We’re rewarding the question askers & reputations are being recalculated! Read more.

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.

Filter by
Sorted by
Tagged with
29
votes
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 ...
19
votes
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 ...
15
votes
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 ...
14
votes
2answers
34k views

Is it possible to use Kinetic energy to power small devices?

I've tried looking around for as much information as I could gather to build really small wearable electronics that could power themselves by generating energy with movement. I know that the ...
9
votes
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 ...
7
votes
3answers
1k views

Solar Powered Trash Compactor (Chicago Big Belly)

I live in Chicago and I walk past these trash cans every day that have a large solar cell on the top of them. These trash cans are supposed to collect energy which runs a trash compactor inside. This ...
7
votes
2answers
223 views

LTC3525 Shutdown feature reacts to wrong thresholds

I've be thankful if somebody can help me with my energy harvesting board problem. I've created an energy harvesting board based on the step-ups Linear Technology LTC3105 and LTC3525-3.3. Below please ...
6
votes
2answers
344 views

Maximum power out of thermoelectric generator?

The conventional method to extract maximum amount of energy from ThermoElectric Generator (TEG) is to load it with a resistance equal to the TEG's internal resistance as the maximum power transfer ...
6
votes
1answer
455 views

Teg energy harvesting by ltc3108

I am currently doing a project regarding thermal energy harvesting using TEC Peltier modules and LTC3108 IC chip. This IC chip requires inductors that act as transformer to step up the voltage input. ...
5
votes
3answers
5k views

How do the cassette tape adapters get their energy

I was wondering where the cassette tape adaptors get their energy, looking at this image http://car-mods.wonderhowto.com/how-to/hack-your-cars-cassette-deck-into-wireless-bluetooth-music-player-...
5
votes
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 ...
5
votes
1answer
7k views

DIY kinetic energy harvester

I'd like to make a DIY kinetic energy harvester and wish to use the electromagnetic method to generate electricity. So far I know the following materials that I'm going to use: NdFeB magnet Induction ...
5
votes
2answers
354 views

How to calculate the impedance of a rectifier?

I am working on RF energy harvesting. Now I am trying to calculate the impedance of the rectifier, in order to do the impedance matching. An antenna (50 ohm) receives RF signal (915 MHz) and finally ...
4
votes
3answers
669 views

Energy harvesting to power Xbee

I'm planning on a little experiment with a friend. We're gonna be using 2 Xbee series 1 modules at 3.3V and 50mA. One of the Xbee modules will be sealed in a music instrument and I was wondering: is ...
4
votes
4answers
319 views

For a vehicle, what is the most efficient way to store energy from various inputs?

Background For the past few years I have wanted to make some sort of recreational vehicle that runs on multiple-source renewable energy. For example, a kayak with a trolling motor that gets its ...
4
votes
1answer
325 views

Circuit to harvest power

I am working with a homemade material. I can harvest a power from this system. Thus a load, plugged to short cut my material, is crossed by a current. I would like to really harvest this power, it ...
4
votes
3answers
156 views

UVLO for Energy Harvester circuit

A good background on the problem can be found in the document: (Under Voltage Lock-Out Design Rules for Proper Start-Up of Energy Autonomous Systems Powered by Supercapacitors). The above document ...
4
votes
1answer
217 views

Low voltage AC to DC for energy harvesting

For an energy harvesting application, I need to charge a capacitor using induced voltage due to the movements of a magnet inside a coil. The generated voltage is typically low frequency AC (4-5 Hz) ...
4
votes
0answers
119 views

Is it possible to power a MCU with a button press / touch? [closed]

I hope to use a piezoelectric button to harvest and produce a sufficient energy burst to power ON and bootup a MSP430 for a few ms enough to update a simple data structure (e.g. two integers stored in ...
3
votes
5answers
485 views

Diode type with lowest drop voltage [duplicate]

I make a small solar energy harvester. I'm searching for the type of diode with lowest drop voltage. Any suggestion for the type of diode for me ? Thank you
3
votes
2answers
146 views

I need a powersource based on locomotion (3V 20 mA)

Dunno whether this is the right place to ask this but i'll give it a try. I want my bicycle light to be powered on the sideways motion of my bike. For this i would need a device which is also in '...
3
votes
3answers
653 views

How do energy harvesting ICs like LTC3106 and LTC3105 safely charge lipos?

I'm designing a simple device with a single cell LiPo that I want to be chargeable from a single solar power cell. As I start to look through the data sheets, I'm seeing that the battery charging is ...
3
votes
1answer
167 views

How much energy can a RF harvester capture from a mobile phone

Hi Guys, I've wondered if mobile phones were able to transmit energy to RF harvesters. Is there a way to calculate how much energy can be harvested from a standard smart phone today when placed at a ...
3
votes
2answers
1k views

Harvesting Back EMF Possible?

Let me start by saying that I am not talking about the free energy or "overunity" idea of back EMF. When searching around for information I can only seem to find information from free energy sites, ...
3
votes
1answer
10k views

Creating power from shaft rotation

I am a mechanical engineer and am working on a project. This project consists of a rotating shaft and I would like to generate power from that rotating shaft.The shaft will not be rotating ...
3
votes
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 ...
3
votes
1answer
133 views

Electromagnetic energy harvesting designing problems

We designed a very simple energy harvester made of a little magnet that moves inside a coil. We have a vibrating environment moving at 12 Hz with 10 millimeters peak-to-peak. Our pcb will be ...
2
votes
2answers
476 views

What are the ways to power 5V sensor using solar panels?

I have an outdoor sensor (which will have to work in the winter on Poland, however, we usually have temperature much over -10 Celsius degrees) which needs 5V. The sensor operates 24 hours per day ...
2
votes
3answers
5k views

Generate power from motion

For a pet project of mine, I like to generate power from a rotational motion. (similar to bicycle tire turn). I want to build the system without a battery where as the tire turns I generate enough ...
2
votes
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 ...
2
votes
1answer
951 views

Connecting wind generator to 12V battery without regulator

I've been doing a DIY Wind energy generator. I'm also a newbie in this field. I would like to ask what will happen if I connect my wind turbine to a 12V rechargeable battery without a voltage ...
2
votes
1answer
66 views

Probing with oscilloscope causes current drop

We are testing a fabricated chip with expected output current of around 4mA which is then used to charge a button cell. The input is from a PV cell. However, when we attach an oscilloscope probe onto ...
2
votes
3answers
772 views

Energy harvesting - drain capacitor when voltage is reached, ultra low power

I want to connect tiny solar cell to a capacitor, let it charge it and once voltage reaches 2V - flush it through tiny red LED. Could anyone suggest how to implement that given that charge current ...
2
votes
2answers
214 views

Given a source of mechanical input, can an RC motor charge it's own battery without extra cicuitry involved?

Background I took my RC quadrotor to a windy field this weekend to fly it around. After the battery died, I retrieved it and while carrying it back home, I noticed that the wind was spinning the ...
2
votes
2answers
153 views

Simple RF energy-harvesting circuit

I wanted to dabble a bit in RF energy harvesting. Nothing fancy, just see what's possible. I came up with the following circuit, but I'm a complete layman when it comes to antennas and the like. ...
2
votes
2answers
710 views

Current Transformers and Energy Harvesting

Current Transformers (CT)s work like any other transformer: through Faraday's law of induction, the changing magnetic flux (from the AC current flowing through the conductor) induces a proportional ...
2
votes
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 ...
2
votes
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 ...
2
votes
1answer
80 views

Storing short, small, intermittent pulses of energy

I am running an experiment using graphene at the moment to create energy from different chemical solutions. A link to what I am building on is below: https://phys.org/news/2014-04-team-electricity-...
2
votes
1answer
216 views

Electrical eel electricity harvesting

I am watching this video over and over again and I can't visualize the current flow from the eel, to the two metal plates, to the Christmas tree. Is there a voltage difference between the two plates, ...
2
votes
1answer
961 views

Powercast Powerharvester Chipset PCC110 Issues

I recently picked up a PCC110 datasheet, an RF energy harvester. I assumed the 3 pins would correspond to GND, Antenna, and Vout (the datasheet does not specify). I attempted all of the permutations ...
2
votes
0answers
409 views

Solar charging a lipo battery with ESP8266 as a battery load

I am trying to add solar harvesting capability to my IoT device based on esp8266. I am using linear charge controller (MCP 73831) with solar input to charge a 500maH lipo battery. An observation when ...
2
votes
0answers
186 views

How to light an LED using supercapacitor [duplicate]

I would like to light up a 3W LED from Cree having a forward voltage of 2.9 V at 350 mA. It's maximum drive current is 1 A and gives 300 lumens/m2 output. I am considering lighting up this LED using ...
2
votes
1answer
150 views

switching between solar input and 5V supply

I am designing an energy harvesting system from a low power solar panel. I am using the output of the solar panel to power a high efficiency boost converter which charges a single cell Lithium battery ...
2
votes
1answer
315 views

Bipolar energy harvesting circuit

I'm planning an energy harvesting circuit using LTC3105 (400mA Step-Up DC/DC Converter with Maximum Power Point Control and 250mV Start-Up). The problem is that my energy source is bipolar, although ...
1
vote
3answers
218 views

Why harvesting energy why not harvesting power?

I am wondering why is it called Harvesting energy and why not harvesting power? Energy is measured in Joules/s and power is Watt but the result is watt. For example if we harvest energy from sun or ...
1
vote
2answers
662 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 ...
1
vote
2answers
71 views

Maximum Power Point Tracking for multiple sources

I know there are several commercial products for maximum power point tracking for a single power source (solar cells for example). But does anyone know any solution for the case where there are ...
1
vote
2answers
3k views

Energy harvesting from AC wire

I'm designing a home automation module and finding a way to supply power. Is it possible to harvest energy from existing AC wire using step-up current transformer? Also I can only find step-down ...
1
vote
1answer
679 views

Simple voltage build-up circuit

I'm planning on buying a Raspberry Pi and I want to power it using solar energy. Since the voltage input needed by the Raspberry Pi is 5 Volt, I need to build up the relative low voltage power input ...