Solar in San Antonio has a long sunny season and a hail risk sitting on the same roof. Production follows clear heat for months. None of that helps if the array is fastened through cracked tile or tired underlayment. Concrete and clay tile need mounts and flashing made for tile so a downpour does not follow the bracket under the clay. Asphalt slopes that have baked all season need an honest look at the deck before anyone adds holes.
Ask what the modules are expected to take in a hailstorm, and how a later roof repair reaches the underlayment without destroying the layout. Storms here bring ice and heavy rain together, so a penetration that is only caulked will leak when the plateau sends the next one. Shade from live oaks in older neighborhoods wipes out afternoon sun that a front photo still shows as open. Say if you will keep those trees.
Heat on the roof deck is extreme for a long stretch, and equipment has to shed it and stay reachable. Ask where the inverter will sit, how you will see a string go quiet after hail, and whether the electrical service can take the connection. Broken tile already on the ground is a clue that this slope sees ice. Mention it. Do not let the layout ignore the underlayment, because the waterproof layer is what the rain will test, not the color of the module.
Permits and interconnection are part of the work. Ask who pulls the building permit, who files with the utility, and whether the system stays off until permission to operate is real. Ask who lifts the array when the tile or the shingles are replaced after a storm, not only at the end of a calm life. Get the module and inverter models named. An aerial photo has not seen a cracked tile, a soft deck, or the late-afternoon oak shade.
Have the address, tile or asphalt, and the rough age of the roof. Say which slopes sit under oaks and whether hail has already marked the surface. Ask for a site visit about structure, flashing, hail, shade, and permission to operate. Keep the talk on the roof and the gear. Call the number on this page.