SolarWorld’s ‘Sunmodule Bisun’ system boosts free-field and flat roof power generation

Facebook
Twitter
LinkedIn
Reddit
Email
Sunfix Bisun can be attached to flat roofs with a roof-tilt of up to five degrees. It is suitable for various rooftop covers such as bitumen, gravel, foil or green roofs. Image: SolarWorld

SolarWorld has launched a new era of modules for free-field and flat roof systems. The new ‘Sunmodule Bisun’ is a solar module active on both sides (bifacial) that converts light from all directions into electrical energy. This ensures up to 25 % more yield per installed kWp, depending on the surface on which it is installed. The modules are expected to be provided in 270Wp through 331Wp configurations. SolarWorld has also developed a new racking system for flat roofs that is optimized for the bifacial technology.

Problem

This article requires Premium SubscriptionBasic (FREE) Subscription

Try Premium for just $1

  • Full premium access for the first month at only $1
  • Converts to an annual rate after 30 days unless cancelled
  • Cancel anytime during the trial period

Premium Benefits

  • Expert industry analysis and interviews
  • Digital access to PV Tech Power journal
  • Exclusive event discounts

Or get the full Premium subscription right away

Or continue reading this article for free

Growing demand for high-performance and high yielding PV modules to reduce installation costs through fewer modules and BOS (Balance of System) requirements do not always maximize available space as conventional modules cannot take advantage of reflected light from a roof or ground surface to provide higher performance. 

Solution

The duo cells used in this module contribute to power generation through their active rear side. The double-sided light utilization, the so-called bifaciality, is based on the further development of PERC (Passivated Emitter Rear Cell) technology. If the solar module is used on surfaces such as light-coloured concrete or white membrane, more light is reflected into the module and the energy yield increases further. The brighter the surface, the higher the output generated. However, the bifacial module also produces more output than comparable standard modules on non-optimized surfaces such as grass, sand or trapezoidal sheeting. The Sunmodule Bisun also has a long lifespan through the use of glass on the front and rear sides of the module. This glass/glass technology also ensures high mechanical durability and improved degradation behavior and has a 30-year linear performance guarantee, with at least 86.85 % output after 30 years. 

Applications

Ground-mounted systems and flat roofs.

Platform

‘Sunfix Bisun’ mounts the module at a distance of 30 cm to the roof surface optimizing light capture for energy harvest. The increased elevation ensures optimized energy harvest without sacrificing the performance of the racking system. The racking system consists of five pre-assembled components (3 legs adjusted to a module tilt of 10°, ballast tray, and, cable routing) and can be installed using only one tool. It is fixed to the roof through ballast. Roof bolts can be integrated into the system if required. The legs are made of sturdy, weather-resistant material of stainless steel and aluminum. The system does not need long rails – the longest part of the system is only 80cm long. This means it is easy to transport and needs little storage space. Sunfix Bisun can be attached to flat roofs with a roof-tilt of up to five degrees. It is suitable for various rooftop covers such as bitumen, gravel, foil or green roofs. The module and racking system are available immediately.

Availability

June 2016 onwards.

Read Next

Premium
September 4, 2025
Analysis: A Biden-era policy to suspend the payment of duties on Southeast Asian module imports looks set to backfire badly on an already under-pressure US solar industry.
September 4, 2025
ARENA has launched the second funding round of its AU$1 billion Solar Sunshot programme, making AU$150 million available.
September 1, 2025
Solar Organic Centro España is planning to build a 10GW solar module and battery manufacturing facility in the Spanish autonomous community of Castilla-La Mancha.
Premium
August 28, 2025
US solar companies could potentially pay “tens of billions” of dollars in retroactive duties on products imported from Southeast Asia between June 2022 and June 2024, following a decision from the US Court of International Trade (CIT).
August 27, 2025
Long-term procurement decisions from the US solar industry could support US solar manufacturing, regardless of changes to federal tax credits, PV Tech has heard.
Premium
August 27, 2025
American Clean Power Association’s MJ Shiao assesses the state of US PV manufacturing in the wake of recent policy developments.

Subscribe to Newsletter

Upcoming Events

Solar Media Events
September 16, 2025
Athens, Greece
Solar Media Events
September 30, 2025
Seattle, USA
Solar Media Events
October 1, 2025
London, UK
Solar Media Events
October 2, 2025
London,UK
Solar Media Events
October 7, 2025
Manila, Philippines