Is My Solar System Producing What It Should? How To Tell

Most Tampa Bay solar owners know when their system is off. Almost none know when it is running at 85 percent. Monitoring apps alarm on faults and zeros, not on a slow slide, and a system that lost a tenth of its output to a dirty array, a tree that grew, or a string of weak connectors will keep reporting green for years. The homeowner pays the difference on the power bill every month. This is how to check whether a system is doing what it should, what the usual causes are when it is not, and when it is worth having someone on the roof. Fused Solar and Roofing is a licensed roofing (CCC1331058), electrical (EC13014750), and building contractor (CBC1252064), all three in-house.

1. Start with the year, not the day

Daily production swings with clouds, and a bad week in June means nothing. The comparison that works is this year against the same months last year, and both against the first full year the system ran. Every monitoring platform shows monthly or yearly totals; export or screenshot them. A system in Tampa Bay degrades naturally at roughly half a percent a year, so a three-year-old system should be within a couple of percent of its first year, weather allowing. A drop of ten percent or more that holds for several months is a problem, not weather.

If the installer gave an annual production estimate at the sale, that is the other benchmark. A system that never reached it may have been oversold; a system that reached it and has since fallen away from it has a cause.

🔑 Key Takeaway: Compare spring to spring and year to year. A sustained ten percent gap is the number to act on.

2. Look at the panels individually if you can

Microinverter and optimizer systems show per-panel production, and that is where a quiet loss hides. One panel at sixty percent of its neighbors in the same row is shaded, dirty, cracked, or has a failing microinverter under it. Two or three low panels in a line along the bottom edge is debris or a tree. A whole group reading low together on a string system is often a connector or a string fuse. Screenshot the panel view at noon on a clear day and look for the odd ones out.

String inverters without panel-level data show the loss only as a lower total, which is why the yearly comparison matters more on those systems.

3. The usual causes, in order

Soiling. Oak pollen in spring, pine needles, bird droppings, and the film that settles on a roof near the water cost a Tampa Bay array five to fifteen percent until it rains hard or is cleaned, and a shaded lower edge packed with debris costs more. Shade from growth: a tree that was clear of the array at install has had years to reach the afternoon sun. A failed microinverter or optimizer, which drops one panel to zero and the string average by a few percent. A string that is down entirely on a string inverter, which some apps show only as a lower total. Corroded connectors near the coast, which add resistance and heat. And a module with a cracked cell, which produces less every year as the crack grows.

💡 Pro Tip: If the loss showed up suddenly in one month and stayed, it is usually a failed component. If it crept in over a year or two, it is usually soiling, shade, or a connector.

4. What a service visit does about it

Fused's technician starts with the monitoring history, then goes to the roof: a visual inspection of every module and connector, a look at the shade pattern at the time of day the loss shows, a check of each string or microinverter's output against its neighbors, and a look at the inverter and the disconnects. The visit is a flat $395 diagnostic, 20 percent less for plan members, and it ends in a written photo report that says what the cause is and quotes the fix separately. Fused does not do thermal imaging or drone surveys; a technician on the roof with a meter and a camera finds the cause of a production loss on almost every system.

Often the fix is a cleaning, which is booked at the panel-cleaning price or included in the annual plan, and the production returns the same week.

5. When it is the equipment

A failed microinverter or optimizer is replaced under the manufacturer's warranty where it is still in force; Fused is certified with Enphase, SolarEdge, Tesla, Generac, Fronius, and SMA and handles the warranty claim. A discontinued microinverter line, which a few Tampa Bay systems from the mid-2010s have, is a longer conversation about replacements or a change of equipment, and Fused lays out the options. A string inverter at the end of its ten to fifteen years is replaced, and the utility's interconnection record is updated for the new inverter.

⚠️ Warning: A system that lost a string and kept reporting green has usually been running that way for a year before anyone notices. Check the panel-level or string-level view, not just the total.

6. When it is the roof or the trees

Shade from a tree is solved with the tree, not the array, and Fused will say so rather than sell a fix. A roof that is aging under the array does not reduce production, but the inspection that finds a production loss is the same inspection that sees the roof, and a homeowner who learns the roof has three years left at the same visit can plan the re-roof and the detach and reinstall together. Fused Solar and Roofing is a licensed roofing (CCC1331058), electrical (EC13014750), and building contractor (CBC1252064), all three in-house. Who is allowed to do each part of that detach and reinstall, and why, is covered in our guide at https://fusedsolarandroofing.com/post/who-can-remove-reinstall-solar-florida

7. Keeping it from sliding again

Fused's annual solar maintenance plan is priced by panel count, starting at $495 a year, and includes an annual visual inspection with a written photo report, one panel cleaning, priority scheduling on service calls, and 20 percent off repair labor and parts. The spring cleaning restores the array before the high-production months, the inspection catches the connector and the cracked module before they cost a season, and the report gives the homeowner a year-over-year record to compare against. Between visits, Fused monitors members' systems for the error messages that mean something has stopped. The plan covers photovoltaic systems only, roof- or ground-mounted, and Fused takes systems it did not install.

8. Why homeowners bring a production question to Fused

Because the answer is on the roof, and Fused puts a licensed technician there with a camera and a meter rather than guessing from the app. It has serviced Tampa Bay systems since 2007, including thousands of panels installed by companies that are gone, and the company that diagnoses the loss is licensed to fix the equipment, the roof around it, and, when the time comes, to do the re-roof under the array.

🔑 Key Takeaway: Compare year to year, look at the panels one by one, and when the gap holds at ten percent, get a technician on the roof. The fix is usually cheaper than the power you are not getting.

Think your system is running low? Book a $395 diagnostic or ask about the annual plan at https://fusedsolarandroofing.com/fused-solar-roofing-service-department

Frequently Asked Questions

How do I know if my solar panels are underperforming?
Compare this year's monthly production to the same months last year and to the first full year. Normal degradation is about half a percent a year; a sustained drop of ten percent or more has a cause. On microinverter systems, look for individual panels reading low against their neighbors.

Why would my solar system produce less than it used to?
Most often soiling, shade from trees that have grown, a failed microinverter or optimizer, a string down on a string inverter, corroded connectors near the coast, or a cracked module. Sudden and sustained usually means a component; gradual usually means soiling, shade, or a connector.

What does a solar diagnostic visit cost?
A flat $395, 20 percent less for maintenance plan members, with a written photo report and the repair quoted separately.

Will cleaning my panels increase production?
In Tampa Bay, usually five to fifteen percent after a pollen season or on a roof near the water, and more if the lower edge is packed with debris. Cleaning is included once a year in the maintenance plan.

Does Fused check systems it did not install?
Yes, including systems whose installer is gone. Fused is certified with Enphase, SolarEdge, Tesla, Generac, Fronius, and SMA and handles manufacturer warranty claims.

Does Fused use thermal cameras or drones to find production problems?
No. A technician on the roof with a meter and a camera, plus the monitoring history, finds the cause on nearly every system, and the visit ends in a written photo report.

Fused Solar and Roofing has serviced solar systems across Hillsborough, Pinellas, Pasco, and Manatee counties since 2007, including systems it did not install. Schedule a service visit at https://fusedsolarandroofing.com/fused-solar-roofing-service-department

Fused Solar and Roofing holds Florida roofing (CCC1331058), electrical (EC13014750), and building (CBC1252064) licenses, all three in-house, and has served Hillsborough, Pinellas, Pasco, and Manatee counties since 2007. Fused Solar and Roofing is an EnergySage Elite Installer with a 5.0/5 rating and 21+ verified reviews, independent verification, earned not purchased. Book a $395 diagnostic or ask about the annual plan at https://fusedsolarandroofing.com/fused-solar-roofing-service-department