Should a off-grid wind charge controller be UL certified?
Not all products can be or have to be, listed. For some products there are no applicable UL standards; for others, the products simply aren’t safe enough to ever be listed. like vinyl dryer hose.

Your Risks are your own;
- tornado and hurricane safety protection &amp; tower/foundation installation.
- Lightning ground rod installation
- Battery overcharge verification testing
- design verification tests after installation (commissioning test)