One Solar Panel Not Producing? What a Failed Microinverter Looks Like
On a microinverter system, every panel reports on its own. When one or two go gray or show zero, it can be a communication hiccup, a wiring problem, or a failed microinverter. Here's how to tell them apart.
“The price was in budget and they were able to accommodate our roofer's schedule.”
Suzette L. · Google Review
“I highly recommend Solar Fix for their caring approach and top-notch service!”
Melissa D. · Google Review
“Very refined process in place here with lots of communication.”
Brian G. · Google Review
The short answer
If one panel in your monitoring app shows zero or "not reporting" while the rest look normal, the problem is usually limited to that panel's spot on the roof. It might be a communication issue, a loose connection, or a microinverter that has failed.
If several panels go quiet at once, it's more often something they share, like wiring or the communication link, than several microinverters failing on the same day.
Either way, you can narrow it down from the ground before anyone climbs on the roof.
How microinverter systems are different
Many Arizona homes have a microinverter system, most often from Enphase. Instead of one inverter on the wall, each panel has its own small inverter mounted underneath it. That's why your app can show production panel by panel.
It also means a single failure doesn't take down the whole system. One microinverter can stop while the rest keep working. That's good for production, but it's also easy to miss if nobody is checking the app.
If your whole system has gone quiet, not just a few panels, our guide to a solar monitoring app that stopped updating is the better place to start.
"Not reporting" vs. "not producing"
These sound similar, but they point to different problems.
Not reporting means the app isn't getting data from that microinverter. The microinverter may still be producing power. The problem is getting the information from the roof to the app.
Not producing, or a panel that shows zero while the sun is up, is a stronger sign that something has stopped working: the microinverter, the panel, or the connection between them.
Some solar companies note that microinverters often keep producing even when they aren't sending data, because the status only tells you the communication link is broken. So a gray panel in the app isn't proof of a failure by itself.
What you can safely check
None of these steps need tools or a ladder.
1. Count the affected panels. Is it one, a few in a row, or all of them? Note which ones in the app. 2. Check the time and weather. Early morning, late afternoon, and heavy cloud can make panels report low or late. Check again around midday on a clear day. 3. Look at the gateway. The gateway, sometimes called an Envoy or IQ Gateway, is the box that collects data from the microinverters. Make sure it has power and that its lights look normal. 4. Plug the gateway into a wall outlet. Enphase systems send data over your home's wiring. A gateway plugged into a power strip, surge protector, or extension cord can have trouble talking to the microinverters. 5. Wait a day. Short reporting gaps sometimes clear on their own, for example after a system update.
If the same panel stays at zero for several sunny days, it's time for a technician.
What a technician checks
Enphase's own troubleshooting guidance gives a sense of what happens next. If more than one microinverter is affected, it is most likely a wiring issue. If the error shows up often, Enphase suggests checking the home for sources of interference to the power-line communication.
For a single microinverter, one test is to swap it with a working neighbor. If the microinverter starts and the previously working microinverter stops, the issue is not coming from the microinverter. It's coming from the panel or wiring on that spot. If the suspect microinverter stays dead in a known-good spot, it's the microinverter.
That kind of test happens on the roof, with the system shut down properly, and it's work for a licensed solar technician.
About the warranty
Many microinverters carry long manufacturer warranties, but the details matter.
- ▸Find your model. The microinverter model is often listed in your installation paperwork or monitoring app.
- ▸Read the coverage. Enphase's limited warranty for its M215 microinverter, for example, runs twenty-five (25) years from the date of original purchase. Other models have their own terms.
- ▸Check what's excluded. That same warranty does not cover costs related to the removal, installation or troubleshooting of the owner's electrical systems. So even when the part is covered, you may still pay for the labor to diagnose and replace it.
If your installer is no longer in business, the manufacturer's warranty may still apply. A licensed solar company can usually help you file the claim.
Why it's worth fixing
One panel out of 20 or 30 may not sound like much. But a dead panel stays dead every sunny day until someone fixes it, and in Arizona that's a lot of days. If a second or third microinverter fails later, the losses add up, and the problem can go unnoticed for a long time if nobody is watching the app.
When to call for help
Get the system looked at if:
- ▸One or more panels show zero production for several sunny days.
- ▸Several panels went quiet at the same time.
- ▸The app shows errors you can't clear by checking the gateway.
- ▸You don't have access to your monitoring and can't tell what's working.
A solar repair visit can track down whether it's the microinverter, the panel, or the wiring. If a microinverter or other inverter needs replacing, our solar inverter repair page explains what to expect. If you're not sure what condition the whole system is in, a solar assessment gives you a full picture.
The bottom line
A gray or zero panel in your app is a clue, not a diagnosis. Check how many panels are affected, give it a sunny midday, and make sure the gateway is powered and plugged into the wall. If a panel stays at zero, have a technician find out whether it's the microinverter, the panel, or the wiring, and check your warranty before you pay for parts.
FAQ
Is my panel still making power if it says "not reporting"?+
It may be. Not reporting means the data isn't reaching the app. The microinverter can still be producing. A panel that shows zero production while the rest are normal is a stronger sign that something has actually failed.
Does the microinverter warranty cover the labor to replace it?+
Check your warranty document. Enphase's limited warranty for its M215 microinverter, for example, does not cover costs related to the removal, installation or troubleshooting of the owner's electrical systems. Coverage varies by model, so look up the warranty for yours.
Can I replace a microinverter myself?+
No. Microinverters are mounted under the panels on your roof and connected to live wiring. Replacing one takes a licensed solar technician.
Related: Solar repair · Solar inverter repair · Solar monitoring app not updating · Solar assessment
Got a panel that's gone quiet?
Send SolarFIX a screenshot of your monitoring app showing which panels are affected, plus your system brand if you know it. We'll help you figure out whether it's communication, wiring, or a failed microinverter.