What is a Helical Vertical Axis Wind Turbine?
A helical vertical axis wind turbine (helical VAWT) is a modern wind turbine where three or more aerofoil blades twist gradually around a vertical shaft, forming a helix. Unlike traditional horizontal turbines, the helical design rotates around a vertical axis, so the turbine catches wind from any direction without needing to turn into the wind.
The Windora helical wind turbine is engineered specifically for Indian wind conditions — low average speeds, turbulent gusts, and mixed-direction wind flow over rooftops and urban sites. It is one of the most efficient small wind turbines available in India for homes, offices and shops.
Why helical works for Indian rooftops: The continuous twist along each blade smooths out torque pulses, eliminates vibration and noise, and lets the turbine self-start at very low wind speeds — exactly the kind of wind found in most Indian cities.
Technical Specifications
| Parameter | 1.5 kW | 3 kW | 5 kW | 10 kW |
|---|---|---|---|---|
| Rated Power | 1.5 kW | 3 kW | 5 kW | 10 kW |
| Start-up Wind Speed | 1.5 m/s | 1.5 m/s | 1.8 m/s | 2.0 m/s |
| Rated Wind Speed | 10 m/s | 11 m/s | 11 m/s | 12 m/s |
| Survival Wind Speed | 50 m/s | 50 m/s | 52 m/s | 55 m/s |
| Blades | 3 helical aerofoil blades, fibreglass reinforced | |||
| Generator | Three-phase permanent magnet (PMSG) | |||
| Noise Level | < 35 dB at 5 m distance | |||
| Tower Height | 3 m | 5 m | 6 m | 9 m |
| Design Life | 25 years | |||
| Warranty | 15 years (extendable) | |||
Who is the Helical Wind Turbine for?
Our helical vertical wind turbine is the right choice if any of these apply:
- Homeowners in Indian cities looking to cut electricity bills by 40–80%
- Apartment owners with terrace access and society approval for rooftop installations
- Bungalow / villa owners with open land or rooftop space
- Small office and shop owners wanting to escape rising commercial tariffs
- Schools, clinics and NGOs running daytime operations
- Anyone living in low-wind areas where traditional horizontal turbines don't perform well
Key Features & Benefits
1. Starts in extremely low wind
Begins generating at 1.5 m/s — most Indian cities see average annual winds of 3–6 m/s, putting them well within the operating range. Traditional horizontal-axis turbines need 3–4 m/s just to turn.
2. Whisper-quiet operation
Operating noise stays under 35 dB at 5 metres — quieter than a refrigerator. Safe to install above bedrooms and in dense residential neighbourhoods across Mumbai, Pune, Bangalore and similar Indian cities.
3. 360° wind capture
Vertical axis means no yaw mechanism — the turbine accepts wind from any direction. Critical for urban Indian rooftops where wind direction changes constantly.
4. Bird and bat safe
Slow tip speeds and visible helical blades give birds and bats time to avoid the rotor. A genuine green energy choice.
5. Ground-level service
The generator and gearbox sit at the base of the mast — no expensive cranes needed for maintenance, unlike traditional horizontal turbines.
Expected Power Generation in India
Annual energy output depends on your site's wind resource. Typical ranges for a Windora helical VAWT:
| Model | Low wind site (3 m/s avg) | Medium (4-5 m/s avg) | High wind (6+ m/s avg) |
|---|---|---|---|
| 1.5 kW | ~2,000 kWh/yr | ~3,200 kWh/yr | ~4,500 kWh/yr |
| 3 kW | ~4,500 kWh/yr | ~6,500 kWh/yr | ~9,000 kWh/yr |
| 5 kW | ~7,500 kWh/yr | ~11,000 kWh/yr | ~15,000 kWh/yr |
| 10 kW | ~14,000 kWh/yr | ~21,000 kWh/yr | ~30,000 kWh/yr |
Installation Locations Across India
We install and service Windora helical wind turbines across all major Indian cities — Mumbai, Pune, Delhi, Bangalore, Chennai, Hyderabad, Ahmedabad, Kolkata, Jaipur, Surat, Lucknow, Nagpur, Indore, Bhopal and many more.
Frequently Asked Questions
How much does a 3 kW helical vertical wind turbine cost in India?
A 3 kW Windora helical VAWT typically costs ₹3 lakh to ₹5 lakh including tower, controller and basic installation. Exact pricing depends on tower height, foundation, distance from your meter, and whether you add a hybrid solar component or battery storage. Request a free video analysis for an accurate quote for your location.
How long does the helical turbine last?
Designed for a 25-year operational life with minimal maintenance — annual visual inspection and lubrication is all that is typically required. We offer 15-year warranty (extendable) on the turbine and 25-year warranty on the structural tower.
Can I install this turbine on my apartment terrace?
Yes, provided you have society / housing board permission and the terrace has adequate load-bearing capacity. We assess this in the free site survey. The 1.5 kW and 3 kW models are sized specifically for apartment rooftops, with low vibration mounts that protect the building structure.
Does the helical wind turbine work in monsoon?
Yes — in fact, wind turbines perform their best during monsoon when wind speeds rise and solar panels under-perform. Our turbines are sealed for IP65 weather protection and have been tested at cyclonic survival wind speeds up to 50 m/s.
Is this turbine eligible for government subsidy?
Small wind turbines may qualify for state-level renewable energy incentives in certain states (Gujarat, Maharashtra, Tamil Nadu, Karnataka and others), plus accelerated depreciation benefits for commercial buyers under the Income Tax Act. We help our customers identify and apply for applicable schemes.