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Efficiency and Effectiveness of PV Battery Energy Storage Systems for Residential Applications - Experience from Laboratory Tests of Commercial Products
C. Messner, J. Kathan, C. Seitl, S. Hofmüller, R. Bründlinger
Performance, Efficiency, PV Battery Home Storage System
PV Applications and Integration
Subtopic: Grid and Energy System Integration
Event: 32nd European Photovoltaic Solar Energy Conference and Exhibition
Session: 6CO.12.1
2386 - 2397
ISBN: 3-936338-41-8
Paper DOI: 10.4229/EUPVSEC20162016-6CO.12.1
0,00 EUR
Document(s): paper, presentation


Decreasing feed-in tariffs, diminishing PV system costs and , simultaneously rising electricity prices provide best conditions for the use of photovoltaic battery energy storage system (PV-BESS) for residential application. System profitability depends on its ability to cover the electricity demand with the local generation provided. Apart from the sizing of the system, the performance of the power conversion system (PCS) and the control algorithm have a fundamental impact on the effectiveness of the system. Additionally missing standards for the determination of the efficiency of BESS prevent transparent and comparable evaluations for the customer. To fill this gap a number of institutes are developing specific laboratory test procedures which enable a qualitative and quantitative evaluation of the performance of residential PV-BESS. First test results with a set of commercial products in the AIT SmartEST laboratory revealed a discrepancy of overall efficiency numbers between the tests and the datasheet. Particularly at low load e.g. during the night – despite the high efficiency of the used lithium-ion batteries – low efficiency values are measured. In addition, the behaviour of the control system is strongly affected by the used metering device.