KOSTAL Pressebereich
Freiburg, 11.07.2019

Top position confirmed!

2019 Energy Storage Inspection: The PLENTICORE plus & BYD remain the most efficient PV storage system on the market.

Our PLENTICORE plus 5.5 in combination with the BYD Battery-Box H11.5 is ahead of the competition again in the recently-published 2019 Energy Storage Inspection. With a System Performance Index (SPI) of 91.4 %, our DC-coupled storage solution is once again best in test.

But that's not all: we also have a second system ranked among the top three most efficient storage systems: the PLENTICORE plus 5.5 with the BYD Battery-Box H6.4, which has an SPI of 90.3 %.

Why is the efficiency of storage systems so important?

As well as offering potential savings on electricity costs, efficient storage systems also contribute to climate protection. After all, reducing CO2 emissions depends largely on the efficiency of the system. Therefore, highly efficient PV storage systems can produce CO2 savings compared to a PV system without battery storage. When choosing your storage system, you should therefore consider not only the individual components, but also how the inverter and battery interact because efficient systems allow storage losses to be kept as low as possible.

It's no coincidence that two of the three best systems come from KOSTAL because we recognised the need for efficient storage systems early on. 

Time and again, KOSTAL shows how to provide fresh impetus in the sector. All our innovations aim to produce long-term customer benefits! These benefits result from our many years of experience with battery applications and a deep understanding of the systems in the field of inverters.

Frank Henn
Vice President Business Unit Photovoltaics, KOSTAL Industrie Elektrik GmbH
  • Highest system efficiency with a System Performance Index (SPI) of 91.4 %
  • Electricity cost savings of approx. €1,107 per year* as well as optimal system and acquisition costs
  • Climate-friendly thanks to lower CO2 emissions
*When using the PLENTICORE plus 5.5 with the H11.5 battery storage from BYD


What is the System Performance Index?

The study identifies the System Performance Index (SPI for short), which produces an economic value that describes how much could be saved in electricity costs a year when using the PV storage system in question.

The SPI is calculated from the real cost saving over the ideal cost saving. An ideal system with no losses whatsoever would produce an annual saving of €1,211 and would therefore have an SPI of 100 percent. KOSTAL’s highly efficient system is therefore only just over €100 shy of an ideal system under real conditions. A house consuming 5,010 kilowatt hours of power a year and fitted with a five kilowatt solar system provides the reference for the ideal system.

The SPI was conceived to allow the way in which the components (inverters/batteries/PV modules) available on the market interact in an overall system to be compared and therefore to improve transparency for the customer.

Further information can be found at www.stromspeicher-inspektion.de


Get the most efficient storage system!