Originally Posted by rbschultz
I have a 2008 Southwind with a small solar panel mounted on the air conditioner. Can I substitute a larger solar panel with same wiring?
if you understand how solar system works and you are doing it right, yes, you can!
#14 wire allows 32a when it's not bundled and not in an enclosed environment - this is called "chassis wiring". the opposite - "transmission wiring" - in a complete enclosed environment and multi wires bundled, it can pass 5.9a. in your case, i guess it's very close to the first scenario. you can connect panels in series to get a higher voltage like 48v or higher, use a mppt controller to regulate the charge. though the distance from the panels to the controller and battery plays a role, in an rv application, it's not that significant.
start with reading this Solar Tutorial Part I - Understanding the Basics of Boat & RV Solar Power | Roads Less Traveled
or other tutorials. overtime you will be able to make it.