Depends on how you are doing it. If the solar is also your roof surface it isn't an extra job, it is just a materials choice. edit - also, given how much risk

Depends on how you are doing it. If the solar is also your roof surface it isn't an extra job, it is just a materials choice. edit - also, given how much risk there is in the prep and teardown for scaffolding, combining roof jobs will generally reduce the overall risk a lot, even if you can't combine tasks any further than that.