(generally, south facing is better in the northern hemisphere)
Roof area
(the more usable roof area, at least sufficient for required number of panels, facing south, the better; less area will be required if higher efficiency panels are used)
Roof condition
(roof needs to be able to support the various forces resulting from the solar panels, as well as maintain integrity during and after the mount installation process)
Shading
(clear, unobstructed access to the sun is preferred)
tilt
(usually the tilt is that of the roof but, if adjustable, the location latitude minus about 12 degrees)
Roof Type
(solar panels can be installed on almost every roof type using appropriate mounts)
Electric Main Panel sizing and breaker slot(s) availability
Selecting solar panel physical size
(power output, and quantity based on production desired and cost)
