Solar Inverter Replacement: Signs, Cost, and What to Expect
If your panels look fine but production is at zero, you probably need a solar inverter replacement. The inverter is the hardest-working part of a solar system — and the first to wear out. We diagnose the fault, check your warranty before you pay for anything, and replace the unit with a flat written quote. Any brand, any installer, anywhere in LA and the San Fernando Valley.
Why inverters fail before panels do
Panels are glass and silicon with no moving parts — they routinely last 25 years or more. The inverter is power electronics converting DC to AC all day, every day, usually mounted in a hot garage or on a sun-baked wall. Valley summers don't help.
String inverters typically last 10–15 years. That means most solar systems will need one inverter replacement in their lifetime. It's normal wear, not a defect — budget for it the way you'd budget for a water heater.
String inverters vs microinverters
Which kind you have changes what failure looks like — and what replacement costs.
String inverter
- One box on your garage or side wall; the whole array runs through it
- When it fails, the entire system stops — hard to miss
- Typical manufacturer warranty: 10–12 years
- Replacement is usually a straightforward single-day swap
Microinverters
- A small inverter under each panel, converting on the roof
- One failure takes down one panel — the rest keep producing
- Commonly warrantied for 25 years
- Single failures are easy to miss without monitoring — a slow leak in your production
Signs your inverter is failing
- A red or flashing fault light, or an error code on the display
- Zero production in the middle of a sunny day
- The system restarts over and over, or production looks like a sawtooth
- Gaps or flatlines in your monitoring history
- Unusual buzzing, clicking, or humming from the box
- A burnt smell or scorch marks near the inverter — shut the system off at the breaker and call immediately
Not sure the inverter is the culprit? Wiring, breakers, and panel faults can mimic inverter failure. Our solar panel repair diagnostic isolates the actual failed component before you spend anything on hardware.
Check your warranty before you pay for anything
This is where homeowners get burned. Inverter manufacturer warranties often cover the replacement unit — but not the labor to swap it or the shipping to get it to you. Some brands require the claim to come through a certified installer. We check your model and registration first, so you never buy hardware the manufacturer owed you for free.
If your original installer went out of business, the workmanship warranty likely died with them — but the manufacturer's equipment warranty usually survives, and we can process the claim as part of the replacement. More on that in our guide to what to do when your solar company goes out of business.
Solar inverter replacement cost
Typical Southern California market ranges — a reference point, not a quote:
- String inverter: $1,500–$3,000+ installed, depending on system size and brand
- Single microinverter or optimizer: $300–$700 installed, most of which is the roof visit
- Under warranty: often labor and shipping only
A full retrofit from string to microinverters costs meaningfully more and only pays off in specific situations — shading, expansion plans, or panel-level monitoring you'll actually use. We'll price both paths and tell you plainly which one we'd pick for your roof. After the swap, an occasional checkup keeps the rest of the system honest — see solar panel maintenance or browse all solar services.
Inverter replacement FAQs
How much does it cost to replace a solar inverter?
Typical Southern California market ranges: $1,500 to $3,000 or more installed for a string inverter, depending on size and brand, and $300 to $700 installed for a single microinverter. If the unit is still under manufacturer warranty, you often pay only labor and shipping. You get a written quote after diagnosis, before any work.
How long do solar inverters last?
String inverters typically last 10 to 15 years. Microinverters usually carry 25-year warranties. Panels commonly last 25 years or more, so most solar systems will outlive their first inverter — replacing it once is normal, not a sign of a bad system.
Can I keep running my system with a failing inverter?
You can, but you should not. A struggling inverter usually means lost production you are paying the utility for, and some faults — like repeated ground faults — are safety issues. Have fault codes looked at promptly.
Should I switch from a string inverter to microinverters?
Usually a like-for-like string replacement is the cheaper, simpler fix. Microinverters are worth considering if you are adding panels, fighting heavy shading, or want panel-level monitoring — but the retrofit costs more. We will show you both numbers and let you decide.
Is inverter replacement covered by my warranty?
Often partly. String inverters typically carry 10 to 12 year manufacturer warranties and microinverters 25 years — the unit may be covered while labor and shipping are not. If your installer went out of business, the manufacturer warranty usually still stands, and we can help you claim it.
Get your inverter diagnosed
Send us the brand, the fault code, and a photo of the unit. We'll check your warranty coverage and quote the replacement in writing.