Strange electrical/Breaker issue (solar related??)

3 tons - MPPT controllers seek the panels maximum power point on the IV curve, ie voltage and amps or watts. This point is less than the panels Isc but at a higher voltage, hence greater watts. This maximum input power is then converted to power for the battery to charge at it's voltage and amps. The controller continually seeks this point and adjusts the output as the input changes. As the battery becomes charged the controller output is reduced as needed.

PWM controllers use Isc to charge a battery.