Since 2003, Powercast’s mission has been to try and eliminate not just charging cables, but batteries as well. The idea is that in the future, power could be coming from everywhere around you. Therefore, you wouldn’t even need batteries, or at least not very large ones.
Powercast has built two transmitters, the original one called the “Powercaster,” which the FCC approved in 2010, and the newer “PowerSpot.” The company targeted commercial and industrial applications with the Powercaster, presumably because of its larger size, while the more compact PowerSpot will target consumers.
Powercast has also built a receiver chip that can be embedded into devices, called the “Powerharvester,” due to the way it “harvests” the RF energy transmitted by the Powercaster or the PowerSpot.
The PowerSpot transmits 3W of Effective Isotropic Radiated Power (EIRP) to the Powerharvester receiver over the unlicensed 915MHz band. It comes with an integrated 6dBi, directional antenna (70-degree beam pattern), a 5V DC power jack, and requires no configuration. The device is small enough (185.4 x 53.3 x 35.6 mm) that it can be put on a desk or nightstand.
Like WattUp and Cota, the PowerSpot can deliver several Watts of power up to a few feet distance between the transmitter and the receiver. However, the amount of power they can deliver is directly tied to their ranges.
Powercast said that power-hungry devices such as game controllers, smart watches, fitness bands, hearing aids, ear buds, or headphones charge best up to two feet away. Keyboards and mice can be charged up to six feet away. The PowerSpot can charge TV remotes and smart cards up to 10 feet away.
Where things get interesting with the Powercast technology is that it can work up to 80 feet away, but as you can expect you will get much less power at that range. However, the technology could still be used to power small sensors, such as temperature sensors or window-breakage sensors.
The company said that up to 30 devices can be charged at once by a single PowerSpot. However, the up to 3W of power will have to be shared among them, which doesn’t leave too much power for each individual device, even at close ranges. Not many users will want or even have 30 Powerharvester-enabled devices to charge anytime soon, and by the time they do presumably the technology will improve, too.
Powercast will demo its PowerSpot transmitter at CES early next year. One PowerSpot transmitter is expected to cost $100 and ship in Q3 2018. Once it reaches mass production the price could drop to half and sell at $50, the company said.