Where to Put Solar Panels: Shade, Roof, and Ground

I once assumed “south-facing roof” was the whole placement guide. Then a spruce branch I ignored in July stole half our winter production. Placement is as much about seasons and shade as it is about direction.

If you’re still learning the parts, start with Solar Basics: Panels, Batteries, and Inverters Explained. This guide assumes you know what a panel is for and care where it lives on a real piece of land.

What “good sun” means across the year

Summer sun sits high and forgives mediocre placement. Winter sun sits low, throws long shadows, and exposes every tree, chimney, and dormer you forgot about in July.

In the northern hemisphere, south-facing orientations generally see more sun over the year. Tilt, how steeply panels lean, trades summer and winter performance. I care less about perfect textbook angles on day one and more about whether the spot still sees sky when the sun is skimping along the treeline in November.

Peak production hours (often late morning through early afternoon) matter more than a site that is “kinda sunny” from sunrise to sunset with shade in the middle. A panel that cooks for four clean hours can beat one that is dappled all day.

Our July walkthrough once looked fine. Our November walkthrough did not. I trust the low-sun season more than a hopeful summer afternoon.

Shade is not a small problem

A little shade is not a little problem. On many string setups, shading part of an array can kneecap output far out of proportion to the shadow’s size. Leaves, antennas, and “just one branch” count.

Trees grow. Roofs get new vents. A temporary shade object becomes permanent while you’re busy with other projects. I walk sites in the morning, midday, and afternoon when I can, and I try to repeat that mental map in a different season before we commit money.

Bypass diodes inside panels and optimizers or microinverters on more modern setups can reduce how much one shadow punishes a whole string. They’re tools, not permission to plant a panel under a spruce and hope. Hardware that mitigates shade still prefers a clear sky.

The branch that hurt us only mattered when the sun sat lower. Summer hid the mistake; winter graded it.

Roof mounts, when they make sense

Roof mounts use structure you already heat and insure. They keep panels away from ground clutter, animals, and lawn ambitions. For some cabins, the roof is simply the only clear plane that faces the right way.

Trade-offs: you’re working at height; penetrations can leak if done poorly; snow may shed differently than you expect; cleaning and inspection are harder. Structural load and roof age matter. If you’re unsure whether the roof can carry the array or how to flash mounts, that’s a hire-a-pro moment, not a pride moment.

We put one array on the roof because the clearing we wanted for ground mounts wasn’t ready and the roof exposure was honest. It wasn’t free of compromise; it was the better compromise that year.

Ground arrays, when they’re worth it

Ground arrays earn their keep when you have (or can make) a true clearing. You can often set a better tilt, walk up for maintenance, brush snow, and keep vegetation from turning into shade without climbing.

Trade-offs: they use land, need thought about animals and mowing, can look industrial if you don’t plan for it, and push you to run cable farther to the house. Cable length and burial or protection are part of the real cost, not an afterthought.

Our ground array is the one we can actually reach. That accessibility matters on a gray week when you’re already tired. It also means we notice new shade earlier, birch suckers and spruce tips don’t get a two-year head start above a gutter line we never inspect.

If your only “ground option” is a dim pocket between trees, you’re not choosing ground vs roof, you’re choosing bad sun vs better sun somewhere else.

A placement decision checklist

Work it before you buy more panels:

1. Map shade obstacles in summer and in low-sun season, trees, chimneys, ridges, future growth.
2. Compare roof vs ground on sun quality first, convenience second.
3. Measure the cable run and include it in cost and complexity.
4. Plan access for cleaning, snow, and inspection you’ll actually do.
5. Prefer fewer panels in the best spot over more panels in a mediocre one.
6. Recheck after one winter of production data. Notes beat memory.

When we expanded, we added to the site that already earned its keep instead of “filling out” a shadier roof face because it looked symmetrical. Symmetry doesn’t charge batteries.

Where to go next

Keep Solar Basics: Panels, Batteries, and Inverters Explained nearby for vocabulary. Size the loads and the bank so placement has a job to do. And walk the property again in November, that’s when the spruce tells the truth.