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Questions tagged [energy-harvesting]

Energy harvesting devices generate power from an external source. While they may include solar, kinetic and other energy sources that are also used on a large scale the term is normally reserved for small low-power applications. An example is a wristwatch that uses kinetic energy while the wearer is walking to power the watch.

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15
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6answers
3k views

RF Energy Harvesting

Why can energy invested in RF radiation not be harvested fully? What are the main factors that affect this? Is there any significant research nowadays that fully describes this process? I stand on the ...
29
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5answers
9k views

Stealing energy from radio towers or power lines

From this answer: How much energy can be harvested from nearby radio towers or power lines? What circuits would you use? How much would you have to absorb for it to be noticeable by the producers or ...
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2answers
3k views

Which of the following motors best suit as a wind generator? [closed]

I'm watching some brushless outrunners with low kv as a generator for a simple wind turbine that I'm going to build soon. It might not be a scale or fully useful turbine, because I want to build it ...
19
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5answers
16k views

Lowest voltage drop diode possible

I am harvesting energy from an NFC device using a tuned antenna on my PCB. Though this method I am able to generate about 3.05V. I would like to charge a super capacitor using the power harvested from ...
-2
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2answers
295 views

Amplifying 10-30mV into at least 5V

My thesis title is "Powerbank with sound to eletrical energy converter" meaning I'll be using sound to charge the powerbank, and I decide to used dynamic microphone instead of condenser microphone ...
9
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6answers
4k views

LED as power generator

As many of you probably know, a normal light emitting diode, while very handy as a cheap and ubiquitous indicator, can double as a power generator. The mechanism is the same that is exploited in ...
2
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3answers
468 views

Piezoelectric vibration energy harvesting

Recently I'm working on a project aiming to convert the vibration of sound waves into electricity to charge batteries using a piezoelectric material (MFC type). I was trying to use the human voice as ...
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2answers
659 views

Flash an LED with an extremely low power source

Let's say I have a very low power solar cell, which is producing a couple of uA of current at 100-200 mV for an output power of a few hundred nW. What I would like to know is what is the best (most ...
5
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3answers
2k views

Harvesting energy from old batteries?

Old batteries (I mean AA, AAA -sized 1.5v ones) usually have some residual energy, which can be used, for example, to charge mobile phones/pads. I have seen some schematics on the Net, but all of them ...
3
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1answer
4k views

What is the maximum power transmitted through NFC that can be harvested?

What is the maximum power an NFC-enabled card can draw from a contactless payment terminal? What are the determinants (i.e. card reader voltage)? What techniques are available for harvesting this ...
2
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1answer
2k views

Difference between indoor and outdoor PV panels

I am building an energy harvesting sensor for building installation, and I have to choose between two panels: Indoor, 5V, 47uA Isc @ 200 Lx Outdoor, 6V, 15.9mA Isc @ 50 kLx (note the different light ...
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1answer
1k views

Do you have to put a voltage across a PV cell for it to work?

I'm studying about PV cells and I'm slightly confused. Currently, I'm learning this very simple model. I'm trying to figure out how exactly it works. Am I correct in saying that; You apply a voltage ...