Functionality and Cloud Back-End

We briefly touched upon the functioning of the UFO Power Center in the previous section. An important aspect of such a consumer device is the presentation of the generated data. Towards this, Visible Energy currently provides two ready-to-use solutions. One is the iOS app which provides instant updates and actions while on the local network. The other is the cloud-based service portal where any updates made are fetched by the UFO periodically. I am actually doing a bit of disservice to the unit by not reviewing the iOS app, as I have never been a fan of (nor do I ever plan on being one) Apple’s restrictive ecosystem. That said, the iOS app is actually coded in Javascript/HTML5 using the Phonegap framework. This is also available on Android, and so, it is quite possible that we might see an Android app sometime in the future.

Setting up the UFO Power Center in the absence of an iOS device is a bit of a challenge for the non-tech savvy folks. Visible Energy does provide step-by-step instructions, and the steps we took are presented in the gallery above. In the factory reset state, the UFO Power Center creates a Wi-Fi access point with an SSID of the form VE_UFO_<Serial Number Last 6 Digits>. A PC or laptop connects to this SSID and creates an ad-hoc network. By default, DHCP is disabled, and the UFO Power Center brings itself up with an IP address of

It is important to note that the UFO Power Center doesn’t run a full-blown web server, but generates these basic configuration pages on-the-fly in response to HTTP requests. Clicking the ‘Setup’ button allows the user to enter the SSID, encryption type and key. After a restart, the unit automatically obtains an IP address through DHCP from the router. Cloud-based management can be achieved through an account on the Visible Energy service portal. The registration key obtained by accessing the unit’s IP through a browser can be used to add it to the account registered with Visible Energy.

One of the important aspects to note about the cloud interface is the fact that data is never pulled from the device over the Internet. Rather, the device actively pushes data out to the server every minute and also obtains any pending commands (such as the change in state of a socket / change in socket status schedule / socket name change etc.).

Each device page in the service portal presents an overview of the current power consumption (total and on-device basis), cost to run the device connected to each outlet and how it compares to what it was on the previous day / week, name of each socket and an ON / OFF control for each of them. A one shot timer to alter the socket status can be set up for a future timestamp. In addition, there is some support for basic home automation ‘scenes’ with the roles feature. By default, all the sockets are set up with a neutral role. One of them can be tagged as the ‘master’ socket with a power threshold (low, medium, high or high+ corresponding to 2,5,10 and 35W respectively). Any socket tagged as a ‘slave’ gets turned on when the master socket’s power consumption goes above the configured power threshold. Correspondingly, it gets turned off when the power consumption of the device on the master socket goes below the power threshold. This is useful in scenarios where, say, the AV receiver needs to be turned on only when the television is on. Socket schedules can also be set on a week-by-week basis, i.e, a socket can be configured to turn on only on, say, weekdays between 9 AM and 7 PM.

The cloud interface also allows notifications to be set up, wherein the unit automatically e-mails a pre-defined address when, say, a socket’s power consumption goes above a pre-defined level.


A variant of the Monostrip product which was announced recently allows for temperature and humidity sensors which can also be used for generating notifications. For the UFO Power Center, the power consumption of the socket is the only available parameter.

Detailed power consumption values are presented in a easy-to-use graph with a configurable time range. A CSV file with the power consumption data can also be exported, but the values recorded are at 5-minute intervals (even though the device updates the power data every second internally).


Similar graphs are available for the energy consumption / cost of operation.

The cloud interface is excellent for understanding the energy and power usage of the connected devices at a macro level. However, cloud management of the UFO Power Center is a hassle because each change has to be received by the unit from the server before the next change can be made. In addition, determination / recording of the instantaneous power consumption every second (the frequency at which the UFO Power Center’s internal registers are updated) is simply not possible. These drawbacks are almost fully solved solved by the iOS app, but we will look into another alternative, the open APIs, in the next section.

Hardware and Industrial Design Taking Advantage of the Open APIs


View All Comments

  • DukeN - Friday, October 26, 2012 - link

    How dare these capitalists make a profit after paying for materials, assembly, hardware and software developers! Reply
  • ganeshts - Friday, October 26, 2012 - link

    I don't want to come across as 'defending' the product, but the fact is that this is cheapest solution for the set of functions that it delivers. Have you taken a look at the Watts Up? Pro .NET solution which delivers similar functionality (electrical parameters measurement / network switching / cloud back-end) on one socket for almost double the cost?

    The solution that you put in requires plenty of work to make it 'Internet' enabled, and it is not a generic solution. What about energy history? There are plenty of features and the components needed to achieve those add up.

    Btw, where are you getting a good relay (rated for 15A) for less than $5? When I looked up the Schrack relay being used in the UFO, I found that each of them costs $6 by itself [ ]. 4 relays makes it ~$25 by itself.

    I stand by my concluding remarks: The UFO Power Center presents unbeatable value for the $130 MSRP / ~$115 Amazon selling price.
  • ZETAPIERRE - Friday, October 26, 2012 - link

    There's a big difference between hacking circuits together for a single use and creating a product that meets safety agency and provides ease of use. We too started with just a relay and worked our way up to a nice product.

    The price of this product is quite reasonable. We only have 2 relays, but still have a micro and WiFi. Ours will be around $99 once it goes to market.
  • jgarcows - Friday, October 26, 2012 - link

    "It is possible to set up port forwarding to access the unit via the default HTTP port. However, in the case that this port already forwards to another machine in the local network, the user has no way to access the UFO over the Internet without modifying the HTTP port of the other machine."

    There are many ways to get around this: forward a different port to the UFO, use a sub-domin to choose where which machine to forward the port to, have the machine currently receiving HTTP traffic check the request and forward appropriate requests to the UFO, etc...
  • cserwin - Friday, October 26, 2012 - link

    Wow, the manufacturer really needs to be commended for using 16A switches on all outlets.

    It makes sense that they limited the device to 15A overall - as I understand it that is the limit of common household outlets in the United States. If they permitted higher draws, it would likely trip circuit breakers or fuses.

    A lesser manufacturer would have designated 1 outlet as 'up to 10A' and the rest as 1.25A or some such nonsense.
  • ZETAPIERRE - Friday, October 26, 2012 - link

    Well, one is almost forced to use 16A relays in this application. Since there is no front end fuse, one needs to rely on the circuit breaker. So, that means that the traces on the board and the relay contacts need to survive long enough during a dead short for the circuit breaker to trip.

    My concern is if they plug this into, say a kitchen outlet that is at 20A.

    We do the same, each relay is rated for 16A, but we set the whole unit to 15A because of the one pigtail going to an outlet.
  • danjw - Friday, October 26, 2012 - link

    To solve the issue of the wall warts not seating properly, you can use a power strip saver. Usually these are just about 1' long extension cords. Then the warts can sit in the base and not have a problem. I use them on my power strips to deal with blocked sockets. That said, they really need a smaller design that will fit in better. I am a function first, form second kind of guy, but this still puts me off. Reply
  • Henk Poley - Friday, October 26, 2012 - link

    Seems like a nice match with the DIY Kyoto Wattson :: Reply
  • CharonPDX - Friday, October 26, 2012 - link

    This review has nothing to do with iOS. Did you really feel it necessary to bring up your slam on iOS in it? A simple "I had no iOS devices to test with" would have sufficed. Better would be to have a friend who has an iOS device come over and test it for you, or let you borrow their device to test with.

    I can understand making an iOS comment on an iOS review, or even an Android system review; but not this.
  • Tomislav R - Saturday, October 27, 2012 - link

    +1 Reply

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