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News

Rimac unveils 'most technically advanced BESS in the world',
SineStack

By Cameron Murray
September 27, 2023
Europe
Grid Scale, Connected Technologies, Distributed
Products, Materials & Production, Technology
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energy storage summit central eastern europe cee rimac One of Rimac's
slides shown during its presentation at Energy Storage Summit Central
Eastern Europe (CEE). Image: Cameron Murray / Solar Media.

Rimac Energy, the battery energy storage system (BESS) division of EV
supercar company Rimac Automobili, has unveiled its new product at
the Energy Storage Summit Central Eastern Europe (CEE).

Roger Moorhouse, product engineering manager for Rimac's engineering,
development and production arm Rimac Technology, gave
never-before-revealed details on its BESS solution in a presentation
on Day 1 of the two-day event. Details have been eagerly anticipated
since the company announced it was going into stationary energy
storage back in May.

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The unit, called SineStack, is a lithium iron phosphate (LFP)
cell-based modular BESS solution with an energy storage capacity of
790kWh and a 400kVa output.

The product's core differentiating feature is its distributed
inverter topology architecture, sometimes called an "AC battery",
where the inverter capability is distributed amongst all of the
modules giving independent control over every 18 cells.

"That means more granular balancing, more redundancy, more energy
extracted, longer lifetime, and all of that control to really make it
a software-defined product," Moorhouse said.

Furthermore, he claimed the BESS would have the best cycle life in
the lithium-ion BESS industry at 12,000 cycles, the highest AC
round-trip efficiency at over 92%, and the best energy density at
280kWh per square metre.

Addressing the audience, Moorhouse later said: "If you're asking how
we can achieve this, it really comes back to the point that we are
vertically integrated across the whole system, there is virtually no
boundary between the battery and the inverter, it's highly integrated
with reduced filtering requirements, which allows us to get the best
footprint (energy density) in the industry."

Rimac plans to start producing its BESS at mass scale from a new
facility near Zagreb, Croatia, with an annual production capacity of
300MWh starting in 2025, rising to 1GWh a year later and 10GWh-plus
further down the line.

rimac sinestackA visualisation from Rimac showing the benefits of the
BESS' design. Image: Cameron Murray / Solar Media.
croatia, energy density, europe, footprint, high energy density,
inverters, lfp, lithium iron phosphate, manufacturing, modular, new
products, production, round trip efficiency, storagecee,
StorageSummitCEE

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