Solar power business is expanding rapidly in Japan because new feed-in tariff began in July 2012. Generally, monitoring for defect detection and total electric generating capacity is done at power conditioning system (PCS) in large scale photovoltaic (PV) power plant. Although PCS monitoring can detect its own defection or reduction in power generation amount, it is difficult to monitor by PV string/panel base. Additionally, it was also difficult to apply traditional monitoring method in PV string/panel to existing large PV power plant because special joint boxes with wired communication unit were used for its installation. New PV string monitoring method which is easy to install to both existing and new PV power plants is proposed in this paper. This proposed method realizes efficient data capturing by fixed unit-to-portable unit and multiple fixed-to-fixed units wireless communication utilizing DECT (Digital Enhanced Cordless Telecommunications). Finally, the effectiveness of this proposed method is shown in the demonstration experiments using actual F Onomichi power plant.
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