The 12.8V product uses a maximum charging voltage of 14.4V, while the 25.6V products use 28.8V. That difference follows the battery voltage class and is one reason the same charger or inverter setting cannot simply be assumed for every SF model. In a solar energy storage project, the inverter or charger must be configured for the exact battery voltage and its BMS requirements before the system is energized. Settings must match the exact battery voltage before commissioning.