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Powering small IoT devices spread over a wide area is an important issue, and efficiency is the name of the game.
IoT power- The term “Internet of Things” can be used to describe a huge range of different technologies, from sensors to gateways to back-end systems that organize data and keep machine-to-machine networks secure. Lots of attention is rightly paid to the way IoT systems gather data and how it moves from place to place. However, for some parts of the IoT, the issue of how to keep sensors powered may be just as important.
Particularly in the case of IoT systems that feature small sensors and sensors that might be far away from each other or from the rest of the system, energy usage is a critical concern, because traditional wired power may simply not be an option.
Agriculture, utilities, and transportation are among verticals where widely spaced, low-power deployment is important. Scientists studying a volcano might not be able to run a power cable all the way from the closest part of the grid to their vibration sensors. Soil moisture testers in a farmer’s field could face the same problem, and so on.
There are, however, other options, and choosing the best solution has everything to do with understanding what the desired business outcome and how to attain it with peak efficiency, according to Gartner vice president and analyst Al Velosa.
“The fundamental question is ‘hat’s it cost to deploy the infrastructure?’” he said. “If you’re managing a couple thousand miles’ worth of assets…the bigger cost is sending a truck to that asset than anything else.”
That’s particularly important for the first and probably the most common option for powering small, remote IoT assets – battery cells. No battery lasts forever, so, eventually, they have to be swapped out. The current state of the art focuses on silver oxide cells akin to watch batteries and those used in hearing aids, according to Forrester vice president and principal analyst Frank Gillett,
“One of the problems you run into is that some battery chemistry won’t make it 10 years,” he said.
Silver oxide cells remain popular because their charge-to-weight ratio is comparatively very high. Even a small battery of this type can power a simple sensor outfitted with a low-power, infrequently used radio for years, potentially. They are not, however, so powerful as to free device makers from the responsibility of designing for maximum efficiency.