Indevolt SolidFlex 2000 Solar Power System with Semi-Solid LiFePO₄ BatteriesSemi Solid LiFePO Batteries: A new standard for safety and lifespan safer, denser, and more durable. BatteryFlex Technology: Freely combine PFA and SFA expansion batteries of any capacity. Each battery delivers its full energy. In case of a fault, automatic isolation is triggered, while 0V shutdown eliminates any risk of electric shock. Flexible, efficient, and safe. Parallel Expansion: Supports free stacking operation of up to 3 groups, increasing