The inverter can accept PV solar inputs to both MPPT channels and AC coupled solar input at the same time. The AC coupled solar input can be up to 90A of AC power or 21.6kW of solar. The MPPT channels can handle up to 18kW of solar, with 12kW available for back feeding the utility grid. Therefore, up to 33.6kW of AC power could be sent back to the grid. For this amount of back feed, users will need either a feeder tap or supply side tap as the point of utility interconnection. (See Diagrams 4.3 and 4.4 for more information) The existing solar system is connected to the inverter's GEN terminal. For AC Coupling wiring configuration, see Diagram 4.9.