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Field Trial Results of Energy Maximizing Distributed DC Topology - Residential and Commercial Installations
H. Mann, S. Bar-Asher, A. Fishelov, A. Rosner, L. Handelsman, J. Berdner
DC-DC-Converter, Inverter, Energy Efficiency
Components for PV Systems
Subtopic: Balance of System Components
Event: 25th European Photovoltaic Solar Energy Conference and Exhibition / 5th World Conference on Photovoltaic Energy Conversion, 6-10 September 2010, Valencia, Spain
Session: 4CO.1.2
3806 - 3811
ISBN: 3-936338-26-4
Paper DOI: 10.4229/25thEUPVSEC2010-4CO.1.2
0,00 EUR
Document(s): paper


Typical photovoltaic installations suffer from numerous limitations. Many of these limitations stem from power losses – whether due to module mismatch, tilt and orientation mismatch, or partial shading. Other limitations stem from system design constraints, lack of granular monitoring and analysis abilities, and insufficient safety features. The distributed PV power harvesting and monitoring solution presented in this work introduces module-integrated electronics (PowerBox) that works in tandem with a proprietary inverter. The module-integrated electronics enable optimization of the power output from each module via module-level MPPT. The distributed system adds PV energy in real-life scenarios, provides module-level monitoring and safety mechanisms for automatic module shutdown, and overcomes design limitations of traditional inverters. This paper presents field results from comparative studies done in multiple locations around the globe. In each location, a comparison of the energy yield of two installations exposed to identical conditions is performed, wherein a traditional single inverter system is adjacent to a distributed DC system of identical layout connected to a SolarEdge inverter and with a PowerBox per module. The power outputs from both installations under various conditions are compared in order to assess potential benefits in real-life scenarios, and an analysis of the energy production gains is performed. In most cases SolarEdge systems have surpassed the energy output of the reference (traditional) systems, harvesting 3% – 14% more energy in some of the sites.