The 10 dumb myths of solar installers
Frames should be used to ensure panels are optimally tilted to the North
No, this is old thinking. Adding the cost of 20 or 30 cents per watt to a system that costs $1.00 per watt so the the panels are ideally tilted to eek out every bit of output from a panel is a complete waste of money. With the exception of completely flat roofs where build-up of dirt and grime will be a real problem, flat racking is the go. If space permits, you could instead install 30% more panels for the same price as using tilt framing. Better to install more panels than frame – because that creates economies of scale and brings the cost of panels down in the future!