Short answer
Solar inverter repair in Washington, DC starts with reading the fault code and testing the strings, because many inverter faults are caused by wiring or grid conditions rather than the inverter itself. When the unit has failed, a string inverter replacement typically runs $1,000 to $2,500 installed and a hybrid inverter $2,000 to $4,500.
What the job is
What inverter repair and replacement covers
A string or hybrid inverter converts the panels' DC power to household AC and talks to the grid. It works hard, runs warm, and its electronics age faster than the panels. Faults can come from inside the inverter or from what is connected to it: a ground fault on a string, a grid voltage problem or a tripped breaker.
We separate those before replacing anything. The fault log, string tests and a grid check usually show whether the inverter is the problem. If it is, we check the warranty, file the claim if it applies, and plan a replacement that matches the array.
What you might notice
Signs your inverter needs attention
Red or amber light
A status light that is no longer green, or a blinking error.
Error code on the display
Codes for ground faults, grid faults or internal errors.
Blank screen in daylight
No display and no output on a sunny day.
Clicking, buzzing or a burning smell
Unusual sounds or smells near the unit. Shut down and call.
Monitoring shows zero for the whole system
Not one panel, the whole system offline.
Step by step
How an inverter repair runs
Call with the code
A photo of the display or the light tells us a lot.
Remote check
Monitoring and fault history reviewed if you can share access.
Testing on site
Strings, grid voltage, breakers and the inverter tested.
Repair, claim or replace
Repair where possible, warranty claim where it applies, replacement otherwise.
Permit and records
Replacements permitted and utility records updated as required.
Restart and verify
System restarted and production confirmed in monitoring.
Inside this job
String inverter replacement
When a string inverter fails out of warranty, we replace it with a current model sized for the array. The panel strings have to fit the new inverter's voltage window, and the mounting, disconnects and monitoring may change with it. Replacements usually need a permit and an update to the utility's records. If a battery is likely in the future, it can make sense to choose a hybrid model now.
Hybrid inverter faults
Hybrid inverters manage panels, a battery and the grid, so their faults can come from any of the three. A battery communication error, a backup switching fault or a firmware mismatch can all stop the system. We read the hybrid's logs, check the battery and gateway connections, update firmware and test the backup transfer before deciding whether hardware has failed.
Reading inverter error codes
Every maker uses its own codes, but most fall into a few groups: ground or insulation faults, grid voltage or frequency faults, overtemperature, and internal hardware errors. Ground faults point to the array wiring, grid faults often to the utility side, and overtemperature to ventilation. Internal errors are the ones most likely to mean replacement. Send us a photo of the code and we can usually narrow it down before we arrive.
Do it yourself or call
What you can check safely
| Task | Safe for an owner | Needs our crew |
|---|---|---|
| Note the light color and error code | Yes, take a photo | Interpreting the code against string tests |
| Check the solar breaker in the main panel | Yes, see if it is tripped | Resetting it more than once |
| Clear leaves or boxes from around the inverter | Yes, it needs airflow | Opening the inverter case |
| Restart the inverter | Only if the maker's guide gives the steps | Anything involving the DC side |
Washington conditions
Replacing an inverter on a DC system
Every DC solar install carries a building permit and a Pepco interconnection agreement, and a replacement inverter has to fit inside that paperwork. A like-for-like swap is usually simple; a different size, a hybrid model or an added battery generally means updating the permit and the interconnection. We check what the change requires before ordering the unit, so the new inverter is not left waiting on paperwork after it is on the wall.
String and hybrid inverters we service include SMA, SolarEdge, Fronius and Tesla units, plus older models from makers that have since left the residential market.
What moves the price
What decides the cost
- Repair or replaceFuses, fans and firmware cost far less than a new unit.
- Warranty statusUnits under warranty are claimed; labor coverage varies by maker.
- Inverter typeHybrid units cost more than string inverters.
- PaperworkA different size or type may mean a permit and interconnection update.
2026 planning ranges
- String inverter replacement, installed$1,000 to $2,500 installedSource: greenlancer.com
- Hybrid inverter replacement, installed$2,000 to $4,500 installedSource: greenlancer.com
- Minor inverter repairs$150 to $400Source: greenlancer.com
Published market ranges, not our quote. Your price depends on the roof, the equipment and the permit path.
Straight answers
Solar Inverter Repair & Replacement questions we hear in DC
String inverters usually need replacing well before the panels do, often somewhere in the second decade. Microinverters and optimizers tend to last longer.
Sometimes. Fuses, fans, firmware and wiring faults can be fixed. Internal hardware failures usually mean replacement.
Many come with a 10 year warranty or longer. We check the serial number and file the claim if it is covered.
If a battery is likely in the next few years, replacing a failed string inverter with a hybrid can save work later.
Often yes, especially if the size or type changes. We handle it.
It means current is leaking where it should not. Leave the system off and call; we trace it to the wiring before restarting.
Related work
Jobs that often come up alongside this one
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See this job about Solar Panel RepairMicroinverter & Optimizer Replacement
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See this job about Low Solar Production DiagnosticsRoof Leak Repair Around Solar Mounts
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