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The problem
A small wind turbine generator with MPPT charging and battery storage is a demonstrator-scale wind-energy system that turns wind into stored electricity for a small load. Three fibreglass blades on a horizontal-axis rotor spin a permanent-magnet generator; the generator's three-phase AC output is rectified to DC, and an MPPT charge controller converts that variable DC into the correct charging voltage for a 12 V lead-acid battery, which then powers an LED lamp. Many rural homes and farms sit beyond reliable grid supply, and even where the grid reaches, outages are frequent, so a small turbine that charges a battery whenever the wind blows offers light and phone charging without fuel or a grid connection. This project demonstrates the full chain — aerodynamics, generation, rectification, maximum-power-point tracking and storage — at a scale a student can build, test and explain, rather than claiming to power a whole village.
Wind turns the three fibreglass blades on the horizontal-axis rotor.
Follow the working sequence
How it works
Wind turns the three-blade rotor, and the rotor shaft spins the permanent-magnet generator, which produces three-phase AC whose voltage and frequency rise with rotor speed. A bridge rectifier converts that AC to DC, and the MPPT charge controller takes this variable DC and converts it to the charging voltage the 12 V battery needs, continuously adjusting how heavily it loads the turbine so the rotor stays near its peak-power point as the wind changes. The battery stores the energy, and a switched LED lamp draws from the battery as the load. When the battery reaches full charge, or when a strong gust pushes the rotor too fast, the controller diverts excess power into a dump-load resistor that brakes the rotor. A voltmeter and ammeter display the charging voltage and current throughout.
- Wind strikes the three fibreglass blades and the horizontal-axis rotor starts turning, with the tail vane keeping the rotor facing into the wind.
- The rotor shaft spins the permanent-magnet generator, producing three-phase AC that rises in voltage and frequency with rotor speed.
- A bridge rectifier converts the generator's AC output to DC, which is fed to the MPPT charge controller.
- The MPPT controller adjusts its loading to track the rotor's peak-power point and converts the variable input to the correct charging voltage for the 12 V battery.
- The battery stores the energy; a switch connects the 5 W LED lamp load so stored energy is used after the wind drops.
- When the battery is full or the wind is very strong, excess power is diverted to the dump-load resistor, braking the rotor and limiting its speed.
- The voltmeter and ammeter display battery voltage and charging current live throughout the demonstration.
Tech stack:
- Permanent-magnet generator
- 3-blade fibreglass rotor · steel tower
- Three-phase bridge rectifier
- MPPT charge controller
- 12 V lead-acid battery
- Digital voltmeter · ammeter module
- LED load · dump-load resistor
- Mild steel fabrication · hand tools
| Parameter | Value |
|---|---|
| Rotor | 3 blades, fibreglass (design target) |
| Rotor diameter | Approximately 1 m (design target) |
| Tower height | Approximately 1.5 m (design target) |
| Generator | Permanent-magnet, 3-phase AC, 12 V nominal (datasheet value) |
| Rated output | 50 W at 12 m/s wind speed (design target) |
| Cut-in wind speed | Approximately 3 m/s (expected) |
| Battery | 12 V, 7 Ah lead-acid (datasheet value) |
| Charge controller | MPPT, 12 V system, 10 A rating (datasheet value) |
| Rectifier | 3-phase bridge, 10 A rating (datasheet value) |
| Load | 5 W LED lamp (design target) |
| Dump load | 25 W resistor (design target) |
| Display | Digital voltmeter · ammeter module (datasheet value) |
Project features
The turbine's strongest capabilities are its three-blade horizontal-axis rotor with tail-vane yaw alignment, its permanent-magnet generator with three-phase rectification, its MPPT charge controller that tracks the rotor's peak-power point as wind speed changes, and its 12 V battery storage with a switched LED load. Together these four capabilities cover the complete small-wind chain: capturing wind energy, converting it to electricity, charging a battery efficiently, and using the stored energy after the wind drops. A dump-load braking resistor protects the rotor in strong gusts, while a voltmeter and ammeter let the student watch charging voltage and current rise and fall with wind speed during a demonstration, turning each gust into a visible reading for the report. The whole assembly mounts on a single fabricated base, so the turbine can be carried to a rooftop, a terrace or an open field for testing without rewiring anything.
- [Three-blade horizontal-axis rotor] Three fibreglass blades, spaced 120 degrees apart on a hub, drive the generator shaft directly. The blade pitch is fixed during the build and set so the rotor starts turning at low wind speeds.
- [Permanent-magnet generator with rectifier] A permanent-magnet generator produces three-phase AC as the rotor spins, and a bridge rectifier converts it to DC for charging. No separate excitation supply or slip rings are needed.
- [MPPT battery charging] The MPPT charge controller continuously adjusts its input loading so the turbine operates near its peak-power point as wind speed changes, instead of charging at a fixed voltage that wastes energy in light or strong wind.
- [12 V battery storage with LED load] A 12 V lead-acid battery stores the harvested energy and powers a 5 W LED lamp through a switch, so the lamp stays lit after the wind drops and the stored-energy idea is visible.
- [Tail-vane yaw alignment] A flat metal tail vane keeps the rotor facing into the wind. During the build the vane is aligned square to the rotor axis and its pivot is checked for free movement, because a stiff or skewed vane leaves the rotor edge-on to the wind and produces almost no power.
- [Dump-load overspeed braking] When the battery is full or the wind is very strong, the controller diverts excess energy into a dump-load resistor, which electrically brakes the rotor and limits its speed instead of letting it spin freely.
- [Charging voltage and current display] A digital voltmeter and ammeter module shows battery voltage and charging current live, so the effect of rising and falling wind on charging is visible during the demonstration.
What is included
- Working wind turbine prototype with rotor, tower, generator, rectifier, MPPT controller, battery and LED load
- Wiring diagram and component list
- Charge-controller settings and battery-connection notes
- Step-by-step demonstration and test procedure
- Project report PDF (background, wind-energy theory, MPPT working, methodology, results template)
- Project abstract PDF
- PPT presentation for final review
- Viva Q&A preparation document (rotor aerodynamics, generator, rectification, MPPT, battery charging)
Timeline
- Week 1: rotor and tower fabrication, blade mounting and tail-vane alignment.
- Week 2: generator, rectifier and charge-controller wiring, battery connection and dump-load fitting.
- Week 3: charging tests across wind speeds, display calibration and documentation.
- Week 4: final assembly check, demonstration run-through and report, PPT and viva-kit preparation.
Support
- Setup guidance for siting the turbine in open wind and connecting the battery safely.
- Demonstration guidance covering the wind-to-load chain, MPPT behaviour and the dump-load braking test.
- Documentation support for the report, PPT and viva preparation, including the buyer-run charging test procedure.
Limitations & prerequisites
- Demonstrator-scale output only: the design target is 50 W at 12 m/s wind speed, enough for an LED lamp and small DC loads, not for household appliances.
- Output depends entirely on wind: no wind means no charging, and the battery only powers the load for as long as its stored charge lasts.
- No inverter or grid connection is included: the system supplies 12 V DC only and cannot feed mains appliances or the electricity grid.
- The fixed-pitch rotor and small tower height limit energy capture compared with larger, taller turbines.
- Battery runtime varies with load and wind history, and lead-acid batteries need correct charging voltages to avoid shortening their life.
- The prototype is an academic demonstrator, not a certified or weatherproofed installation, and must be sited and supervised during outdoor tests.
- Power figures are design targets and expected values, not measured results; the student measures and reports the actual charging voltage and current on their own build.
Frequently Asked Questions
How much power does the turbine produce?
The design target is 50 W at a wind speed of 12 m/s, with a cut-in wind speed of approximately 3 m/s, so the turbine produces tens of watts in moderate wind and very little in light wind. No wattage is claimed as measured, because output depends on the wind at the test site. The report includes a buyer-run procedure for measuring charging voltage and current with a fan or in natural wind.
Can this turbine power a house or a whole village?
No — this is a demonstrator-scale turbine sized for an LED lamp and small DC loads, not for a house or a village, and the listing is honest about that scale. It demonstrates every stage of rural wind electrification in miniature, but a home would need a much larger rotor, a taller tower, a bigger battery bank and an inverter. Those are outside this build, and the limitations section states the scale plainly.
What does MPPT do in a wind turbine?
MPPT, or maximum power point tracking, continuously adjusts how heavily the charge controller loads the turbine so the rotor stays near the wind speed where it produces the most power. As wind speed changes, the rotor's best operating point moves with it, and a fixed-voltage charger would waste energy in light or strong wind. The controller follows that moving point automatically.
Does it work when there is no wind?
The turbine generates nothing without wind, but the battery keeps the LED lamp lit from stored energy until the charge runs out, so the lamp stays on after the wind stops. That is the point of the battery: wind energy is harvested when it blows and used later. How long the lamp stays lit depends on the battery's charge level and the load connected.
What happens in very strong wind?
When the battery is full or the wind pushes the rotor too fast, the controller diverts excess energy into a dump-load resistor, which electrically brakes the rotor and limits its speed. This protects the generator and battery from overcharging and over-speeding. The turbine should still be supervised outdoors and taken down in storm conditions.
Is this project suitable for a final-year project?
Yes — for Electrical, Electronics and Mechanical Engineering programs, because it covers rotor aerodynamics, permanent-magnet generation, three-phase rectification, MPPT charging, battery storage and load management in one working build. It gives measurable voltage and current readings for the report, and the MPPT and dump-load behaviour make strong viva discussion topics.
Components & software requirements
- Permanent-magnet generator
- 3-blade fibreglass rotor · steel tower
- Three-phase bridge rectifier
- MPPT charge controller
- 12 V lead-acid battery
- Digital voltmeter · ammeter module
- LED load · dump-load resistor
- Mild steel fabrication · hand tools
Delivery information
Built-to-order project. Delivery timeline is shared after order confirmation based on current queue.
Support terms
Complete documentation, setup guide, and viva preparation included. Support for setup and explanation provided.
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