Late August is when we get the worried phone calls. The app that showed a beautiful green curve in June is suddenly reporting less, the sky over Camas has that flat orange look, and the natural assumption is that something has broken.
Usually nothing has. Here is what a healthy Pacific Northwest solar system actually looks like at the end of summer, and the three patterns that genuinely warrant a call.
Why is my solar production dropping in August?
Because the days are getting shorter and the sun is dropping lower in the sky, and because this is smoke season. Peak production here lands around the summer solstice in June. By late August you have lost well over an hour of daylight and the sun crosses lower, so even a perfectly clean, perfectly working array makes noticeably less than it did eight weeks earlier.
This is normal, it is predictable, and it was already accounted for in the annual estimate we gave you. Annual production is the number that matters, not any single week.
How much does wildfire smoke actually cost you?
Thick smoke behaves like heavy overcast. It scatters the light rather than blocking it outright, so output drops noticeably while the smoke sits overhead and then recovers completely once the air clears. There is no lasting damage and nothing to reset.
Over a full year, smoke days are a small fraction of total production in this region. The time to think about it is not during the smoke, but when sizing a battery: the worst smoke days often coincide with the highest risk of a public safety power shutoff, which is a resilience question rather than a production one.
What should I actually check in the app?
- Compare year over year, not week to week. August against last August tells you something. August against June tells you only that the earth is tilted.
- Look at the shape of the daily curve. A smooth arch with a rounded top is healthy. A curve with a sharp notch cut out of it at the same time each day is shading. Often a tree that has grown.
- Check that every panel or string is reporting. One dark section while the rest produces is the single most common real fault, and it is invisible unless you look.
When should you actually worry?
Three patterns are worth a phone call rather than a wait-and-see.
- A string or group of panels reporting zero while the others work. That is a fault, not a season.
- Production down sharply against the same month last year on a clear day, with no new shade to explain it.
- Monitoring that has gone dark entirely. An offline portal means you would not see a real fault if you had one, and we see systems that have quietly under-produced for years because nobody was watching.
Why do generic monitoring benchmarks mislead here?
Most online rules of thumb about “expected output” come from sunnier, drier places. Our summers are genuinely excellent for solar and our winters are genuinely poor, so a Pacific Northwest system has a far bigger seasonal swing than a national average suggests. Judged against a flat monthly benchmark, a perfectly healthy Washougal array looks broken in November and superb in July.
A local installer sizes and models the system on that curve to begin with, which is why our estimates are annual, and why we compare your production against the model for your specific roof rather than a generic figure.
Frequently asked questions
Is it normal for solar production to drop in August?
Yes. Peak production is around the June solstice, and by late August you have lost more than an hour of daylight and the sun sits lower. A healthy system produces noticeably less in August than in June.
Does wildfire smoke damage solar panels?
No. Smoke scatters sunlight and reduces output while it lingers, then production recovers fully once the air clears. Ash sitting on the glass is worth rinsing off, but the panels themselves are unharmed.
How do I know if my solar system has a fault?
Look for a string or group of panels reporting zero while the rest produce, a sharp drop against the same month last year with no new shading, or monitoring that has gone offline entirely. Those three are worth a call.
Should I clean my panels after smoke season?
Often yes, once the ash settles. Pacific Northwest rain handles most of it, but a heavy ash layer is worth rinsing. Use soft water and a soft brush, never a pressure washer or abrasive cleaner.
Will you look at a system your company did not install?
Yes. We inspect, diagnose and repair arrays regardless of who installed them, and you get a written account of what we found and what does not need spending on.
Not sure what your numbers mean?
Call 360-313-7190 and we will look at it with you, no pressure, and no charge for an honest answer. We serve Camas, Washougal, Vancouver, Portland and the Columbia River Gorge.
