5 Signs Your Solar Inverter Is Failing (And What to Do About It)

Your solar panels get all the attention, but they're actually the most durable part of your system. Panels commonly last 25 to 30 years with minimal degradation. The inverter is a different story. It's the component that works hardest — converting every watt of DC power your panels generate into the AC power your home uses — and it's the component most likely to fail.

In Central Florida, where rooftop temperatures regularly exceed 140°F in the summer months, inverters operate under thermal stress that manufacturers in cooler climates didn't fully account for. An inverter rated for a 15-year lifespan in the Pacific Northwest may give you 10 in Orlando.

The problem is that inverter failure is easy to miss. Unlike a panel issue, which often shows up gradually, inverter problems can emerge suddenly — and a failed inverter means your panels are generating power that never reaches your home or the grid. You're essentially running a solar system that produces nothing while your utility meter keeps spinning.

Here are five concrete warning signs that your inverter may be failing, what each one means, and whether you can diagnose it yourself or need a technician.

Sign 1: Production Drops to Zero or Near-Zero Suddenly

This is the most obvious sign and the one most homeowners catch — eventually. If your system goes from producing 30–40 kWh per day to producing nothing, your monitoring app will tell you, provided you're checking it.

Pull up your production history in Enphase Enlighten , SolarEdge MySolarEdge , or SMA Sunny Portal and look at the production graph. A healthy system produces a smooth bell curve each sunny day. A failed inverter shows up as a flat line — zero production across an entire day or multiple days, even during peak sun hours.

One or two microinverters going offline shows up differently: you'll see a dip in production from certain panels, but the rest of the array keeps producing. A string inverter or central inverter failure takes everything down at once.

DIY or pro? The monitoring app tells you something is wrong, but it won't tell you why. A production gap is a signal to call a technician — don't assume it's just a communication glitch and wait it out. A week of zero production on a Duke Energy account costs real money at 18.1¢/kWh.

Sign 2: Red or Yellow Indicator Lights on the Inverter Unit

Walk to wherever your inverter is installed — typically the garage wall, an exterior wall near the electrical panel, or in some microinverter setups, the inverters are mounted directly on the roof under each panel. If you have a string inverter or a hub, look at the indicator lights.

A green light means normal operation. A solid or flashing red light means the inverter has detected a fault it cannot self-clear. A yellow or amber light typically indicates a warning condition — the system is still producing, but something is outside normal parameters.

Different manufacturers use slightly different light sequences. Enphase IQ series units communicate through the Enlighten app rather than physical lights, so no light at all can itself be a sign that a microinverter has lost communication. SolarEdge inverters use a combination of green, red, and blue lights. SMA inverters use red, green, and yellow with blinking patterns that correspond to specific fault codes documented in the manual.

DIY or pro? You can observe and document the light pattern yourself. Photograph it and check the fault code in your inverter's manual. But interpreting the fault and correcting the underlying cause requires a licensed technician.

Sign 3: Error Codes or Fault Messages in Your Monitoring App

Modern inverters don't just fail silently — they throw codes. The challenge is knowing what those codes actually mean.

A few common examples:

• Enphase "Communication Error": A microinverter has lost its connection to the Envoy gateway. This can be caused by a failed microinverter, a damaged trunk cable, or a networking issue. If it affects one panel, suspect the microinverter or the trunk cable connector. If it affects all panels, suspect the Envoy.
• SolarEdge "AC Grid Fault": The inverter detected an issue with the grid connection — voltage or frequency outside acceptable range. This can be a utility-side issue (brief and self-resolving) or a wiring problem at the AC disconnect. If the fault clears and production resumes, monitor it. If it recurs, it needs investigation.
• SMA "Insulation Failure": The inverter detected a ground fault in the DC array. This is a safety condition and the inverter will shut down until it's cleared. Don't ignore this one — it can indicate damaged wiring, moisture in a junction box, or a compromised panel.

Error codes are your inverter telling you something specific. They're not noise. A code that appears once and clears may be a transient grid event. A code that reappears is a pattern that needs diagnosis.

DIY or pro? Reading the code is DIY. Clearing it without understanding the cause is not — you may clear the fault and restart the system into an unsafe condition. Recurring fault codes always require a technician.

Sign 4: The Inverter Is Unusually Hot or Making Strange Sounds

String inverters and SolarEdge inverters with power optimizers are installed in accessible locations — typically a garage or exterior wall. During normal operation, they run warm. Running hot enough to be uncomfortable to touch, or hot enough to discolor the wall surface behind the unit, is not normal.

Central Florida's climate is already working against your inverter's thermal management. An inverter in a non-air-conditioned garage can see ambient temperatures above 100°F in July. If the unit's internal cooling — whether passive heat sinks or active fans — is failing, thermal runaway becomes a real risk. Most modern inverters have over-temperature protection that shuts them down before catastrophic failure, but by the time that kicks in, internal components have already taken damage.

Unusual sounds are another flag. A mild hum during operation is normal. Buzzing, clicking, or high-pitched whining can indicate a failing capacitor, a struggling cooling fan, or loose connections vibrating under load. These sounds tend to worsen over time and don't self-resolve.

DIY or pro? Don't open the inverter housing. Inverters store charge even when disconnected from the grid and can cause serious injury. Observe from outside, document what you're experiencing, and call a technician.

Sign 5: Your Utility Bill Went Up and Nothing Changed in Your Usage

This is the sign that slips past the most homeowners for the longest period of time. If your inverter is partially degraded rather than fully failed, it may still show some production in your monitoring app — but at a significantly reduced level. You may not notice a 20% or 30% production drop month-to-month, especially if you're not comparing against the same month in prior years.

But your Duke Energy or OUC bill will notice. A system that was offsetting $150/month in grid consumption and is now only offsetting $90/month adds $60 to every bill — silently. If your usage patterns haven't changed (same household size, no new appliances, no unusual occupancy), an uptick in your bill is worth investigating as a system performance issue, not just a rate increase.

OUC customers in parts of Orlando and Lake Nona benefit from a lower rate of roughly 12.6¢/kWh compared to Duke Energy's 18.1¢/kWh , but a degraded inverter costs you money at either rate.

DIY or pro? Pull 12 months of utility bills and compare month-over-month. If the trend doesn't match your system's production data, you have a discrepancy worth investigating. This is exactly what Solarama's Free Bill Evaluation is designed to uncover — we map your actual bills against your production data and identify where the gap is.

Understanding Inverter Types: Why It Matters for Diagnosis

Not all inverters fail the same way, and knowing what type you have changes how you interpret the warning signs above.

• String inverters: One central unit converts DC power from all panels wired in series. One inverter failure takes down the entire array. Easier to diagnose, but the impact is total.
• Microinverters (Enphase): Each panel has its own small inverter mounted on the roof. Failure affects one panel at a time. The system keeps producing, but you lose output from any failed unit. Early-stage failure can be masked by the rest of the array continuing to perform.
• Power optimizers with a central inverter (SolarEdge): Optimizers on each panel manage DC output; a single central inverter handles conversion. A failed central inverter takes down everything. A failed optimizer reduces output from one panel.

Solarama services all three architectures across Central Florida — Enphase, SolarEdge, and SMA systems in Orange, Lake, Seminole, and Polk counties.

What to Do If You're Seeing These Signs

Don't wait and hope the problem resolves itself. Inverter issues don't self-heal — they progress. A partial failure becomes a full failure. A fault code that clears today comes back next week and the week after, each time putting more stress on the surrounding components.

The right first step is a $50 Remote System Check . Solarama pulls your production data directly from your monitoring platform, reviews your fault history, and gives you a clear picture of what's happening inside your system before anyone drives to your house. If the remote check identifies an issue that requires an on-site visit, that $50 is credited toward the service call. You're not paying twice.

If you're not sure whether your system is performing where it should be, start with the Free Bill Evaluation — we analyze your utility bills against your expected production at no cost. It takes one conversation and a copy of a recent bill.

We're open seven days a week. We work on systems we didn't install. If your original installer isn't returning calls — or isn't in business anymore — that's not your problem to absorb. It's ours to solve.

Book your Remote System Check or Free Bill Evaluation at solarama.us/book. Call or text 407-900-6055. Solarama LLC | License CVC57175 | Serving Orange, Lake, Seminole, and Polk counties.