For fitting standard modules over an existing wall, a Hook-On system can be used. The modules are mounted ‘sideways’ (i.e. landscape orientation).
Complete Hook-On systems comprise of the solar array of standard modules pre-fitted with mounting hooks, complete Hook-On mounting structures, a suitable inverter (or inverters) and all the main electrical installation components, such as DC connection boxes, array cables, etc. The wall-mounted support channels are normally supplied as part of the mounting system, but not the actual wall fixings.

Each module is pre-fitted with a pair of Hooks.
The Hooks have slots that will fit over bolts.

Aluminium U-channels are attached to the wall of the building. These have holes drilled to accept bolts which the hooks fit over. There is an anti-theft option, which means a special tool is needed to remove modules.