EE LSDS conference Vienna 2013, http://www.irit.fr/~Georges.Da-Costa/ee-lsds2013/

1. Energy Efficiency in Large Scale
Distributed Systems
Real-World Energy Measurements of a
Wireless Mesh Network
A. Jamakovic, D. Dimitrova, M. Anwander, T. Macicas,
T. Braun, J. Schwanbek, Th. Staub, B. Nyffenegger
Universität Bern, Switzerland
braun@iam.unibe.ch, cds.unibe.ch

2. Overview
> Introduction
— Environmental Monitoring Area
— Wireless Mesh Network Topology at Rhone Valley
— Environmental Monitoring Scenarios
> Solar-Powered Wireless Mesh Nodes
— Solar-Powered Wireless Mesh Node Hardware and Software
— Solar Energy Harvesting
> Energy Harvesting and Consumption Measurement Scenario
> Measurement Results
— Daily/Weekly Battery and Solar Panel Voltage Measurements
— Relationship of Battery and Solar Panel Voltage
— Battery Load and Mesh Node Consumption
— Solar Panel / Mesh Node Voltage and Battery / Mesh Node Current
> Conclusions and Outlook
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3. Environmental Monitoring Area
Sion
Sierre
Tseuzier
storage lake
Plaine Morte glacier
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4. Wireless Mesh Network Topology at
Rhone Valley
Sion
Sierre
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5. Environmental Monitoring Scenarios
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6. Solar-Powered Wireless Mesh Nodes
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7. Wireless Mesh Node Hardware and Software
> IP66 steel enclosure
> 1-2x Alix 3D2 system boards
> 1x Alix 6F2 system board
> 1-4x 801.11n mini PCI cards
> 1x 801.11g mini PCI card
> 1x UMTS mini PCI-Express
card
> I2C twin relay
> 2x2 MIMO, 25dBi,
dual polarization panel
antennas for 5.8 Ghz
> ADAM Linux running
Optimized Link State Routing
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8. Solar Energy Harvesting
> 90 Watt solar panels, voltage: 18.75 V
> Panels supply lead acid battery (78 Ah) and wireless mesh node
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9. Energy Harvesting and Consumption
Measurement Scenario
> Energy measurements by
charge controller
— in winter (nodes 3, 7)
— In summer (nodes 7, 8)
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10. Voltage Measurements During a Summer Day
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11. Voltage Measurements During a Winter Day
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12. Voltage Measurements During a Summer Week
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13. Relationship of Battery and
Solar Panel Voltage During Summer
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14. Relationship of Battery and
Solar Panel Voltage During Winter
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15. Battery Load and Mesh Node Consumption
During Summer
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16. Battery Load and Mesh Node Consumption
During Winter
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17. Solar Panel / Mesh Node Voltage and
Battery / Mesh Node Current
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18. Conclusions and Outlook
> Energy harvesting and consumption data in a
real wireless mesh deployment
> Results show good combination of battery and solar panel.
> Energy supply has been sufficient in our challenging
deployment.
> Certain nodes need more energy, data are valuable for solar
panel dimensioning
> Possible control of mesh node based on available energy and
weather prediction ?
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19. Thanks for your Attention
> More information
— cds.unibe.ch and a4-mesh.unibe.ch
— slideshare.net/torstenbraun
— braun@iam.unibe.ch
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