EN 
PT_BR 
HTW Berlin (Berlin University of Applied Sciences) has released its latest electricity storage test. The inspection compared the energy efficiency of photovoltaic storage systems for homes.
In this latest edition, 21 systems were examined. The energy efficiency of home storage systems was evaluated using the SPI (System Performance Index).
According to the study, the two hybrid inverters GoodWe ET and GoodWe EH, with BYD batteries, obtained an SPI of 93.4% and 91.2%, respectively.
In total, 14 storage system providers accepted the invitation to participate in the electricity storage inspection.
According to HTW Berlin, participating manufacturers received the anonymous results of the storage comparison in advance. After analyzing the test results, 12 companies chose to be named in the study.
Brazil can learn from Germany
The study also highlighted the positive development of the photovoltaic storage systems market in Germany, something that can serve as a lesson for the Brazilian solar energy market.
While in 2019 only around 37% of new photovoltaic systems were combined with storage, in 2021 this number rose to 56%. Just to give you an idea, last year alone more than 130,000 energy storage units were installed or adapted in conjunction with a photovoltaic system. In 2019, there were only 41 thousand.
These numbers point to the potential of Brazil, which today has more than 948 thousand photovoltaic systems connected to the grid, according to data from ANEEL (National Electric Energy Agency).
This is because, recently, the INMETRO (National Institute of Metrology, Quality and Technology) published Ordinance 140/2022, regulating the use of hybrid inverters and lithium batteries in the country.
“Our survey carried out in 2021 showed that 96% of those interviewed support the use of batteries connected to a photovoltaic system. Among end users, 90% would like to have this type of solution in the next 2 to 3 years”, says Silvio Robusti, South America Marketing Manager at GoodWe.
History of HTW Berlin
Since 2018, the research group for solar storage systems at HTW Berlin has examined more than 60 AC and DC coupled solar energy storage systems.
