Portable Hybrid Rapid-Deploy Renewable Generator

When I previously built a helical Vertical Axis Wind Turbine designed for urban wind*, it worked about as intended. It captured chaotic, low-speed wind from any direction. However, after extensive testing I realized that because of its size and design priorities, it couldn't spin very fast. It generated energy, but it took a long time to accumulate enough usable power unless multiple units were connected together in series or parallel.

It was a strong proof of concept that wind energy could be produced from 3D printed blades and be made portable, but it really wasn’t very practical in urgent situations.

I noticed this especially during Winter Storm Fern, when power went out in my city. Since it was very windy, I wanted to see if I could capture some of that wind with my old design. However, design limitations caused it to either fall over due to a weak base or not spin fast enough to make enough energy to do anything. I realized that when the electricity goes out, speed suddenly matters in a different kind of way. You want renewable energy quickly. This motivated me to create something that can start generating power almost immediately, charge a battery fast, and be useful during emergencies, camping, or disaster recovery.

Around the same time, I saw the Let There Be Speed contest. That shifted my thinking. Instead of optimizing my design for continuous low-speed capture, I thought: How can I redesign it to make renewable energy fast?

By fast, I mean fast in multiple ways:

1. Faster rotational speed
2. Faster voltage generation
3. Faster battery charging
4. Faster usability in real-world situations
5. Fast deployment

This new project builds on my previous VAWT but addresses new priorities. Instead of optimizing purely for turbulent urban conditions, I focused on increasing rotational speed, improving electrical response time, and integrating additional renewable energy inputs to accelerate total energy production.

The result is a redesigned renewable energy system built to generate energy quickly without losing portability.

This project is a Solar/Wind Hybrid Renewable generator designed specifically for rapid energy production and mobile charging. It is not optimized for maximum energy storage. Instead, it aims to provide enough energy to charge a mobile phone in emergencies.

The result is a low-cost (~$75 including a 10 Ah battery and a USB-C charger) multi-directional wind turbine and solar panel generator to extract usable energy quickly in all conditions.

Note: I will begin with an introduction of the project for the Let There be Speed Student Contest, if you are here to build your own renewable generator, skip to step 22. However, to fully understand why it is the way it is, I recommend reading through the whole thing as much as possible.

Note #2: This is not completely a beginner course, you will have to solder some stuff, and to some degree you will have to make the best choice of what to buy and where from depending on what you need based on your setup and what can be bought where you live.

Note #3: Here is the link to the Github if you would like to contribute your designs to the project: I-s-h-a-n-C/Hybrid-Solar-Wind-Energy-Harvesting-System: A (as much as possible) compact modular hybrid renewable energy system that combines a wind turbine and a solar panel with integrated lithium battery storage. The system is designed for microgeneration, capturing energy from both wind and sunlight to provide stable, buffered power for low-voltage electronics and small-scale applications.

* See here: Modular Helical Vertical-Axis Wind Turbine for Urban Wind : 21 Steps (with Pictures) - Instructables

Full Disclaimer: None of these are affiliate links, so feel free to buy these from wherever you find them, I just thought I'd make it easier to source parts.

Design

1. Fusion360
2. OrcaSlicer (or any other slicing software)

Items

1. Any DC, Low RPM, Non-Geared, Brushless Motor [~$18]
2. The lower the RPM, the better
3. For the specific dimensions of this project, it must have 8mm output shaft and a 52mm dimeter (standard dimensions)
4. 3D Printer Filament (~1 kilogram of white or light colored PETG) [~$10]
5. Actually only ~800g used in the design, but increased estimate due to failed prints
6. Lithium Li-ion Battery bank module [~$2]
7. 2x High Efficiency DC-DC Buck-Boost Converter Module [$11]
8. M4 x 400mm/16-Inch Fully Threaded Rod & Studs [~$4]
9. USB C to 2 Pin Bare Wire Open End Power Cable [~$7]
10. 4x 5V 200mA Photovoltaic Solar Cells (110mmx60mm) [~$12]
11. 10 Ah Lipo Battery (Ah doesn't matter, but the bigger the better) [~$18]
12. Schottky Diode [~$0.10]
13. Copper Wire [~$0.10]

Total cost of items: ~$80 (Estimates based on my cost in the US)

I bought most of the parts from Amazon, so if you buy everything from AliExpress it will be even cheaper (closer to $60-65).

Tools

1. Large 3D Printer (check local universities/community colleges or public libraries, they often have them)
2. Wire Cutters
3. Multimeter (for testing)
4. Soldering Iron
5. Flux
6. Solder
7. Strong Glue

Recommended but not absolutely necessary

1. Solder Wick
2. Metal Weights
3. Rosin Flux

As mentioned in the introduction, this design was created, first and foremost, to be used in emergency situations. The primary goal of this design is to ensure that in emergencies, if/when power goes out, phones can still be charged.

This is secondarily for camping, but since the usable power is focused on speed over high wattage, it might not be as practical as a purchasing a camping generator. However, it is still much more environmentally friendly and cheaper than a consumer-grade camping generator.

In this project, speed is both about reaching a high rpm, fast response and fast usable output.

The turbine is designed to start generating energy quickly, even in low, turbulent wind. By reducing mechanical resistance and using a (moderately) low-RPM generator and 4x 200mA 5V solar panels, the system begins producing voltage at lower wind speeds and moderate sun instead of waiting for ideal conditions.

The electrical system is also optimized for speed. 2 low-voltage harvesting circuits capture energy as soon as it is produced, allowing the battery to begin charging quickly. Because energy collection starts earlier and continues consistently, stored power builds faster. This makes it practical to charge small devices like a phone without long delays in an emergency or when camping.

To improve rotational speed and smoothness, I used Fusion's simulations and went through several iterations to refine blade geometry, balance, and weight. By adjusting curvature, twist rate, and overall proportions digitally before printing, I was able to optimize the turbine to spin fast even in weak, chaotic wind.

Forces and velocities acting on a Darrieus turbine for various... | Download Scientific Diagram

I wanted to create a system that could generate energy quickly for post disaster relief and camping.

Portable solar panels are highly effective in direct sunlight, but they stop producing energy at night and lose efficiency in shaded or cloudy environments. Wind, especially in cities, behaves differently. It is inconsistent and turbulent, but it can occur at any time and is especially strong at night or during storms when solar panels produce little or no power.

By integrating both systems, I was able to balance the weaknesses of one system with the strengths of the other:

1. Solar provides steady daytime generation when sunlight is available.
2. Wind provides generation during cloudy weather, nighttime, or high-wind conditions.

This hybrid approach increases overall reliability in multiple scenarios and translates into rapid energy generation in rare instances when both wind is high and it is very sunny. Instead of depending on a single environmental condition, the system aims to capture energy from both light and motion.

And it does all of these at a low cost.

Lift-based turbines spin faster than drag-based designs because they use aerodynamic lift rather than wind resistance to spin. A higher tip speed ratio allows the blade tips to move significantly faster than the wind itself, increasing generator input speed (and by extension energy output). Blade curvature and twist allow optimal airflow interaction along the length of the blade, improving rotational efficiency. Lighter blades accelerate faster due to reduced rotational inertia, and proper infill density allows blades to support their own weight.

(a) Lift type vertical axis wind turbines (VAWTs) and (b) Drag type VAWT. | Download Scientific Diagram

What separates this design from any other consumer-grade off-grid solar energy generation is the incorporation wind energy into the design. This is done with the Gorlov-style Vertical Axis Wind Turbine mounted on top of the base.

I chose the Gorlov Vertical Axis Wind Turbine because it combines the directional flexibility of a vertical-axis turbine with the smoothness of a helical blade design.

A Gorlov turbine uses twisted (helical) blades instead of straight ones. As bizarre as it looks, it provides several advantages:

1. Some portion of the blade is always at an effective angle to the wind.
2. The twist spreads aerodynamic forces along the height, minimizing pulsing.
3. Less vibration means lower mechanical stress and better durability.
4. Improved self-starting behavior in turbulent, low-speed wind.
5. Gorlov VAWTs spin in one direction, allowing for the use of a DC motor.

In urban and camping environments, wind is inconsistent and multi-directional. A Gorlov VAWT does not need to face the wind, and its helical structure prevents the dead zones common in straight-bladed designs.

It may not produce the absolute highest peak efficiency under ideal conditions, but it performs more reliably and spins faster in real-world wind compared to other VAWT designs.

Different types of VAWTs [8] | Download Scientific Diagram

This version of VAWT uses better blade geometry to generate more lift and higher RPM, alongside a taller and structurally reinforced design to reduce vibration losses. The base was widened and made heavier to improve stability under higher rotational speeds. These changes reduce drag, improve balance, and allow the turbine to spin faster in moderate wind conditions.

PPT - Euler Theory for Wind Turbines PowerPoint Presentation, free download - ID:9447042

A non-geared, low-RPM brushless generator was selected to reduce mechanical losses and improve durability while maintaining efficiency at moderate (to high) wind speeds. Brushless designs minimize friction and wear, which increases reliability and energy conversion efficiency. The 8mm shaft provides mechanical strength under higher rotational loads, while the 52mm diameter supports improved torque generation. The key tradeoff is torque versus speed: sufficient torque is needed to overcome startup resistance, but higher rotational speed increases voltage output.

DC was used because Gorlov style VAWTs only spin in one direction, it eliminates the need for rectification which would invite further complexity and further energy losses.

Technical Manual Series: Brushless Motor Structure and Rotation Principles

Two buck-boost converters are used so wind and solar can be independently regulated to optimal charging voltage before entering the battery. Voltage regulation increases charging speed by maintaining consistent power transfer regardless of fluctuating input conditions.

Battery buffering allows intermittent generation to accumulate into usable energy, increasing effective output speed. USB-C was selected because it supports higher current delivery and with Apple's switch to making Iphones USB-C, it can be used to charge most phones.

Buck-Boost Converter: What is it? (Formula and Circuit Diagram) | Electrical4U

This design is based on existing systems that allow houses to be powered through both solar and wind, adapted for a smaller system.

The system uses a hybrid architecture where wind and solar independently generate power, both feeding into regulated buck/boost converters before charging a shared battery, which then supplies stable USB-C output to a phone.

1. Wind flows through turbine → generator → converter → diode → battery
2. Solar flows through panels → converter → diode → battery.

Regulation is essential because both wind and solar produce fluctuating voltage that cannot safely charge a battery directly. The battery acts as a buffer, smoothing inconsistencies and delivering constant, fast, usable output. This structure prioritizes controlled energy flow, which is fundamental to achieving charging speed.

Hyvrid-Wind-Solar-Turbine-Generator-Diagram_9bce9fa4-2024-4d07-ad15-1492fc229d55.jpg (1400×800)

The system is engineered for rapid emergency deployment, so it has a stable base that resists tipping under wind load and reinforced structural supports to prevent vibration-induced failure. Setup requires minimal assembly time, allowing for fast setup.

The turbine and panels are designed to pack compactly for portability while maintaining structural rigidity when deployed.

This idea was given to me by a commentor on my previous design, so I made sure that it wouldn't wobble.

The final system wiring separates wind and solar input paths, each passing through its own buck/boost converter before connecting to the shared battery management system.

Each component is clearly labeled to distinguish generation, regulation, storage, and output stages.

I find it easier to CAD if I have a reference, so I sketched out the design plan for the blades and the base on paper.

This design was designed to be built using accessible materials and easy to use tools. Since I used a cheap, available $20 motor, I also decided on 3D printing, because it cuts down on the parts needed and can be used to create an optimized design which would be otherwise difficult to construct with PCV pipes or other such materials.

Even though this is designed to be outside in the sun, since PETG is decently warp resistant and relatively cheap (only ~$10 in the US), I decided it would be the best way to make it.

The Blades are fully designed in Fusion360.

The blades are shaped into a smooth helical twist around the central axis, with 3 supporting ribs in the center. The top and bottom of these are threaded to ensure that the motor and threaded rod connect easily, and there is a degree of leeway to ensure that both the rod and motor couple smoothly.

I had a few key considerations in making this design:

1. maintain consistent curvature across all blades
2. keep spacing symmetrical around the shaft
3. avoid sharp bends that introduce stress or imbalance
4. maximize lift and minimize parasitic drag

The goal for this VAWT is to ensure that it captures the maximum wind energy to spin fast and at lower speeds.

At this point, I cut the design in half for easy printing. They are the same height, so they can easily be glued to each other and the rod can couple with the motor easily.

Once one module for iteration 1 was printed, I screwed it to the motor and took it outside. I noticed that while it did self start and it did spin, it didn't do so very fast. Since my goal for the design was speed, I decided to redesign the blades to capture more lift.

The new turbine design was completely reworked in Fusion360, this time focusing on maximizing speed. Instead of just scaling the previous model, I refined the blade geometry, adjusted proportions, and increased structural stability and infill density. The base was widened and strengthened to prevent tipping, and overall weight distribution was balanced to reduce vibration (since it will reach higher rotational speeds).

I had a few key changes in the redesign:

1. increased rotational speed without sacrificing structural integrity
2. reduced mechanical resistance to improve startup in low wind
3. improved balance to minimize wobble and energy loss

The goal of this redesign is to ensure that the turbine not only spins faster, but begins generating usable energy earlier and delivers it as quickly as possible in real-world conditions.

The turbine was redesigned with rotational speed and fast startup as the primary design goals. The final rotor measures 350 mm tall and 330 mm in diameter, which gives a blade radius of 165 mm. This size increases the amount of wind the turbine intercepts while still keeping the rotor light enough to accelerate quickly (due to the relative lightness of PETG). The swept area of the turbine is approximately 0.115 m², which allows it to capture useful energy even in lower urban wind speeds.

The blades use a Gorlov-style helical twist of about 60° over the height of the rotor. This twist distributes aerodynamic forces gradually along the turbine instead of all at once. In straight-bladed vertical turbines, each blade experiences strong pulses of drag as it rotates. Those pulses slow the turbine down and reduce rotational speed. In a helical design, only a small portion of each blade is facing peak wind force at any given moment, which keeps the rotor spinning smoothly and allows it to maintain higher RPM.

The turbine was optimized for typical urban wind speeds between 5 mph and 8 mph (2.2–3.6 m/s). In these conditions the rotor typically reaches 250–350 RPM, which is fast enough for the generator to begin producing usable voltage. In stronger wind around 10–12 mph, the turbine can reach approximately 450–600 RPM (theoretically at least), significantly increasing electrical output. Because the generator is designed for lower rotational speeds, useful power generation can begin as low as ~100 RPM, which allows the system to start producing electricity quickly once the wind begins.

Blade mass was also minimized to improve acceleration. Each blade weighs roughly 130-140 grams, and the entire rotor assembly is under 400 grams. Lower rotational inertia allows the turbine to spin up rapidly during short wind gusts, which is important in turbulent environments where wind direction and strength constantly change.

The 330 mm diameter was chosen because increasing radius increases the tip speed of the blades. For example, at 300 RPM, the blade tips travel at roughly 5.2 meters per second, which helps maintain aerodynamic lift and improves generator efficiency. This higher tip speed ratio allows the turbine to extract more energy from the wind compared to slower drag-based designs.

Note: I am still learning the best ways to create the VAWTs, so my math may be very slightly off, but as you will see with the testing it does work out similar to my plan.

I recently discovered that Fusion 360 can run simulations natively, so I tested how structurally sound the design was. I am still learning to conduct proper simulations and how to interpret results, but it seemed to me that the base structural support ribs would not withstand high rotational forces, so I modified the ribs to be slightly wider and have greater infill density.

At this point, I cut the design into 2 different modules. The first module is moderately tall, designed to the on top; the second one segment shorter, designed to be on the bottom. These can be connected to each other by inserting the pegs for which holes have been made, screwing them into a rod, and then gluing them together. This saves on filament costs for supports.

I made some key changes:

1. Changed to 2 different module heights for greater structural stability
2. Increased infill density to withstanding greater rotational forces
3. Created pegs for a stronger connection

Note: I adjusted the design to have a slightly elevated bit for easy coupling after I had already printed it and realized that it could be annoying, so my prints are not as ideal, but if you print from these models there won't be any problems.

I then began to design the base. I wanted to ensure that vibrations from the blades had somewhere to go, so I decided on a moderately long based to ensure that it wouldn't topple, with ample space for the internal circuitry and for charging a phone inside. I added 4 slots for solar panels with holes for the wires to feed into the internals. For easy assembly and printing, I cut it into 4 parts with enough tolerance to print smoothly, but tight enough to keep it waterproof. I ensured that the design would support as many motors as possible with space for different screws.

I would however still recommend adjusting the design as needed for your specific motor.

Note: I adjusted the design to accommodate several motor types after I had already printed it and realized that it wouldn't fit my motor, so my design had to be fixed after printing, but if you print from these models there won't be any problems.

Slicing the models depends greatly on what 3D printer you have and what slicing software you use. Some general advice I would offer is to make sure infill density is between 5-6% on the blades, ~8% on the base, and that the speed is set to medium. I would also recommend printing each part one at a time to ensure that a misprint doesn't waste too much filament.

I added the .f3d file so you can adjust the peg's tolerance for your 3D printer.

Also, keep in mind that I am using different colored PETG for testing purposes, if you want to make your own, use white PETG. When I remake a new one for actual use I will also use white PETG. Other colors absorb more sunlight which converts to more heat. PETG is sun resistant, but no need to invite more heat than needed, especially since there is a LiPo battery inside the base which is known for responding poorly to heat.

Assembling the blades is probably the easiest part. All you have to do is line up the holes and push the pegs though. Optionally, if you don't want to take it apart, you can add glue as you assemble it, but it will be pretty strong with just the pegs without glue.

The base assembly is a little trickier. I would recommend starting by gathering all materials in one place. For a better guide on wiring, refer to Step 11.

To start, place all components on your workstation (don't yet connect the bases to each other with pegs).

Solar

1. Add the solar panels to the bases and slide the wires into the holes
2. Solder the solar panels in parallel and then to the 5V buck-boost

Wind

1. Solder the wires of the motor to the other 5V buck-boost
2. To hold up the motor, print out to motor stand file attached and put it under the motor, making sure not to strain the wire (.f3d included to make it easy to adjust for different motors)

Rectification

1. Solder copper wire to each buck-boost
2. Solder the positive side of each buck-boosts to a Schottky diode
3. Solder copper wire to the Schottky diode
4. Solder the two positives and two negatives into one positive and one negative

Battery bank module

1. Solder the positive to the + input and the negative to the - input
2. Solder the battery's red wire to the + battery and the black wire to the - battery
3. Solder the red wire of the USB cable to the + output and the black wire to the - output

Once you are done, the inside will look a little messy, but now all you have to do is using the pegs connect the two parts of the bases together and the cover with the caps.

I tested the solar panels and wind turbine separately then together.

The solar panels alone generate:

1. Full direct sun ~200 mA (4 W)
2. Light clouds ~120–160 mA (2.8 W)
3. Bright shade ~40–80 mA (1.2 W)

I then tested the wind turbine:

1. High wind ~3-4 W
2. Moderate wind ~2.5 -3 W
3. Low-Moderate wind ~1 W
4. Low wind ~.5 W

Together they generate:

1. High wind + full sun ~8.5 W
2. Moderate wind + full sun ~6.8 W
3. Moderate wind + light clouds ~3.8 W
4. Low-moderate wind + full sun ~5 W
5. Low wind + full sun ~4.5 W
6. Low wind + bright shade ~1.7 W

You can also scale up the wind blades and modify the threading to create a more permanent turbine for home use. For this version, printing the parts in ASA is recommended because it handles outdoor conditions better. Applying a UV-resistant spray will help protect the plastic from sun damage and extend its lifespan.

3D printing it this way will require it to be cut in more parts and more pegs to be added to the design for even most large 3D printers.

If you choose this route, you will also need a higher quality generator motor. With a larger turbine and the right motor, the system can produce significantly more power, potentially around 40 watts or more. At that level, it could run small lights or other household devices, though doing so safely requires a basic understanding of electrical work.

Focusing on speed was the major design motivation. In my previous turbine project, the goal was mainly to capture turbulent urban wind from any direction. While it worked as a proof of concept, testing showed that it typically produced around 1 W. At that output level, it could generate energy, but it took a long time to actually accumulate enough power to be useful for anything.

For this project, I began thinking about energy in terms of how quickly it could be used. In emergencies or power outages, the most important factor is how fast a system can begin producing power and charging a battery.

To achieve this, I redesigned the blades to increase rotational speed and reduce resistance so the turbine could spin faster and start generating energy earlier. I then made improvement to the base that reduced vibration and allowed higher RPM, and the electrical system was designed so both wind and solar inputs begin contributing power as soon as they produce voltage.

The results show a strong improvement. The new turbine alone can generate 2.5–4 W in moderate to strong wind, compared to 1 W from the previous design. When combined with the four solar panels, the hybrid system can reach 6–8 W in strong sun and wind, allowing energy to accumulate much faster.

A future goal is to scale this design into a more permanent wind turbine system. This would involve printing structural components in more weather-resistant materials such as ASA, adding UV protection, and strengthening the structure for continuous outdoor use.

A larger turbine would also allow the use of a higher-capacity generator motor, which could increase power output significantly. With larger blades and a stronger generator, the system could potentially produce 30–40 watts or more, making it practical for powering lights or charging larger batteries.

Outside wind energy, I also aim to create a system that harvests energy from smaller waterfalls, for industrial use and for city governments to go green.

This project builds on the work and research of others.

My vertical axis wind turbine concepts and helical blade research were inspired by research and resources from MDPI, IIT Delhi, Energian, ResearchGate, and WIT Press. I have linked all of my sources on the specific step in which I implemented the research/information.

All CAD models were designed by me using Fusion360, all simulations were done in Fusion360, slicing was done using OrcaSlicer, and 3D printing was done at APSU's makerspace. I would not have been able to complete this project without Fusion360's student plan, and the developers who made OrcaSlicer free and open source.

Finally, thanks again to my family who tolerated a growing collection of printed turbine parts, test assemblies, and solar and wind experiments.