More Energous news today with the announcement of another FCC approval, this time the "unlimited power" Part 18 approval for their Near-Field, contact only, system. You may remember this from May last year when it was approved under Part 18 at 5.8 GHz for 1 Watt transmitted output, but this time approved at 900 MHz at a staggering new 1 Watt transmitted output. Accounting for conversion efficiencies, that might be enough to charge your phone in 10 to 20 hours! Apparently this is momentous news and so WATT shares leapt 25% in after hours trading, because... well for no reason other than this is a volatile stock that trades on hope and greed, not an actual product or profits.
Why was this approval needed? Well, Energous had been advertising the WattUp family, that what charges with the Near-Field device will also work with their upcoming Mid- and Far-Field systems. Unfortunately, they learned in summer 2017 that the FCC would not allow the Mid-Field system to pass Part 18 at 5.8 GHz, and so they scrambled to change it and go with ~900 MHz, the only other frequency band realistically open to them. It got them the approval, for a pitiful amount of power (30 to 100 mW) at a small distance (0.5 to 0.9 meters) and a safety cutoff below 0.5 meters, but broke the promised compatibility with the contact version - the frequencies were just different.
Now, this new approval allows them to market the compatibility, and it will be quite a campaign, I can just imagine it:
"Charge your phone on a pad in around a day, and then charge at a distance in ten times as long! (Warning, charging only valid at 0.5 to 0.9 meters, safety cutoff closer than 0.5 meters)".
If you want to look at the data for yourself, look here, then search for Energous under the Applicant Name, and look up the product 2ADNG-NF230 at 918 MHz. You can see that transmitted power is limited to 29 dBm (basically, just under 1 Watt), and they likely have some antenna gain to pretend it's closer to 3 Watts EIRP. While there are two antenna to try and ensure the device charges at any angle, only one is active at any time.
Like the Mid-Field system approved at Christmas, the Specific Absorption Rate (SAR, a safety limit) seems to be what stops them, and is around 0.864 W/kg. While the limit is 1.6 W/kg, with safety margins it is hard to go much higher. Basically, this is as much power as they are ever going to put out. Further, unlike the Mid-Field, the CEO cannot pretend that the charge rate can be increased by altering the safety zone - there is none. This is as good as it gets. (Yes, Unlimited Power Part 18 does mean "around 1 Watt max").
For comparison, the Qi standard is around 5 Watts, with a high power version at 15 Watts - Qi is the resonant inductive method you're most likely to have seen, and that Apple has essentially chosen for AirPower. USB cables charge at anywhere from around 5 Watts to 100 Watts (though practically most today are around 10 Watts).
So at less than 1 Watt it's easy to see why Myant dropped Energous from their product. It would likely be ~10x slower than the cheaper, simpler cable they look to be providing instead. As a partner of Energous, Myant would have known this was coming, but still dropped it from the lineup. If "waiting for compatibility with long range charging" was the excuse, then that's gone, as both Near and Mid versions are at ~900 MHz now. Myant could put in the 900 MHz contact charging into their product now, and switch to the at-distance chargers later. If a key partner isn't taking advantage of this feature, IMO that's a major warning flag that something is rotten in the WattUp portfolio.
As with the Mid-Field FCC approval documents, this data shows how impractical the WattUp charging technology is, and how it can't be scaled up from here. This won't stop the Energous fans from claiming another victory, that the stock price boost is a sign of impending greatness, however it's just another well timed news dump of practical insignificance that will goose the stock for a few days. Just one of the occasional bounces you can expect to see on the way down and enabling some to make a profit from the volatility, not the value. I continue to admire Energous for their ability to boost the stock price and keep the game going longer. I wonder when we'll be seeing the next set of insider stock sales...
So is this overnight addition of $100 million to the market cap indicative of great things to come? I'll leave you with this, another reminder of what the Energous CEO said almost 2.5 years ago in the Q3 2015 earnings call:
"Here is a brief summary of the results of the amount of actual power delivered to a device at varying distances with a single WattUp transmitter. Power received at zero to five feet measured 5.55 watts compared to our targeted performance of 4 watts. Power received at five to 10 feet measured 3.74 watts compared to our targeted performance of 2 watts and power received at 10 to 15 feet measured 1.06 watts compared to our targeted performance of 1 watt."
They can barely do 1 Watt when in contact in Q2 2018. Still believing they'll deliver an actual product?
(My regular reminder, I have no financial position in Energous, long or short, or any other wireless power company)