Power & Energy Solutions

The premier renewable energy publication

The cleaning of sensitive surfaces is a challenge. And according to Serbot AG, many operators 
of solar panel installations give away their profits because they are unaware of the effect that dirt has on their installations. PES investigates the Swiss company's innovative, robotic solutions.Certainly, the surfaces on PV installations often still look good, but the performance loss amounts to 10%, and that clearly should not be the case. Serbot AG develops automated cleaning concepts for medium and large installations. The company's innovative solutions can also be used for cleaning glass facades on buildings.No personnel on the roofTypically, solar panels on rooftops or glass facades of buildings are cleaned manually. This is often accompanied by significant safety risks for the cleaning staff. However, these risks could be avoided with automated systems.Serbot AG's solutions are based on robots that attach themselves to smooth surfaces via suction. The suction cups of these robots are mounted on a kind of gear ring, so that they can be moved and give the robot the freedom to move on the surface in any direction.A robot is used for cleaning solar panel installations on house and barn roofs that can operate a brush up to a width

Read More

Having built over 20 years' experience in the Oil & Gas industry, Seaway Heavy Lifting turned its extensive expertise to renewables - particularly wind energy. The offshore contractor has already gained a reputation for excellence and an impressive track record. We take a look at its project highlights.SylWin alpha PlatformTransportation and installation of the SylWin alpha Platform. Under the direction of Seaway Heavy Lifting, one of the world's largest convertor platforms was installed to the west of Sylt, the East Frisian Island.The platform was so large and heavy that the ingenious ‘float-over method' was used to lift it from a pontoon on to the already installed jacket. This approach had been used successfully in the Gulf of Mexico and in the Far East, but this was the first time that a platform this size was installed using the method in the North Sea.Siemens commissioned Seaway Heavy Lifting to perform the unusual operation, and in turn called in the assistance of two other Dutch maritime service providers. The 14,000Mt SylWin alpha Platform topside was transported on a pontoon that had been positioned in between the jacket legs.The platform topside was installed on to the legs of the jacket by ballasting the

Read More

Founded in 1937, KNUD E. HANSEN A/S has both experienced and been at the forefront of many of the dramatic changes in commercial ship design and has made its mark on over 15,000 vessels. We take a look at the company offerings and discover how it became a key provider in today's wind industry.The marine industry in general, and shipbuilding in particular, tends to be rather conservative businesses and for good reason; the sea can be a dangerous place and proven solutions provide confidence and predictability. However, with advances continually being made across all the technologies that underpin the sector, being too conservative can also block vital innovation.When developing new projects, KNUD E. HANSEN starts with a blank sheet of paper, considering all the possible solutions. Existing designs and technologies are re-evaluated, but in parallel with that a completely fresh approach is also taken; evaluating new and emerging technologies and assessing their potential in the context of each project.The company also studies existing systems and techniques to see if they can be applied in new ways. Ultimately, the design teams consider every possibility however innovative or traditional, with the objective of ensuring that the final proposal best fulfils the needs

Read More

SiOxNy layers serve different functions in coated layer stacks including: diffusion barrier, scratch protection, and refractive index tuning. We report on the increase of coating process stability and layer quality of SiOxNy deposited on large areas using reactive MF dual magnetron sputtering with 1.6m long cathodes oriented in a vertical geometry.The process has been monitored using SOLAYER's 'SOL.rpc' process control unit to detect the reactive species in situ and to provide an indirect indication of the level of target poisoning.The effectiveness of the feedback control is evaluated in different modes such as target voltage and optical emission intensity signal tracking during reactive magnetron sputtering. These tests are carried out for different layer compositions and recipes using the in-line 'V1600' coater and process control unit 'Sol.rpc'.IntroductionThe deposition of SiOxNy via reactive sputtering is commonly employed in large area coating applications. SiOxNy layers serve different functions in coated layer stacks including: diffusion barrier, scratch protection, and refractive index tuning. Especially in PV thin film applications, SiON layers are used as a barrier layer between glass and the Mo back contact in CIGS technology, or in superstrate technologies to protect the front contact TCO layer from diffusion of sodium from the glass substrate.In our

Read More

A trusted name in the solar industry for decades - Spitzenberger & Spies GmbH & Co. KG. - remains ahead of the rest when it comes to the capabilities of modern bi-directional inverters. In this article, we explore the use of battery energy storage systems in local PV installations and testing the performance of connected solar inverters.The longstanding problem when using photovoltaic energy harvesting is the night, when no energy production is available. Yet, several ways are currently being discussed to supply energy even during night-time with renewable energy.One possibility for avoiding the nightly energy gap is an energy storage system. Centralized storage systems are already on the market, and are mainly driven by the power generating and distributing industry. For those solutions storage media like heat, gas, air and water are used. For smaller and decentralized installations like family houses new battery based storage systems are entering the market.The functional idea behind a battery energy storage system is shown in Fig. 1 (opposite).In this idea the solar inverter acts as a bi-directional gateway between the local installation and the public grid. A battery energy storage system is optimally connected to the PV installation on the DC side of the

Read More