This rig came to us with two functioning 65W panels and a low-end charge controller. They wanted more power. We added two of our 100W solar panels and combined them all in a roof mount c-box. Instead of penetrating the roof under the c-box, we routed the cables down the refrigerator vent. Because of the two different panel types, with different voltages, we went with a PWM replacement charge controller and added a battery monitor. (MPPT controllers don’t do well with mixed panels). We also added a USB outlet for portable device charging.