One panel is dark in the monitoring app: what that means and what it costs

A single panel reading zero or dark in the monitoring app is almost always the microinverter or the optimizer under that panel, not the panel itself. A one-unit swap is $300 to $600 installed, less per unit if several are done at once, and often labor only when the manufacturer honors the warranty. A real panel failure, which is rarer, is $400 to $900 per panel installed. A diagnostic visit is $150 to $350 and is usually applied to the repair.

Check this first

1. Open the app and look at that panel’s daily curve for a week. A flat zero from a specific date is a failed unit. A curve that dips and recovers at the same time each day is shade, and shade is a tree trim or an antenna, not a repair.
2. Check whether the dark panel is always the same panel. Enphase and SolarEdge both report per panel, so this is visible in the layout view. If different panels go dark on different days, that is a communications problem in the monitoring system, not a hardware failure.
3. Look at the panel from the ground. Visible cracked glass, a scorched spot, a brown streak inside the laminate, or a dangling wire changes the answer to the panel itself. If you see damage, read the cracked panel page.

That is where the safe list stops. Everything under the panel is live DC in daylight.

What is usually wrong

All ranges are published on the pricing page. The panel repair page covers the module side, and the inverter replacement page covers the electronics.

Why these fail here

Microinverters and optimizers are power electronics bolted to a roof, and a Cape Coral roof is one of the harder places in the country to be power electronics. Module-level units sit in the hot air gap under the panel through eight months of high heat, they take a salt aerosol load on every canal-front and island home, and they were rained on sideways by Ian on September 28, 2022 and again by Milton on October 9, 2024. Failures cluster: when one unit of a given vintage goes, the ones installed beside it on the same day are on the same clock.

The other local factor is age. A large share of Lee County’s residential solar went up between 2015 and 2023, which puts a lot of M-series and IQ6 era Enphase hardware and first-generation SolarEdge optimizers into the window where individual failures start.

The warranty is the whole story here

This is the repair where the warranty matters most, because the part is expensive and the labor is not. Enphase publishes a 25-year limited warranty on its IQ and M-series microinverters and SolarEdge publishes 25 years on power optimizers, and both are tied to the equipment rather than to the company that installed it. If your installer closed, those warranties still stand.

The catch is in the fine print. Enphase’s published U.S. warranty excludes the cost of labor to uninstall and reinstall a covered product, requires the claim within 90 days of discovering the defect, and ships the replacement to the original installation address. So the realistic outcome on a covered unit is a free part and a paid roof visit. That 90-day clock is the reason not to sit on a dark panel for a year. How to file, step by step, is on the Enphase page and the SolarEdge page, and the orphaned system service covers doing it for you.

What to expect on the call

Send a screenshot of the app showing the panel layout with the dark unit, a photo of the array from the ground, and the inverter or gateway label. That shows the brand, the generation, and whether the unit is inside its warranty term. If it is, the claim goes to the manufacturer, the part ships, and the labor is what you pay us for. If you have more than one dead unit, get them quoted together, because a second roof visit costs more than a second microinverter does.

If your roof is also due for replacement, say that too. Everything under the array is accessible for free during a detach and reset, and doing the swaps then saves the access charge entirely.