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Bulgaria-based AuroraCell has introduced a 9.744 kWh residential battery that uses sodium-ion chromium oxide (NCO) chemistry and is designed for 48 V hybrid inverters. The company claims up to 20,000 cycles at 100% depth of discharge and offers a 20-year warranty, but independent performance data and details behind its safety claims were not provided in the report.
Bulgaria-based AuroraCell has launched a 9.744 kWh residential battery using sodium-ion chromium oxide (NCO) chemistry, a product aimed at homes using compatible 48 V hybrid inverters. The company claims the battery can reach 20,000 cycles at 100% depth of discharge and backs it with a 20-year warranty; those figures are manufacturer claims, not independently verified results in the published report.
The product, named the AuroraCell 9.7 kWh – 48 V RESS Pack, is a standalone battery with a nominal voltage of 46.4 V and a nominal capacity of 210 amp-hours. Its specified operating voltage range is 32 V to 54.4 V. AuroraCell lists standard and maximum charge rates of 0.5C and a standard discharge rate of 0.5C. The maximum discharge current is 150 amps within a stated temperature range of 0 C to 60 C.
The manufacturer says the NCO cells can deliver 20,000 cycles at 100% depth of discharge at 25 C. Charging is specified between 0 C and 60 C, while the stated discharge temperature range is broader, from -40 C to 60 C. The report does not provide test protocols, independent validation, or an estimate of how those cycle-life figures translate into years of service under typical household use.
The battery weighs 110.5 kg and measures 483 mm by 254 mm by 754 mm. It has an IP65 rating and supports parallel connections, which AuroraCell says allow installers to add capacity. The company lists compatibility with hybrid inverter platforms from Victron Energy, Deye, Solis, Growatt, Schneider Electric, SMA, Sungrow, Sofar Solar, Studer and Ingeteam; it says other brands may be supported on request. Its technical literature lists UL9540A, UN38.3, MSDS and CE, though the report does not specify the scope or status of each listing.
A Different Chemistry for Home Storage
The launch adds a sodium-ion option to the residential storage market, where buyers often compare systems by usable capacity, safety, operating temperatures, expected service life, inverter compatibility and warranty. AuroraCell is positioning its NCO chemistry around long cycle life and temperature tolerance, rather than presenting the product only as a capacity addition. These specifications may interest households and installers looking at stationary storage, where batteries are expected to charge and discharge repeatedly over many years.
Claims of 20,000 cycles and a 20-year warranty are meaningful points for prospective buyers, but they do not by themselves establish the battery’s cost-effectiveness or performance in a home installation. The report gives no price, usable-energy figure, round-trip efficiency, warranty conditions, or market-availability details. Those factors will shape whether the pack is a practical alternative to other residential batteries, as will confirmed compatibility with a particular inverter and the installer’s system design.
The stated 48 V architecture and parallel support also define the product’s likely fit: it is designed to join compatible systems, not to serve as a universal replacement battery. Homeowners would need to check inverter communication requirements, charging limits, installation conditions and local electrical rules with a qualified installer before selecting it.
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How AuroraCell Describes NCO Chemistry
Sodium-ion batteries move sodium ions through a cell during charging and discharging. AuroraCell’s product uses a chromium oxide cathode, described in the report as sodium-ion NCO chemistry. The Energy Storage report says the cathode chemistry differs from standard sodium-ion designs and is intended to improve battery life, stability and performance across a wider temperature range. Those benefits are the company’s product rationale; the report does not include comparative test results against other sodium-ion or lithium-based batteries.
AuroraCell says the chemistry is intended to address commonly cited trade-offs for sodium-ion batteries, including lower energy density and constraints at temperature extremes, by prioritizing cycle life, thermal stability and operating range. The launch announcement supplies product specifications but no independent study or field data establishing how the NCO pack performs in those areas. The distinction matters because laboratory cycle counts, temperature limits and real-world household performance can vary with operating conditions and system controls.
“The company describes the battery’s sodium-ion NCO architecture as an “ultra-safe design” with “no fire and explosion.””
— AuroraCell, as quoted in the Energy Storage report
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Performance Claims Need More Detail
The announcement, as summarized by Energy Storage, does not disclose the battery’s price, launch markets, delivery schedule, usable capacity, round-trip efficiency, or warranty exclusions. It also does not explain whether the 20,000-cycle claim reflects a particular test standard, capacity-retention threshold, or operating profile. Without those details, buyers cannot directly compare the headline cycle count with competitors’ specifications or estimate lifetime cost.
AuroraCell’s statements about safety and improved performance are not accompanied in the report by supporting test results. Although the company’s technical literature lists UL9540A, UN38.3, MSDS and CE, the report does not clarify which certifications apply to the complete battery system, what testing was conducted, or whether all documentation is available for review. The scope of its inverter compatibility claims and the conditions of the 20-year warranty also remain unspecified.
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Pricing and Certification Details Awaited
The next useful information for customers and installers would be pricing, availability and warranty terms, together with a complete datasheet and installation documentation. Independent test results on cycle life, capacity retention, thermal behavior and safety would help establish how the manufacturer’s claims compare with performance in other residential storage systems.
Before specifying the pack, installers and prospective buyers will need to confirm that the relevant inverter model and firmware are supported and that the system meets local electrical and installation requirements. AuroraCell’s announcement does not give a timeline for broader market availability or identify a next product milestone.
home battery backup system for hybrid inverter
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Key Questions
What did AuroraCell launch?
AuroraCell launched the 9.7 kWh – 48 V RESS Pack, a residential battery with 9.744 kWh of rated energy based on sodium-ion NCO chemistry.
How many cycles does the battery claim to support?
AuroraCell claims the cells can achieve 20,000 cycles at 100% depth of discharge at 25 C. The published report does not provide independent verification or details of the test protocol.
Which inverters is the battery compatible with?
AuroraCell lists hybrid inverter platforms from Victron Energy, Deye, Solis, Growatt, Schneider Electric, SMA, Sungrow, Sofar Solar, Studer and Ingeteam. It says additional brands may be supported on request, so compatibility should be confirmed for the exact model.
What is known about the warranty and price?
The company offers a 20-year warranty, but the report does not state its terms, exclusions or conditions. No price or availability details are provided.
Are the battery’s safety claims independently confirmed?
Not in the published report. AuroraCell describes the design as “no fire and explosion” and lists several certifications in its technical literature, but the report gives no supporting test results or detail about the scope of those certifications.
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