@lyse You so go to have around Lyse. I going to see if a local Engineer has a 20mm bit and drill these holes straight away, otherwise, I will have to drill it myself as you say. Who would know the most important hole is called the fixing hole and the least important hole is called the stud hole. Stupid terminology, nothing is every explained/

Hoping the solar panels will create a tropical roof affect over the building and shade it somewhat. This frame will hold 12 solar panels, each 200 watt, giving me, using the MPPT a theoretical yield of 2400 watts. Over a 4 hour sunshine, I should get in theory 9,600 watts of power. For a 24 Volt system, this means I should get 9600/24= 400 Amp hours. Not sure of the theory verses the practical production of power, until the system is up and running.