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Home » Scaling Small Energy Harvesters for the Grid

Scaling Small Energy Harvesters for the Grid

March 3, 2011
Raghu Das, CEO, IDTechEx

Energy harvesters for small devices create energy from the environment, such as where there is a temperature gradient, movement, radio frequency field, light and more. For most developers of energy harvesters, wireless sensors is a high priority market, where 90 percent of trials fail to move to adoption because the conventional battery in the wireless sensor makes the system unaffordable - finding and replacing batteries at frequent intervals is a challenge. Negating the conventional battery and replacing it with an energy harvester sees the life time extend to decades. While wireless sensors are commonly discussed, energy harvesting will also - and has already - had prolific use in many consumer electronics applications, from the humble piezoelectric lighter today sold in hundreds of millions to new consumer devices such as cellphones with assisted power from light and heat.

For grid-connected systems, photovoltaics and wind power are commonly used in large energy harvesting farms. However, there are now other forms of energy harvesters developed initially at the micro level which are now being scaled to produce enough energy to replace or supplement grid power. For example, take the humble bicycle dynamo, based on an electrodynamic energy harvester. The same technology is also used in large-scale wind power, but now it has been redesigned to work beyond a rotary means. EnOcean GmbH offers more than 500 products based on this technology from light switches powered by pressing the switch to wirelessly monitored mouse traps powered by the mouse entering the trap. Redesigning decades-old technology is now making other, larger-scale applications possible. Many retailers across Europe are using the technology to power electronic signage on entry to the supermarket: the vehicle drives over a plate which moves and the energy generated by the harvester is captured and used. Energy harvesters can also be applied to stairs: as one walks up the stairs they depress slightly and the energy captured can be used for lighting or other applications, reducing reliance on the grid.

Others are scaling piezoelectric energy harvesters to become an alternative to grid power in some cases. Piezoelectric materials generate power when strained in a particular way. The devices are small but over a large area can amount to significant power generation. In Italy and Israel trials are under way with piezoelectric energy harvesting roads. The vibrations due to vehicle motion are turned into electricity. In a trial by the Israeli government, 2,000 watt-hours of electricity were generated on a 10-meter stretch of road. UK-based Highway Energy Systems are installing a device that monitors the occupancy of parking spaces. An installation will provide about 36 KW in continual traffic. However, these technologies would be best placed where a vehicle is slowing down, otherwise the systems can lower the fuel efficiency of the vehicle. Approaches to crossings, ramps, parking lots, etc., are ideal locations.

In addition, companies such as Pavegen, New Energy Technologies, Powerleap, The Facility and Innowattech are among leading developers, but supporting them with appropriate technologies are many large materials, energy storage and power electronics companies.

Source: IDTechEx

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KEYWORDS Business Strategy Alignment Chemicals & Energy Global Supply Chain Management Pharmaceutical/Biotech RFID & Barcode Supply Chain Analysis & Consulting sustainability Technology
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Raghu Das, CEO, IDTechEx

Scaling Small Energy Harvesters for the Grid

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