DIY Solar Panel Install
I integrated the solar panels into the roof, some interesting points:


The angle is 70 degrees (steep to maximise winter output) - snow falls off and rain washes off dust so never needed cleaning in 15 years.
The panels are the waterproof covering so saving the cost of the tiles beneath.
The array is in series to give about 380V DC, this minimises the losses , as well as a cable over-specified to keep losses to a minimum.
The annual output exceeds the predicted (or simulated) output by about 15% - due to the winter sun being reflected off the snow onto the panels - remember the steep angle...
The annual production exceeds the annual use - but that is what it was designed to do.


So, work out what you want to achieve and make sure you account for all use...