This relatively simple installation involved 200W of solar through a PWM charge controller onto two AGM batteries. We added a 150W inverter for device charging along with a 12V/USB outlet.
This customer came to us with a price ceiling and asked that we give them the most power possible for their budget goal. Upon inspecting the trailer, we found that their batteries were completely dead. We replaced them with a pair of low cost Interstate Flooded batteries and added two 100W panels to the roof with a 25A SunRunner Signature MPPT core. The system can easily be expanded with the addition of two more 100W panels when the customer is ready.
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.