OutBack Power FLEXmax FM100-300VDC-AFCI Charge Controller - The FLEXmax 100-300VDC-AFCI is the latest innovation in Maximum Power Point Tracking (MPPT) charge controllers from OutBack Power. It is a top-of-the-line high performance, efficient and versatile charge controller for your advanced power system. The FLEXmax 100-300VDC-AFCI delivers both higher voltage and higher power, offering improved flexibility and performance. 100A output for up to 6kW