KOSTAL Pressebereich
Freiburg, 11.07.2019

Top position confirmed!

Energy Storage Inspection 2019: PLENTICORE plus & BYD continue to be the most efficient PV storage system on the market.

Our PLENTICORE plus 5.5 in combination with the BYD Battery-Box H11.5 is again ahead of the field in the recently published energy storage inspection 2019. With a System Performance Index (SPI) of 91.4%, our DC-coupled storage solution is test winner again.

But that's not all: we also have a second system among the TOP 3 of the most efficient storage systems - the PLENTICORE plus 5.5 with BYD Battery-Box H6.4 - with an SPI of 90.3%.

Why is the efficiency of storage systems so important?

In addition to the savings potential in electricity costs, efficient storage systems also make their contribution to climate protection. After all, the reduction of CO2 emissions depends to a large extent on the efficiency of the system. For example, highly efficient PV storage systems can show CO2 savings compared to a PV system without battery storage. When choosing your storage system, you should therefore pay attention not only to the individual components, but also to the interaction between inverter and battery. Efficient systems can keep storage losses as low as possible.

It is no coincidence that two of the best three systems come from KOSTAL, because we recognised the need for efficient storage systems at an early stage. 

KOSTAL has always been able to set new impulses in the industry. The goal of all our innovations is to generate sustainable customer benefits! This benefit results from our many years of experience in the field of inverters with battery applications and a deep understanding of the system.

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 Euro per year* as well as optimum system and acquisition costs
  • Climate-friendly thanks to reduction of CO2 emissions
*When using the PLENTICORE plus 5.5 with the battery storage H11.5 from BYD


The System Perfomance Index - What is it?

The study determines the System Performance Index (SPI). This provides an economic value that describes the possible reduction in electricity costs per year by using the considered PV storage system.

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 shy of €100 off an ideal system under real conditions. A house consuming 5,010 kilowatt hours of electricity 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.

For more information please have a look at www.stromspeicher-inspektion.de


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