How Do You Know If Your Solar Panels Stopped Working?

Your solar system can stop producing without your house feeling any different. No dripping ceiling, no warm fridge, no room going dark. The grid quietly supplies more of the electricity your panels used to cover — and unless an alert fires or somebody is actually watching, months can pass before anyone notices.

That's the whole problem in one line: the system never sends you a bill for what it failed to make. So here's how to check, what your app can and can't tell you, and how to make sure you find out faster next time.

First: "broken" means three different things

Homeowners collapse three very different problems into one phrase, and they need different responses. One, the system has stopped producing — output is at or near zero. Two, the monitoring has stopped reporting — your app has gone blind, but the panels may be working fine. Three, the system is still producing every day, but materially below what it should.

The first is the most alarming and usually the easiest to spot once you look. The second gets mistaken for the first constantly. The third is the expensive one, because nothing about it looks wrong. Sorting out which one you've got is most of the job.

How do I check whether my system is actually producing?

Three places to look, and they cross-check each other. Open your monitoring app and read the exact status message. Look at your inverter or system display for a status indicator or current output. Then use your utility bill as an independent sanity check.

On a bright, clear day, a system showing no production when it should be generating is a strong reason to investigate — not proof of a fault, since export limits, battery state, or utility conditions can curtail output in some systems, but definitely worth a look. Indicator lights aren't universal either, so check what your specific equipment's guide says its colors mean rather than trusting a general rule. And treat the bill as a cross-check, not a diagnosis: bills move with weather, usage, rate changes, and billing-period length. If your app looks normal but your grid purchases jumped without an obvious explanation, that's your cue to dig.

"Offline" and "not producing" are not the same thing

This is the single most useful distinction in this article. If your app has lost contact with your system, you've lost visibility — not necessarily production. Enphase says this directly: a system going offline doesn't necessarily mean it isn't producing, and a "Gateway Not Reporting" message means the gateway lost its internet connection, not that your panels stopped.

Which sounds reassuring, and mostly is. But here's the catch that matters: while your monitoring is blind, a real production failure underneath would go unnoticed too. So a communication dropout isn't an emergency, and it also isn't something to shrug off for three months.

Why is underperformance the hardest to catch?

Because nothing looks wrong. A system that's completely dark shows an obvious zero. A system producing every day at well under what it should still shows sunrise-to-sunset curves, daily totals, and green status — it just quietly makes less. Picture a system running at 70% of what it should: nothing triggers a zero-production alarm, and that missing 30% costs money every month.

How easily you can isolate that depends on your equipment. Some systems give you module-level visibility; others show only inverter or whole-system totals in the homeowner view. The more granular your monitoring, the easier it is to spot one failed section — but what you can actually see depends on the architecture, the manufacturer, and how your monitoring account was set up.

👉 Not sure whether what you're producing is what you should be? Send us your production data and we'll take a look — no pressure, no pitch.

Who is actually responsible for noticing underperformance?

Ask your installer this exact question, and listen carefully: do you monitor my system, or did you just give me an app? Those are two completely different services sold with the same word, and the difference is the whole ballgame.

Monitoring hardware ships with cloud connectivity built in. An installer switches it on, hands you a login, and the install is done. The capability to detect problems exists. What's often missing is the operational part: who reviews the data, what triggers a service call, how fast. So follow up with the specifics — do you receive alerts, which ones, communication loss only or production issues too, does a person review them, how quickly do you contact me, and is that included indefinitely or only during a service period? A real answer is concrete. "You'll see it in the app" means the answer is you.

When is lower production normal?

Often. Production is supposed to fall in winter — shorter days, lower sun angle. Heat reduces panel efficiency, so peak summer afternoons underperform lab ratings by design. Dust, pollen, and new tree growth shave output gradually.

Two dips that look alarming and usually aren't: if your output flattens at a ceiling on bright afternoons, that can be intentional design rather than a fault — a degree of clipping is often deliberate. And with a battery, production can look throttled when it's full and exports are capped. What separates normal from broken isn't the size of a single dip; it's whether the pattern matches what you'd expect for this season, this weather, and this system.

What should I do when something looks wrong?

Start with the error message. Screenshot it, and note when the data or production last looked normal — that's the most useful thing you can hand a technician. Then follow the troubleshooting steps for your exact manufacturer and model.

A communication problem often traces to something ordinary — a new router, a changed Wi-Fi password, an internet outage. Enphase's own first step is checking that your home Wi-Fi is online, then following the equipment-specific steps in its app. But don't apply another brand's procedure to your system. Do not open an inverter, combiner, battery, or other electrical enclosure, and don't operate breakers or disconnects unless your manufacturer's instructions for your exact equipment tell you to. Solar systems contain energized electrical equipment on both the roof and equipment side, and the architecture varies. If the status points to an electrical fault or a genuine production problem, call a qualified solar service provider.

What if the company that installed it is gone?

You're not stuck, but be precise about what survives. Manufacturer-backed equipment coverage may remain even if your installer closes — subject to the manufacturer still operating and to the warranty's terms. Another qualified or authorized service provider may be able to work on the system, but they don't automatically assume your old installer's workmanship obligations. We've written a fuller breakdown of what survives a solar bankruptcy and what doesn't.

The important part is not to wait. Every month of silence is production you paid for and didn't get, and unlike a leaking roof, nothing escalates to force your hand.

How do I build a baseline worth comparing against?

In layers, because no single number does the job. Your proposal's first-year kWh estimate is a rough annual benchmark — useful for spotting large, sustained shortfalls, not for judging one cloudy month. Your own history is better: compare this month against the same month in previous years. Then account for conditions — season, weather, shading, heat.

And for an actual underperformance diagnosis, what you want is a comparison of measured production against expected production under the conditions that actually occurred — which is what good monitoring, or a service provider doing this properly, gives you. That's also the sharper question to ask before you sign: what production benchmark will you use after installation to decide whether my system is underperforming?

Solar may be the strangest failure in a house, because losing production doesn't change how the house behaves at all. The grid just fills the gap. Nothing gets louder — your solar simply gets quieter.

👉 Get a free IntegrateSun system check — we'll compare what your system is producing against what it should be under real conditions, and tell you straight whether it's normal.