4M AL13 Power Tower™ Turbine

Exclusively available to installers, EPC contractors and commercial clients for medium to large scale commercial projects only. 

Lead time:  2-3 months from ordering

Minimum order quantity: 5

ITS is proud to be UK representatives for the medium to large scale commercial market for Flower Turbines.  Flower Turbines is the global leader in high-performance vertical axis wind turbines (VAWTs). ITS support EPC contractors, renewable energy installers, developers, and commercial organisations in integrating Flower Turbines’ innovative wind systems into  projects across the UK.

Whether you are enhancing an existing solar installation or designing a new multi-technology renewable system, Flower Turbines delivers a unique combination of efficiency, elegance, and outstanding performance—especially where traditional wind and solar solutions face limitations.

Additional information and technical specifications available on the Flower Turbines website. 

The Cluster Effect – Maximum Output From Minimal Space

One of the most powerful advantages of Flower Turbines is the Cluster (Bouquet) Effect.
Most wind turbines experience performance losses when installed close together. Flower Turbines do the opposite. With four turbines positioned together producing more than eight turbines separately.

AL13 Turbine Datasheet

AL13 Turbine Installation Guide

AL13 Power Tower

Modular, Cost-Effective Vertical Wind Energy

The AL13 Power Tower product line is the most cost-efficient wind solution in the Flower Turbines portfolio, making it an ideal choice for budget-conscious commercial and community projects without compromising performance.

Designed for on-site assembly using standard professional tools, the Power Tower is easy to transport and install. Larger stacks may require a small crane. Each tower is built from 1-metre modular sections, allowing flexible system heights and scalable output.

Modular Design & Superior Wind Capture

Power Towers feature anodised aluminium blades stacked at alternating 90-degree angles, enabling exceptional wind capture from all directions. This configuration allows the turbine to start generating at even lower wind speeds than the Flower Tulip range, while benefiting from the same internal aerodynamic advancements and patented Bouquet Effect when deployed in groups.

Standard stacks are supplied in 2, 4, 6, or 8-module configurations, with 8 modules offering the best economy of scale.

Custom stack heights of 3, 5, or 7 modules are available on request (not included in standard online packages), although balanced stacking in even multiples is recommended for most installations.

Stabilisation & Structural Requirements

• Stacks of 4 modules or more require a stabiliser pole, fitted with an upper bearing for long-term reliability

• One stabiliser pole can support up to two Power Tower stacks

• All bearings require annual inspection

Electronics & Performance Optimisation

• 6- or 8-module stacks are supplied with:

  • 5 kW electronics for low-wind areas

  • 10 kW electronics for higher-wind locations

• Generator sizing is selected based on stack height, wind conditions, and bouquet configuration

These wind turbines are around 5 meters total height. Blades are 4 meters high and 1.7 meters in diameter. They come with a generator rated at 2,000 watts, and a charge controller.

Key Features

• Modular vertical-axis wind turbine (VAWT) design

• Ultra-low cut-in wind speed

• Aluminium blades shipped flat for efficient transport

• Excellent performance in low and variable wind environments

• Scalable for standalone or bouquet installations

• One of the most cost-effective wind solutions per kW installed

Technical Specifications

General

• Model: FT AL13 Power Tower

• Turbine Type: Modular 2-Bladed Vertical Axis Wind Turbine

• Module Height: 1.0 m per section

• Recommended Configurations: 2, 4, 6, or 8 modules

• IEC Turbine Class: IEC 61400 Class IV

• Design Life: 20 years (annual inspection required)

Power & Performance

• Rated Power:

  • 1 kW (2-module stack)

  • Up to 5 kW (8-module stack)

• Expected Output per Module: ≈350 W at 12 m/s

• Bouquet Effect: ≈25% output increase per turbine when grouped and correctly oriented

• Grid-Tied Output: 120 V / 240 V

Generator & Bearings

• Generator: High-efficiency permanent magnet generator

• Available Generator Sizes: 3 kW, 5 kW, or 10 kW

• Bearings:

  • Integrated generator bearings

  • Secondary shaft bearings

  • Upper bearing required for stabiliser pole systems

Dimensions & Weight

• Blade Diameter: 1.7 m (5.58 ft)

• Module Height: 1.0 m (3.28 ft)

Total Height (Examples):

• 4 modules: ≈4.95 m (16.25 ft)

• 6 modules: ≈6.95 m (22.8 ft)

Approximate Weight (excluding generator):

• 2 modules: ≈336 kg (740 lb)

• 4 modules: ≈462 kg (1,019 lb)

• 6 modules: ≈557 kg (1,228 lb)

• 8 modules: ≈654 kg (1,442 lb)

Materials & Environment

• Blade Material: Anodised aluminium

• Base Material: A36 steel

• Cut-In Wind Speed: 0.7 m/s (1.57 mph)

• Cut-Out Wind Speed: Controlled by inverter/charge controller with electrical braking

• Mechanical Brake: Included

• Maximum Survival Wind Speed: 54 m/s (120.8 mph)

• Operating Temperature Range: −15 °C to +50 °C (5 °F to 122 °F)

Warranty

• 10-year warranty on components manufactured by Flower Turbines

• Third-party components covered by their respective manufacturers’ warranties