The current standards (IEC 61646 and IEC 61730-2, and IEC 62804 draft for c-Si only) are clearly insufficient to guarantee satisfactory long-term stability and energy yield for thin-film modules, given that reports from the field, as well as from laboratory test results (beyond IEC testing), in some cases show significant degradation of IEC-certified modules. Accordingly, thin-film modules can also exhibit degradation effects, such as TCO corrosion and power degradation, because of potential-induced degradation (PID). This paper presents the results obtained for thin-film modules subjected to bias and damp-heat (BDH) conditions in both indoor and outdoor tests. In order to assess module lifetimes for different thin-film technologies with respect to PID, indoor- and outdoor-determined leakage currents are compared and analysed, taking into account weather data and results from accelerated ageing tests. Finally, on the basis of simulations and investigations for different installation locations, module lifetimes are estimated and discussed.
Sophia, a four-year European Commission-funded project to promote coordination across the EU's PV research community came to an end in January. With 20 partners drawn from industry and academia, the project appears to have fulfilled its aims of fostering greater collaboration. But with Europe's PV manufacturing industry facing a dire predicament in the face of competition from Asia, is it too little, too late?
Now that the PV industry has unquestionably entered a new growth phase, all eyes are on which technologies will win through into the mainstream of PV manufacturing. PERC, n-type, p-type bifacial, heterojunction – all have become familiar terms in the ever-growing constellation of solar cell technologies. The question is which will offer manufacturers what they are looking for in improving efficiencies and cutting costs.
PV deployment continues to grow at a remarkable rate. In just under 15 years it has gone from being a niche player, with a little over 1GW installed worldwide, to almost 140GW last year – more than a 10,000% increase. The technology’s onward march looks set to continue well into the future, albeit at a slightly more measured pace, with estimates forecasting as much as 430GW worldwide by 2018.
The combination of storage technology with larger scale solar projects is an emerging science. Andy Colthorpe speaks to PV power plant pioneers, Belectric, about a project completed at the end of 2014 to install battery storage at a utility-scale solar installation in Brandenburg.
The effective operation and maintenance of large PV power plants is critical to ensuring these facilities perform optimally. Sara Ver-Bruggen looks at the latest O&M technologies and strategies emerging as plant owners seek to maximise their investment returns.
Maximising production from a PV system is critical, since nearly all of the investment is made prior to system activation. Monitoring of PV systems allows operators to identify any performance or safety problems early so that they can be repaired quickly, thus minimising energy losses. Joshua Stein of Sandia National Laboratories and Mike Green of M.G. Lightning Electrical Engineering discuss some new monitoring strategies that are necessary for expeditiously identifying and locating system faults.
Project name: Jasper solar power project; Location: Near Kimberly; Northern Cape, Province, South Africa; Capacity: 96MWp; Annual Generation: 180,000MWh.
Evidence is emerging that data used in PV yield modelling, an essential element in optimising a plant’s design and profitability, is leading to erroneous results. Ben Willis reports on the solar industry’s data challenge and how it is responding.
As PV expands its global footprint, logistics – transporting goods from factory to project site – is becoming a complicated challenge for manufacturers. Sara Ver Bruggen reports on efforts by the industry to reduce costs arising from equipment damaged in transit.
