The solar front end is matched to the power group instead of forcing one PV design across every model. The 4-6.5kW units use two 18A MPPT inputs with a 150-450V operating range and 550V ceiling, while the 8-10kW group uses 22A + 22A with a 125-425V range and 500V ceiling. For an off grid solar inverter, that means string design should follow the exact model datasheet rather than assuming that every ASP 4-10kW unit accepts the same PV voltage and current. Final string calculations should therefore use the exact ASP model, not the family name alone.