Indevolt SolidFlex 2000 ECO (AC Version)SolidFlex 2000 ECO has no MPPT input used with the existing inverter in AC coupled operation to achieve day storage and night supply. Semi 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