In order to fit thicker 3 8 bolts into the 1 4 holes on the hightec solar panel we drilled out the hole with a 3 8 bit.
Fitting solar panels to roof rack.
The second option is called a comp out where your installer will remove the tiles where you intend to put solar then lay down composite shingle to install the array.
Your installer would temporarily remove the tiles install the hooks underneath into the roof then put the tile back over the mount and rack the system from there.
On all bolts we used blue loctite.
200w of solar panels on the roof rack installing the solar panels is done by using unistrut cone connectors 1 4 inch or 3 8 inch to attach to the slotted steel l brackets.
Both cone connector sizes are available at big box hardware stores.