4 ms·

Right. But (I am an ignorant, sorry), how much wifi power can you get for how long? Thanks.

• tgtweak 8y ago
  This could potentially power a low power beacon every so often. It doesn't seem practical for IOT wearables or for anything industrial at that power density. I'd be curious about the cost, in particular what manufacturing process size can be used for this. 1cm² of wafer can still be quite pricey at .000012 watts. 5°C Delta T generation is pretty impressive though. There are some commercial systems that can operate with 60°C temperature Delta (organic rankine cycle) and recover about 12% of that energy.
  • namibj 8y ago
    They'd need to adapt to something like aluminium foil or UHMWPE film (made like paper from the fiber-spinning solution) as a base and coat that with poly-Si. Even if it is only half as efficient, it should be a lot cheaper and possibly strong enough to be laminated into fabric like e.g. Gore-Tex membranes (extruded microporous PTFE film). A reverse electric blanket would be fancy...
• gus_massa 8y ago
  The total power of the signal of a wifi router is around 2W. (Should I multiply it by x2 or x3 to power the internal system, the blinking leds, heat loss, ...?) For 2W you need ~20m² (~200sqft). That is the size of two rooms. Probably using the surface of your whole roof you can get 4W or 5W.
  • lostlogin 8y ago
    Yes, but that’s for a 5°C difference. It isn’t clear if that changes with larger differences.
  • pfortuny 8y ago
    Thanks a lot. No IoT with this yet, then...
    • birdman3131 8y ago
      https://www.thingsquare.com/blog/articles/sensortag-power/ https://www.thingsquare.com/blog/articles/sensortag-power/ You would be suprised what you can pull off with wireless sensors. These people pulled off 1 year with a 2032 battery.
• pjc50 8y ago
  By the sounds of it this is intended for use with things like Zigbee or LoRAWAN.