Solar in Iowa has a clear prairie sky and a hail problem on the same lot. Modules add uplift when wind gets under the rails, and they add a glass surface storms can mark. A farmstead ridge is not a maple-shaded town lot. The roof deck and the rafters come first. If the shingles are already bruised, say that before you talk about the sun. A tired roof under an array becomes two jobs done in the wrong order.
Silos, a south windbreak, and a neighbor's barn all cast shade. Say what stands south of the ridge and whether leaves cover the slope in summer. Winter sun rides lower. A hip, a gable, and a machine-shed roof are different mounts. Fasteners have to reach structure, not just a dented panel. Snow will sit on a low pitch. The surface has to take fasteners without turning the next rain into a leak.
Hail that bruises shingles can mark module glass in the same pass. Ask how the array is tied down against open-country wind, not only how it looks from the lane. Critters nest in the warm gap; if you already hear them, say so. If the roof is due, replace it in an order that installs once. Marked glass and a bruised mat should be described separately. Do not cover a soft deck and hope the storm was the last one.
Output swings from long summer days to weeks under snow or storm cloud. An inverter needs air; a closed attic is a poor closet. Say if the main electrical panel is old or full. A house and a barn may not share a panel. Say which building you mean. Say whether you expect to clear snow or leave it. Open sky is wasted on a slope that already failed.
Lead with the roof you have, the shade you see, and whether hail or wind has already marked it. Name the town and which way the ridge runs. Iowa storms will test whatever you fasten. Call the number on this page.