Clipping in the Red

When I run System Sizing with a 710w module and then run again with a 730w module, same database Inverter the MPPT clipping goes into the RED with the 710w module.

I thought that if the modules output (730w) is more than the Inverters rated input only then the clipping would go to the RED.  But in this case the lower wattage (710w) module cases the high clipping and changing the quantities of the Inverters up/down doesn't eliminate the high clipping.

What am I not understanding here??

Hello,

The PV System Sizing macro shows estimated power losses for inverter power limiting and MPPT voltage clipping.

Power limiting is determined by the array power output and the inverter's AC capacity: The inverter limits its AC power output to the nameplate capacity.

Voltage clipping is determined by the array operating DC voltage and the minimum and maximum MPPT voltage rating: The array DC operating voltage is clipped to the maximum (or minimum) MPPT voltage.

The results you describe suggest that the 710 Watt module operates at a higher DC voltage, or that the number of modules per string for the 710 Watt module is higher than for the 730 Watt module.

Best regards,
Paul.

Thanks!