In the study, independent testing authorities
tested the overall efficiency of 21 home storage systems and analysed how the
PV systems and battery storage systems from the 14 participating manufacturers
perform in combination. The study underlines the importance of the energy
efficiency of the solar power storage units and notes:
“In a less efficient system that was tested, nearly 1,100 kilowatt
hours are lost annually due to high conversion losses - 600 kilowatt hours more
than the winner from Fronius.”
The study calculates overall efficiency using
the System Performance Index, or SPI. Two different reference cases were used
for the assessment: One reference system combined a 10 kWp PV system with heat
pump and electric car and assumes an average annual household consumption of
5,010 kWh/a. The second, more streamlined reference case analysed the SPI for a
5 kWp PV system with the same annual household consumption as in the 10 kWp
scenario.
In the 10 kWp category, the combination of the
Fronius GEN24 10.0 Plus hybrid inverter and the BYD Battery Box H11.5 performed
extremely well and achieved a never before seen SPI value of 94%. It was the
only combination in energy efficiency class A to secure first place and left
the other systems trailing by a country mile. This duo also achieved excellent
results in the 5 kWp class, scoring 92.3% - close behind the winner in second
place. These two systems were the only ones to achieve energy efficiency class
A in this category.
Maximum conversion efficiency
The Fronius BYD combination demonstrated outstanding values in the
energy conversion paths examined. These values illustrate the conversion
efficiency of the PV energy produced to loads, to batteries, from the battery
to loads or from the grid to the battery. Here, the hybrid inverter GEN24 Plus
skilfully plays on one of its strengths, integrated Multi Flow Technology. This
not only enables simultaneous energy flows in all directions, but also the AC
and DC coupling of the battery storage system. In the test, the Fronius Symo
GEN24 Plus inverter achieved the highest efficiency for all energy flows in
comparison with the other systems.
Fronius GEN 24 Plus compatible with new BYD Battery-Box
Premium
The new GEN24 Plus hybrid inverter will be available from September 2020
1
as both a
three-phase Symo GEN24 Plus with power categories from 6 to 10 kW and in 2021 as a
single-phase Primo GEN24 Plus from 3 to 6 kW. It is a uniquely versatile all-in-one solution for comprehensive solar
self-sufficiency and ensures maximum independence with integrated grid back-up
options. When submitted for the Energy Storage
Inspection 2020, it was tested again in combination with the BYD Battery-Box
H11.5, available at the time. As of market availability, the GEN24 Plus is only
compatible with the new, improved BYD Battery Box Premium HVS and HVM.
More about the study:
www.stromspeicher-inspektion.de
1Depending on country-specific availability