Costs Low-costs 16 Performance 7 Cost benefit analysis 6 Cost effectiveness 6 Wireless sensor networks 6 Economic analysis 5 Energy utilization 5 Wi-Fi 5 Wind power 5 Adhesives 4 Commerce 4 Controllers 4 Global warming 4 Renewable energy source 4 Simple++ 4 Solar cells 4 Cyclic voltammetry 3 Design and tests 3 Electric inverters 3 Energy 3 Energy efficiency 3 Energy markets 3 Harmonic analysis 3 High-performance WSN 3 Integrated circuit design 3 Internet of things 3 Investments 3 Irradiance WSN 3 Irradiance network 3