Technology Explained

5 Reasons Why You’ll Love “Power Over Wi-Fi” Technology

Jessica Coccimiglio 28-12-2015

Are you sick of having to plug devices into the wall for power, or recharge and replace batteries? It would be nice to power a device without having to remember to do those things, wouldn’t it?


There is a whole new level of freedom for harvesting energy right around the corner. A power source that is becoming more common each day around the world could completely change the way we charge.

What Is Power Over Wi-Fi?

Power Over Wi-Fi (PoWiFi) is an innovative new technology developed by researchers at the University of Washington (UW) that could someday power devices simply by leaving them in a Wi-Fi zone.

With PoWiFi, your wireless router 8 Key Questions You Must Ask When Buying A New Wireless Router Here are eight questions you should ask when buying a new wireless router. Read More would send power packets out to nearby devices in order to charge or power them all the while sending regular data packets to computers for things like emails, cat videos, tech articles, etc.

It works because routers constantly “leak” an as-yet untapped, ambient Wi-Fi signal that could meet the energy requirements of low-power devices.



The UW team’s PoWiFi system consists of a firmware update for routers plus hardware for energy-harvesting sensors.

The routers are optimized to 1) strengthen the Wi-Fi signal to hit the energy requirements of usefulness, and 2) send the power packets on unused Wi-Fi channels. The energy-harvesting sensors take in the power packets and convert them for the device.

5 Reasons Why PoWiFi Is So Exciting


1. Wi-Fi’s ubiquity means power everywhere.

Can you imagine that? We would be able to harness a whole new source of power that already happens to be out there, right now, untapped.

PoWiFi can power devices up to 17-28 feet away from a normal Wi-Fi router. That means you can be charging batteries just by having them in the right room. No need to take up a wall socket or keep them on small rectangular charging pads.

2. The proof of concept exists.

To prove their concept, the UW researchers have already used PoWiFi to power devices like a simple temperature sensor, a grayscale camera with low resolution, and the charger for a Jawbone Up24 wearable fitness tracker.



They also adapted their sensors to trickle charge 2.4V nickel–metal hydride (NiMH) and 3.0V lithium-ion (Li-Ion) coin-cell batteries.

In other words, this isn’t just theoretical hype that’s going to fade once we find out that the theory doesn’t work. PoWiFi actually works. It’s already here.

3. No noticeable impact on Wi-Fi speed.

The UW researchers have already launched the PoWiFi system in six homes in a metropolitan area and measured the impact on the residents’ browsing experiences.


Browsing speeds were hardly slowed down at all with PoWiFi in place, and users typically didn’t notice a difference. With that test, the researchers demonstrated that the system can work in real-world networking situations, and won’t create a nuisance.

4. It could help develop the Internet of Things (IoT).

The Internet of Things What Is the Internet of Things? What is the Internet of Things? Here's everything you need to know about it, why it's so exciting, and some of the risks. Read More is an area of innovation that embeds computing sensors in everyday objects. This gives them network connectivity and the ability to sense things about the world to intelligently change the way they behave depending on proximity and context.

Makers and DIY-ers are constantly working on new ways to smarten up ordinary objects in our lives, but electrical sensors in these projects need power all the time, especially if they are intended to respond to environmental triggers.

If PoWiFi was widespread and these designs didn’t need to be plugged in or a regular battery change (imagine if the object is mounted in a hard-to-reach spot, like a motion-triggered camera might be), it opens up a wide world of things inventors of tomorrow can create.

5. It will make Nikola Tesla’s dream a reality.

Who doesn’t love inventor, electrical engineer, and famed futurist of the late 19th-early 20th century, Nikola Tesla? As the UW researchers mentioned in their paper, Tesla dreamed of eliminating wires for both power and communication.

We’ve got reliable wireless communication around the world, so power must be next. PoWiFi could make it happen. It may even be the winner in the Tesla theory: the race to wireless power The Tesla Theory: Who Will Win The Race For Wireless Power? No dusty cables around the house. That's the promise of wireless power. While the idea seems ridiculous and nearly impossible, you may be surprised to learn that wireless power is fast becoming a reality. Read More .

3 Important Drawbacks to PoWiFi

Lastly, let’s talk a little bit about the downsides.

First, there’s an important relationship in the distance between PoWiFi routers and the objects harvesting energy. As these graphs from the UW’s final research paper (PDF) illustrate, if the object is further away from the router, it takes longer to draw the power to do its work.


In the case of the temperature sensor, if it’s further away from the router, it takes a reading less often. In the case of the camera, if it’s further away from the router, it takes longer to charge up to take a photo. So, in the event that PoWiFi is in our homes, we will still want to keep our devices as close to the power source as possible.

There’s another drawback to this technology: it won’t power your smartphone (as Rhett Allain from WIRED laments). As the researchers point out, the Federal Communications Commission (FCC) limits the ISM bands of the radio frequency spectrum to 1 Watt. Smartphones run at 5 Watts, so they won’t be able to draw enough power from PoWiFi technology.

Finally, it’s unclear when PoWiFi would be commercially viable. Technology like this can last years in testing and development to work out the kinks, refine the product, and make it reliable enough for the general public to use.

Potential Alternatives to PoWiFi

Wire-free charging What You Need to Know About Wireless Charging Until our devices offer week-long battery life, charging on the go will remain a reality for us all. Read More  has been around for a few years. Check out this demonstration of wireless electricity from 2009 by Eric Giler, a wireless electrician and the CEO of WiTricity:

Other companies are exploring other technologies to charge and transmit power wirelessly, too. This year, Energous created a Radio Frequency (RF) device called WattUp that will let your battery-operated devices receive a charge from within a thirty-foot range.

For wireless power you can actually use today, you can buy wireless power banks like the RAVpower wireless power bank RAVPower RP-WCN11 Wireless Power Bank Review and Giveaway The $54.99 RAVPower RP-WCN11 provides a portable means of powering your gadgets — and it includes wireless, inductive charging using the Qi standard. Read More  to charge smartphones and other devices. 

What Would You Power Over Wi-Fi?

If we ever get to see PoWiFi in real life, I think it would change our lives. Slowly at first, then all at once.

What about you: If you could leave a device just lying around near your Wi-Fi router to power or charge it, what would it be? And how big of a disappointment is it that it won’t power a smartphone?

Image Credit: Wi-Fi-powered Surveillance Camera by Dennis Wise via University of Washington, Prototype hardware demonstrating PoWiFi’s potential via University of Washington.

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  1. PV
    January 5, 2016 at 2:19 am

    From an energy point of view, this is no different that turning on the lights in a room to charge your phone with a little photo-voltaic panel. Just as all the light put out by the bulb doesn't fall on your eyeballs neither is the Wi-fi power all focused on the antenna of the device to be charged. And of course somebody has to pay to keep the light on.

  2. monso
    January 4, 2016 at 10:19 am

    Regarding the inability of charging smartphones due to 1 Watt restraint.
    wouldn't be possible to charge a power bank that just laying in the house, that will eventually be used for charging smartphones etc..?

  3. power
    January 4, 2016 at 6:33 am

    Powifi will not be free!! The power companies will see too that!!!!! They will make sure you pay one way or another!!! Nickola Tesla had the only system for generating power from the earth. But the FBI stole all his files, when he died. So the powers that be can have there monopolies for ever!!!!!!!

  4. Anonymous
    January 2, 2016 at 3:41 am

    "Who doesn’t love inventor, electrical engineer, and famed futurist of the late 19th-early 20th century, Nikola Tesla?" Women. Tesla was a well-known misogynist.

  5. Faustin Gashakamba
    December 31, 2015 at 8:47 am

    My view is that this is shying away from improving the battery technology which suck given that we lack any significant breakthrough for decades now and this is unusual in the tech sector.
    Please discover a decent battery technology and all the rest are the details!

  6. RobDiesel
    December 29, 2015 at 1:01 pm

    If I could implant some stim devices, I might get a work-out in by sleeping at home.

    On a more serious note, pacemakers might benefit, just like the hearing aids mentioned above.

    I'd be happy to even trickle charge regular devices like wall clocks and remotes - or not even trickle charge, but extend their run-time by months. A small capacitor getting charged up would be sweet.

    I'm still dreaming of building my own inductive charged in the garage floor to trickle-charge my car when I park it for a few weeks of vacation.

  7. Guy Lilley
    December 29, 2015 at 3:32 am

    keep my hearing aids powered with out the batteries going dead when i can't change.

    • Jessica Coccimiglio
      December 29, 2015 at 4:18 am

      That sounds like a really useful application of this technology. Thanks for sharing, Guy!

  8. Ken R
    December 29, 2015 at 2:49 am

    My DSLR battery would always have a full charge when I grab it no more regular charging of all my Canon batterys to makes sure I have at least 2 full, right now I have to store the batterys out side the camera to avoid a slow residual drain that kills them in about 2 weeks if I don't use it, as for all the radio waves bombarding us! Unless you live in a lead lined underground bunker we are getting it from all angles Satellite, terrestrial radio, hospital diagnostic machines, and yet undisclosed sources our governments have yet to declassify. There is no escape what's another RF signal hitting us going to do? I was just giving a beta router a Linksys EA9500 AC5400 TriBand Maxstream for testing it, its powerful 2 simultaneous 5 ghz signals and a 2.4 all with their own dedicated transmitters! 8 discret antennas now this thing could pop provide some wireless power with unused RF. And no I am not breaking my non disclosure the test is over and it has a FCC file with photos and specs available to the public its just not for sale yet

    • Ken R
      December 29, 2015 at 2:53 am

      Don't mind the typos my Mobile to X auto correct has a mind of its own and the chrome browser doesn't like this site much for some reason guess its not mobile friendly?

      • Ken R
        December 29, 2015 at 2:54 am

        Moto X I give up fighting this site.

    • Jessica Coccimiglio
      December 29, 2015 at 4:28 am

      Nothing like waking up wanting to do some shooting and finding the batteries dead. Maybe someday PoWiFi will make that all a thing of the past. Thanks for commenting, Ken!

      - Jessica C

  9. Greg
    December 29, 2015 at 1:07 am

    GeeWhiz Petew..
    That's harsh....

    • Petew
      December 29, 2015 at 10:59 pm

      Not meant to be harsh, it's just reality, even if you turn off your wifi, your neighbors wifi fields are still penetrating your house, along with all the other crap (TV, Radio, cellular, power lines, satellite systems, etc.) that's penetrating our environment. Unless one wants to live in the boonies, and even then who knows :-)

  10. Steve
    December 29, 2015 at 12:37 am

    Absolute ignorance with regards to the health impact this would have on everybody.. Having everything powered by wireless power?? Yeah sounds ideal if we're all walking around in protective suits!

  11. prophit1970
    December 28, 2015 at 11:33 pm

    Sleep with it by your bedside, get brain cancer.

    • Petew
      December 29, 2015 at 12:34 am

      That's bull, if you have wifi running you're in the zone anyway. So either stop using wifi (and your neighbors as well) or live with it.