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Simplest Windmill Generator Circuit

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The post explains how to make a simple windmill generator circuit which can be used for charging batteries, or for operating any desired electrical equipment, all through day and night, free of cost.

Solar Panel vs Windmill

One of the biggest drawback of solar panel electricity is that it's available only during the day time and that too only when the sky is clear. Furthermore, the sun light being at its peak only during midday and not throughout the day makes its harnessing very inefficient.Contrary to this a windmill generator which depends on wind power appears to be much efficient because wind is available all through the day and does not rely on seasonal changes.



However a windmill generator may work with greatest efficiency only if it's installed or positioned on specific regions such as on higher altitudes, near sea or river shores etc.

For a homemade windmill generator to be most efficient one must position it on the roof top of the house in order to get the highest possible wind speed efficiency, the higher the better.

It's said that over 100 meters from ground wind speeds are the maximum and it's active all through the year non-stop, so that proves, higher the altitude better the wind efficiency.

Designing a Windmill Generator

A simple windmill generator circuit concept presented here can be built by any hobbyist for charging small batteries at home, completely free of cost and with negligible efforts.

Bigger models of the same can be tried for achieving greater power outputs which may be used for powering small houses.

 

 

Principle of Operation

The principle of operation is based on a traditional motor generator concept where a permanent magnet type motor's spindle is integrated with a turbine or propeller mechanism for the required harnessing of wind power.

As may be seen in the above diagram, the employed propeller or the turbine structure looks different. Here a twisted "S" shaped propeller system is used which has a distinct advantage over the traditional airplane type of propeller.

In this design the turbine rotation does not rely on the wind directions rather responds equally well and efficiently regardless from which side the wind may be flowing, this allow the system to get rid of a complex rudder mechanism, which are normally used in conventional windmills in order to keep the propeller self adjusting its front position in line with the wind flow.

In the shown concept the motor connected with the turbine keeps rotating with maximum efficiency no matter from which side or corner the wind may be appearing, which allows the windmill to be extremely effective and active all through the year.

Integrating an Electronic voltage Regulator

The electricity generated by the rotation of the motor coil in response to the torque from the turbine can be used for charging a battery or may be for driving an LEd lamp or any desired electrical load as per the user preference.

However, since the wind speeds could be fluctuating and never constant, it may be imperative to include some kind of stabilizer circuit across the output of the motor.

Using a Buck Boost Converter

We can solve the issue by adding a boost or a buck converter circuit as per the specs of the connected load.

But if your motor voltage specs is slightly higher than the load and if there's ample wind, you may exclude the involved boost circuit and directly connect the windmill output with the load after the bridge rectifier.

In the diagram we can seen a boost converter being employed after rectifying the windmill electricity  through a bridge rectifier network.

The following image explains the details of the involved circuits, which are also not so complex and may be built using most of the ordinary components.

Circuit Schematic Setup

 

 

The above image shows a simple boost converter circuit with a feedback error amplifier regulator stage. The output from the windmill is suitably rectified by the associated bridge rectifier network and fed to the IC 555 based boost rectifier circuit.

Assuming the average windmill motor output to be around 12V, the boost circuit can be expected to boost this voltage to upto 60V+, however T2 stage in the circuit is designed to restrict this voltage to a specified stabilized output.

The zener diode at the base of T2 decides the regulation level and can be selected as per the required load restrictions specs.

The diagram shows a laptop battery being attached for charging from a windmill generator, other types of batteries may also be charged using the same circuit, simply by adjusting the value of the T2 zener diode.

Alternatively the number of turns of the boost inductor can also be altered and tweaked for acquiring other voltage ranges, depending upon the individual application specs.

Video:

The following video shows a small windmill set up in which a boost converter can be seen attached with a motor, and converting low power output from the motor to illuminate a 1 watt LED.

Here the motor is rotated manually with fingers, so the results are not so good. If the set up is attached with a turbine then the outcome can be much more enhanced.

Reader Interactions

Comments

  3. For my project I have been restricted to use a MOSFET and Gate Driver for switching. Can you please suggest which would work best here?

    Reply

  5. Sir u’re doing great in ur blog keep it up,
    sir I want to build 100kva inverter ,now my question is as follows.
    • I want my tras4mer rating to be 1500watts and 1800amperage.
    • I will be using 8 irfp2907 mosfets, 4 at the lower side and 4 at the upper side and I want to use 2 tip31 as the driver for both the upper and and lower mosfet.
    • I will aiso be using ic4047 as the heart of the inverter which is sine wave.now I want to know if I can be able to generate maximum power of about 1500watts at the output with 12v 30amps battery. And also how many turns or guage I’m I suppose to use at the primary and secondary coil. But if it is not possible to achieve this maximum power then guide me on how to achieve this maximum power rate.
    • Can all mosfets be attached on heat sink without an insulator then if it can’t be what are other insulator situable for mosfet apart from mica insulator cos I can’t get reach of thermal paste. Pls I need quick response

    Reply

    • 1500 watt with 1800amps? I think you meant to say 180amps. Still that sems incorrect, if you divide 1500/180 gives 8V…so battery must be 8V for that

      If it is 180 amps how can a 30 AH battery deliver it? for 180 amps you would need a 1000AH battery or at least a 500AH battery

      better to use separate heatsinks for the mosfets on the two channels of the inverter, on individual channels if parallel mosfets are employed then those can be connected without isolators…

      Reply

  6. Sir i have an idea, can i use a Motor Bike generator? then i want to install two windmill and one solar, please do you have a circuit that the three can work with the principle of charging one battery?

    Reply

    • Deogratia, you can simply add separate bridge rectifiers with each of the sources and join their outputs in common with the battery.

      for cut off you can perhaps add a single controller circuit between the battery and the bridge outputs.

      Reply

  8. Dear sir,

    Your explanation is very simple,that is very good for learning.But,I have a problem.What are the features,configurations of the wind motor/generator set.As the same time hybrid also what are the features of the generator set.Why use DC generation at the hybrid set except the AC.
    Thank you for your kind cooperation.

    Reply

  9. hello sir … can I ask you a quick question ? if I use a 12v dc motor and I use this your circuits how much voltage output can I get …im planing to use this to charge laptop

    Reply

  10. Hello,

    I am final year engineering student. I am building a project that will combine solar power and wind power to charge a battery for 100Watt AC power inverter circuit. Can you please help me with it. Can you please send me available data to my mail address peru5194@gmail.com

    Thank you for help.

    Reply

  11. Good day mr.majumdar. I like your post and also I need that for my brother's project. If I change zener diode to 5v. Can I use that cellphone charger? Im waiting for your response thank you.

    Reply

  12. Swagatam, you have an interesting strobe circuit which hasn't a comment area I wish to address.I don't know if you have viewed the "atomic flashlight" commercial. Well what I'm attempting to build is the " the strobe light that wards off attackers " circuit. I want to place several on separate(i have built already) pir's around the battery vault I have for my wind generator. I have a sercurity line attached to the vault but…

    Reply

    • Hi Cuyler, just now I watched the atomic flashlight video and I found the "square" light impression on the ground quite interesting which could be difficult to achieve using ordinary LED flashlights.

      However as far as warding of attackers is concerned it could be probably achieved through ultra high bright LEDs assembled inside prismatic reflectors….the variable strobing effect could be effectively implemented using a IC 555 astble circuit configured in the PWM mode.

      Such lights will be quite capable of causing an instant headache for anybody looking at it even for a couple seconds…

      Reply

  13. i plan on a vawt which spins ccw with a ratchet catch at the base to ensure this. so for the motor i will be using a dc motor from a dc treadmill. do i still need the bridge rectifier? i grew up only using bridge rectifiers on a-c circuits so am i missing something here?

    Reply

    • If your motor rotational direction is fixed then the bridge will not be required, but if it is not fixed then a bridge would be required for ensuring that the connected battery always gets a supply with a fixed polarity regardless of the motor rotational direction.

      Reply

    • Thanks for the most timely reply. Whew i thought I had been doing something wrong for the past 45 years! I read an article about regenetive braking in which the author touted "dc motors do not produce electricity. And then goes on about a-c motors do in this scenario in which HIS a-c motors should be purchased.

      Reply

    • DC motors are actually better suited for generating electricity than AC motors, so I think the article which you read has suggested just the opposite 🙂 please go ahead with your earlier plans and use a DC treadmill motor

      Reply

  15. hi, As you have said you used PMDC generator then it generates DC why would you rectify it again?
    Actually a developer who has developed his own wind turbine(which has PMDC motor in it) and solar panel the specifications are:
    solar panel:
    pmax=110W.Vmax=12.25V.Imax=5.79A.Open ckt voltage=21.7V.short circuit current=5.90A.module effeciency=13.3%.No of cells=36.
    wind turbine:PMDC,vMax=90V,rpm=2500,current=3.90A.
    He gave me the weather forecast details about his location(mostly in punjab) And now he wants a charge controller to charge his 150Ah smps battery. I want to take this as my project and build a final product. But, as i will be performing in lab how to check correctness of my circuit without actually having the solar panel and wind turbine? That is if i have to show it to my proffesors i just cant take them to site i need to show in lab.But i am clueless as to how to start like this? Can i simulate solar or wind V-I characteristics partially(in lab) to show how my circuit could charge the batteries..How do i go with it? After having analysis on wind speed in his location it appears that wind speed is about 3.5 to 4.5m/s max and voltage variation is 7-10V so i need a boost converter here and a buck converter for solar.

    Reply

    • Hi, the above shown windmill design could be rotated clockwise or anticlockwise depending on the wind direction, that's why a bridge is included so that the output is always a single supply DC regardless of the wind direction.

      you can perform a lab test by using a variable voltage and current DC power supply as shown in the following diagram:

      https://homemade-circuits.com/2012/01/how-to-make-versatile-variable-voltage.html

      According to me you can use the following buck converter design for both wind and solar inputs:

      https://homemade-circuits.com/2015/05/5v-pwm-solar-battery-charger-circuit.html

      the output volts and current can be adjusted by suitably changing the R9 and R13 values.

      Reply

      • hi Disha Karnataki
        if you make your project can you please content me i need your help my email is “”awaisraza4848@gmail.com”
        thanks in advance

        Reply

    • thanks.
      I want to start my design with a buck converter for 12V 150Ah smps battery. As here i mention smps battery i understand its wet battery so the charging cycle is different for sealed and wet battery hence,i need to have two different charging cycles provision leaving at the choice of consumer can i do this?
      But how do i start designing a buck converter for a given rating?

      Reply

    • What type of charging cycle are you looking for? according to me it would be the same for both the variants just make sure it's switched OFF on full charge.

      for a designing a buck converter you'll need to study all the basics first, you can find the relevant articles in this website through the search box, or through other online sites.

      Reply

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