I know there are an abundance of wiring schematic examples going around at the moment but do they not need to be specific to the job? i.e a drawing that has the customers details, address, system size and so on. Also drawn to represent the system installed, i.e the locations of equipment relative to the building?
Selby Design offer a full 'job specific' design package for solar pv installers in accordance with MCS. This includes an A3 drawing consisting of a site plan of the address, a plan of the roof area in question and a projected view showing the true roof space available with the proposed panel layout and fixing method. Also included is a 'job specific' A3 electrical schematic that can be provided as part of the O&M and laminated and put up beside the inverter. All drawings branded in your company logo etc and providing a much more professional design service/package to your customer.
With tough times for solar pv and tough competition, it's these edges that are going to make the better businesses stand out among the crowd and get higher numbers of recommendations. One client of mine works purely on leads that are through recommendation with no need for purchased leads.
For more information on the installer design support services available, please message me and I can provide examples of the drawings delivered.