Using a panel that exceeds maximum amps on MPPT controller.
Discussion of solar photovoltaic systems, modules, the solar energy business, solar power production, utility-scale, commercial rooftop, residential, off-grid systems and more. but the maximum current the unit can get is 12A. Charging the RIVER Pro with an 18V 16 amp solar panel will have the same effect as using an 18V 12A solar panel