Unigrid has launched Na+Casa, a sodium-ion residential energy storage system using its proprietary NaCrO₂ cathode technology, claiming a 10,000-cycle lifespan, wide temperature tolerance, and improved safety compared with lithium-ion batteries. The 9.25 kWh wall-mountable system has begun initial European installations, with US launch planned for 2026.
California-based sodium-ion battery developer Unigrid has launched Na+Casa, its first residential energy storage system, and said it has completed initial installations in homes across Europe.
The Na+Casa system uses battery cells featuring the company’s proprietary sodium chromium oxide (NaCrO₂, or NCO) cathode technology. Unigrid claims the chemistry enables a long operational lifespan and eliminates the fire risk associated with conventional lithium-ion batteries.
According to the company, the Na+Casa battery is rated for 10,000 full charge-discharge cycles at 100% depth of discharge, equivalent to daily cycling for more than 27 years. Some of Unigrid’s commercial battery products are rated for more than 30,000 cycles.
The company also highlights the system’s broad operating temperature range. The battery can reportedly charge at temperatures from -20 C to 60 C and discharge between -40 C and 60 C.
