AC block

AC block
Other namesAC block container
Alternating current block
TypeEnergy storage device
IndustryEnergy storage
Inception2022[1]
DefinitionIntegration of battery racks and string PCS into one container[2]

An AC block, whose full name is alternating current block,[3] also known as AC block container,[4] is a container that integrates power conversion systems (PCSs) with batteries.[5] First introduced in 2022,[6] these devices are mainly used in the energy storage industry. AC block products are mainly composed of PCSs, thermal management and other components, as well as cabling.[7] It is seen as an alternative to the DC block container.

Currently, the number of companies that manufacture AC blocks is limited.[6] The main manufacturers of such products include Sungrow,[8] NV Energy,[9] Fluence,[10] and Wärtsilä.[11] Although this product type was not introduced until 2022, this emerging product design is gaining increasing popularity in the battery energy storage industry.[12]

Compared to DC block containers

Compared to DC block containers, AC block containers reduce space requirements,[13] providing better reliability,[14] and easier installation.[15] However, in the short term, AC ones will come at a cost premium. In the long run, the advantages of AC block products may drive down the overall system costs.[6]

History

The first AC block product was launched in 2022.[16] In October 2023, another product in the same category was made available by Sungrow. In 2024, Wärtsilä released an AC block BESS called Quantum 3.[17]

In early 2025, Sungrow introduced the "AC block based on triple-E integration" concept,[18] where "triple-E" refers to power electronics, electrochemistry, and electrical grids. In June, the company rolled out the PowerTitan 3.0,[19] which was built upon this specific concept.[18]

Manufacturers

According to a research report published by S&P Global Commodity Insights, as of November 2023, the manufacturers that produce AC blocks were very limited.[6] Sungrow Power Supply and Rimac Energy were included in this report.[6]

References

  1. ^ "Fluence Energy launches its AC block energy storage system". EE Times. February 17, 2025.{{cite web}}: CS1 maint: deprecated archival service (link)
  2. ^ "Top 5 global inverter trends to watch in 2025". S&P Global. January 29, 2025.{{cite web}}: CS1 maint: deprecated archival service (link)
  3. ^ Cameron Murray (November 13, 2024). "Ease of installation and better availability to drive shift to AC block solutions". Energy Storage News.{{cite web}}: CS1 maint: deprecated archival service (link)
  4. ^ Marija Maisch (March 19, 2024). "Next-gen battery trends". PV Magazine. Archived from the original on September 13, 2025.
  5. ^ Ameya Paleja (September 16, 2024). "Quantum 3: Wärtsilä unveils smart container-like grid-level energy storage system". Interesting Engineering.{{cite web}}: CS1 maint: deprecated archival service (link)
  6. ^ a b c d e Anqi Shi; George Hilton (November 21, 2023). "Will AC blocks become the standard product offering for energy storage systems?". S&P Global.{{cite web}}: CS1 maint: deprecated archival service (link)
  7. ^ Andy Colthorpe (October 22, 2025). "'Developers don't want geopolitical risks': Fluence talks up US domestic content strategy". Energy Storage News.{{cite web}}: CS1 maint: deprecated archival service (link)
  8. ^ "Sungrow Launches New Solar and Energy Storage Products at RE+ 2025". Financial Times. September 10, 2025.{{cite web}}: CS1 maint: deprecated archival service (link)
  9. ^ David Wagman (December 12, 2022). "NV Energy to add BESS as it works to trim reliance on western energy markets". Renewable Energy World.{{cite web}}: CS1 maint: deprecated archival service (link)
  10. ^ Andy Colthorpe (February 14, 2025). "Fluence launches AC block BESS solution with 'industry-leading' energy density". Energy Storage News.{{cite web}}: CS1 maint: deprecated archival service (link)
  11. ^ Cameron Murray (April 1, 2025). "Wärtsilä on design, mitigation and new tech for quietening BESS". Energy Storage News.{{cite web}}: CS1 maint: deprecated archival service (link)
  12. ^ Cameron Murray (November 26, 2024). "The evolving dynamics of the energy storage system integrator landscape". Energy Storage News.{{cite web}}: CS1 maint: deprecated archival service (link)
  13. ^ Veselina Petrova (July 16, 2025). "Battery maker IPS launches Bulgaria's first Net-zero strategic project". Renewablesnow.com.{{cite web}}: CS1 maint: deprecated archival service (link)
  14. ^ Cameron Murray (December 3, 2024). "Minimising the role of EPCs in BESS and the 'shocking' cost of US manufacturing". Energy Storage News. Retrieved November 9, 2025.{{cite web}}: CS1 maint: deprecated archival service (link)
  15. ^ Andy Colthorpe (April 17, 2025). "AC blocks continue to grow in popularity". Energy Storage News.{{cite web}}: CS1 maint: deprecated archival service (link)
  16. ^ Marija Maisch (February 19, 2025). "Fluence launches highly-modular 7.5 MWh AC-based BESS platform". PV Magazine. Archived from the original on June 19, 2025.
  17. ^ Jo Borrás (September 15, 2024). "Wärtsilä makes a quantum leap with Quantum 3 utility scale BESS". Electrek.{{cite web}}: CS1 maint: deprecated archival service (link)
  18. ^ a b "Sungrow introduces its PowerTitan 3.0 smart storage platform". Ta Kung Pao. December 12, 2025.{{cite web}}: CS1 maint: deprecated archival service (link)
  19. ^ Cameron Murray (June 11, 2025). "Sungrow launches PowerTitan 3.0 with modular design". Energy Storage News.{{cite web}}: CS1 maint: deprecated archival service (link)

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