YOUR NEEDS & REQUIREMENTS, e.g. goals, location, asthetics, budget.
GEOGRAPHIC LOCATION & ORIENTATIONS, generally, north facing is better in the southern hemisphere.
ROOF AREA, the more usable roof area, at least sufficient for required number of panels, facing north, the better; less area will be required if higher efficiency panel 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 mounting installation process.
SHADING, clear, unobstructed access to the sun is preferred.
TILT, usually the tilt is that of the roof, but if an increase in tilt is required, the mounting system can be adjusted to accommodate.
ROOF TYPE, solar panels can be installed on almost every roof type using the appropriate mounts.
ELECTRIC MAIN PANEL SIZING & BREAKER SLOT(S) AVAILABILITY
SELECTING SOLAR PANEL PHYSICAL SIZE, power output and quantity based on production desired and cost.
SELECTING INVERTER QUANTITY & TYPE, based on electrical characteristics.
MOUNTING & RAILING
CLEARANCE BETWEEN ROOF & PANELS, to allow proper air circulation.
WIRING GAUGE & LENGTH
ROOF OBSTRUCTIONS, such as chimneys or vents.
LAYOUT & ROUTING OF COMPONENTS, panels, inverters, junction boxes, cut-off switches, wiring, grounding poles, breakers.