The Energy Storage Inspection 2023 analyzed and compared the energy efficiency of 18 battery systems. With an average inverter efficiency in discharge mode of 97.8 % and a settling time of less than 0.2 s, new records were set. In the reference case up to 5 kW the hybrid inverters F1 and C1 scored best with an SPI (5 kW) of 92.6 %.
Laboratory tests were conducted by independent testing institutes in accordance with the "Efficiency Guideline for PV Storage Systems” (version 2.0). To each analyzed system a system abbreviation (e.g. A1) was assigned. The batteries of the AC-coupled systems A1 to B2 are equipped with battery inverters.
For the sixth time in a row all manufacturers of solar energy storage systems for residential buildings were invited to take part in the Energy Storage Inspection 2023. 11 manufactures participated in the comparison of the storage systems with measurement data of 18 systems. Two manufacturers decided to participate anonymously.
Electricity infrastructure shall be inspected to verify whether they comply with Environmental requirements as per“ The Environmental Impact Assessment and Audit Regulations 2005 “ and “Environmental Management Act , 2004 “ .
In DC-coupled systems, the so-called PV rated output power limits the power output of the PV-storage system. The manufacturer of the system I2 specifies a output of 10 kW on the data sheet. However, in the laboratory test only a output power of 7,8 kW could be measured.
EWURA may make use of investigation report carried out by other relevant authorities as a reference to its main investigation report. Consumer complaints that require an investigation shall be conducted in collaboration with appropriate personnel from the utility company who is conversant with the matter.