These clients came to us wanting to have a small amount of solar power installed with the potential to install more at a later date. We installed one SF180 solar panel with a 50A charge controller and wired the rig with 4-gauge cable from the battery bank to the roof. The 50A charge controller is powerful enough for them to install three more SF180 panels. By installing the oversized charge controller now, we eliminated the need for them to install a new charge controller (saving them some money) when they expand in the future. The roof C-Box was also installed with expansion in mind.