Solar in Las Vegas belongs on a roof that the sun has already been baking, which is the reason to slow down and look. Composition roofs lose granules and dry out underneath. Tile cracks when people walk it. Foam needs its own fastening story and may already be tired. Covering a finished roof with an array is how a later leak turns into an argument about who owns the hole. West and south slopes are the harsh ones and also the ones an array wants. Start with a person standing on the roof you have, not an image from above.
Ask the age and the material. Ask whether the covering gets repaired or replaced before any bracket is set. Ask the flashing detail and who is responsible when a penetration leaks into a house that may not see rain again for months, so the leak might show up late. Ask how the array comes off for the next roof without breaking the field. Vents, a cooler if you still have one, and skylights already take space. Say what occupies the plane.
Then open the panel. Valley houses often run a large condenser, and many run a pool pump beside it. The panel may be full, hot, and original to a fast build. Ask for the module and the inverter to be named. Ask whether electronics are on each module or in one string unit. Ask who can see production and who you call when a portion goes quiet. Dust will film the glass in a city that rarely rinses it. Ask how access for that is supposed to work on tile that should not be a walkway.
Ask who pulls the permit and who files the interconnection, and whether the system waits for permission before it runs. Ask whether you will own the equipment. Bring the roof truth and skip the bill pitch. Call the number on this page.