Solar in Sacramento gets long, hard summer days and then a winter of rain and tule fog that cuts production back. The summer is the generous season. Roofs see high sun and little marine haze. The catch is the roof itself and the trees. Deciduous street trees shade the busiest planes in the hot months, which is exactly when the array would otherwise be working hardest, and they drop leaves onto the glass and into the gutters. In winter the branches are barer and the sky is worse. A layout that ignores that calendar is a drawing of an empty field, not of a grid neighborhood. Ranches on open lots have the opposite gift: broad planes and less shade, after the roof has baked all summer.
Judge the roof before the array. Composition that has lost its face in the heat should not be covered until it can shed the coming wet season. Tile fails at the underlayment. Bungalow roofs are chopped by dormers, porches, and cooler curbs that steal the clear area and cast their own shadows. A west plane produces late, in the hottest hours, and it also takes the thermal stress. A north plane under a sycamore may be a waste. Ask for shade across the day in summer, not a single noon snapshot in a leafless month. Pollen, dust, and leaf litter film the glass. Production will surge on clear heat and sag when the valley is socked in. That is the climate. The layout either respects it or it does not.
Equipment has to reach a panel that may already be busy with cooling loads. Shutoffs need a place you can stand. When the roof needs work, and Sacramento roofs need work after enough summers, the array has to come off. Ask that question while the layout is still a drawing. Ask which planes stay clear through a hot afternoon and whether the deck underneath is sound.
Call with the roof material, the trees, and whether winter mornings sit in fog. Mention curled shingles, a cooler curb, or a panel that is already full. The useful subject is production and roof condition under Sacramento sun, then under Sacramento winter.
Call the number on this page.