deal......more info