Solar panel maintenance in California: what it takes and who to call

Start with the money: is it the panels, or is it the bill?

Most people searching for solar maintenance are not looking at a broken array. They are looking at a bill that got worse and assuming the panels must be the reason. Separating the two is free, it takes about ten minutes, and it decides whether you need a contractor at all. Do it before you pay anyone.

Start with what a lost kWh is actually worth. California’s bundled residential average rates, as reported by the CPUC Public Advocates Office, were 33.7¢ per kWh at PG&E, 34.4¢ at SCE and 45.5¢ at SDG&E, all excluding the California Climate Credit. CPUC Public Advocates Office·checked Nov 9, 2026 Those averages let you price a performance problem before you pay anyone to look at it.

Now look at the bill itself. A higher bill on a healthy system almost always comes from one of five things, none of which a roof visit fixes: a rate increase, a change of rate plan or time-of-use hours, a fixed monthly service charge, a different export credit structure, or twelve months of netting landing at once in a true-up. The utilities publish their own walk-throughs of a solar statement — PG&E’s solar bill explainer, SCE’s guide to a net energy metering bill and SDG&E’s NEM bill guide — and the CPUC explains how net energy metering and net billing differ. CPUC·checked Sep 23, 2026

If after all that the bill still looks wrong rather than merely high, the CPUC publishes the route for a disputed utility bill. CPUC·checked Sep 23, 2026 Our own guides cover the three complaints that bring most existing-system owners here: why a bill is still high with solar, what a true-up bill is and why a utility bill arrives at all. If your evening usage is what the bill is punishing, adding storage to an existing array is a different fix from any repair; see adding a battery to an existing system.

One sentence is worth keeping in mind through all of this: a rate problem and a hardware problem feel identical on a bill, and only production data tells them apart.

What maintenance does a California solar system need, and how often?

A rooftop system has no moving parts, so the care it needs is mostly checking, plus the occasional repair. The California Public Utilities Commission’s consumer guide puts the responsibility plainly: “Unless you purchase a maintenance plan or your system comes with one, you will be responsible for any maintenance and repairs.” CPUC·checked Sep 23, 2026

Here is the whole list for an owned home system.

Two things are worth saying about that list. The first is that nothing on it requires a ladder. The second is that the expensive items are electrical, not cosmetic: NREL’s operation and maintenance guide names inverter failure among the most frequent causes of lost PV system performance. NREL·checked Sep 23, 2026

What to check yourself before you call anyone

Most service calls on a healthy system are avoidable, and most real faults show themselves in the data before anyone climbs on the roof. Work through this from the ground, in order, and write down what you find.

1. Confirm the drop is real. Compare the same month last year, not last month. Output falls every autumn in California on its own.
2. Decide whether it is the whole system or part of it. The monitoring app usually shows per-panel or per-string output. This single question narrows the cause more than anything else you can do.
3. Look at the inverter. Note any fault code or warning light exactly as it reads. Follow only the reset steps printed in your inverter manual.
4. Check the breakers. A solar or inverter breaker in the main panel or an AC disconnect can trip and stop production entirely.
5. Check whether monitoring itself is down. A dead Wi-Fi link or an expired gateway shows as zero production from a system that is actually working. The utility meter will disagree with the app.
6. Look at the array from the ground. Debris, a tarp, new shade, bird nests, cracked glass, hanging wiring, scorch marks.
7. Look at the bill. If production is normal and the bill is what changed, it is a rate or billing question, not a repair.

Those seven steps are what a good technician asks you on the phone anyway. Having the answers shortens the visit and keeps a diagnostic call from becoming an open-ended one. A deeper walk-through of the order to check things is in what to check when panels under-produce.

Reading an output drop: symptom, likely cause, what to check

An output drop has a shape, and the shape points at the cause. Find the row that matches what your monitoring shows.

Monitoring is the maintenance that matters most

The CPUC tells buyers to ask, before signing, “Will I be able to monitor the performance of the system once it’s installed? If so, how?” Once the system is running, that app is how you notice a problem in days instead of at the annual true-up bill, and the difference between those two is months of lost output you never get back.

Three habits make monitoring worth having:

• Compare like with like. Month against the same month last year. Lower output in December is not a fault.
• Turn on alerts if the platform offers them. A fault email is worth more than a dashboard you remember to open twice a year.
• Keep the login. Monitoring accounts are often set up in the installer’s name. If that company closes, an account you cannot access is a system you cannot diagnose.

It also helps to know roughly what your household should be using, so an odd bill separates into a usage question and a production question. Typical California figures are in average kWh per day and per month in California.

Cleaning: in most of California, rain does most of it

The best California evidence on dirty panels is a UC San Diego study of 186 home and business systems, from the Bay Area to the Mexican border, using 2010 data. Panels lost a little under 0.05 percent of efficiency per day without rain, and those left unwashed through a 145-day summer drought lost 7.4 percent. For a typical 5 kW home system, washing halfway through summer was worth about $20 of electricity, and the researchers concluded most homeowners “won’t get their money back” paying someone to wash the panels (UC San Diego, July 2013). UC San Diego·checked Sep 23, 2026

The same researchers named the exceptions: panels heavily soiled by bird droppings, panels tilted less than five degrees, and homes directly beside a highway, factory or farm operation. If your roof fits one of those, or your monitoring shows a dry-season loss that a rain clears, cleaning can pay. The how, the risks and the warranty rules are in our solar panel cleaning guide, and birds nesting under the array are covered in the bird-proofing guide.

What you can do yourself, and what needs a licensed contractor

Most solar upkeep is looking, not touching. The line to hold is the roof edge and the equipment cabinets: anything on the array, the wiring or the inverter is solar work under California license law. CSLB describes C-46 solar contractors as the class that may “install, modify, maintain, and repair” solar energy systems. CSLB·checked Sep 23, 2026 LADWP’s rules for the systems it owns on customers’ roofs put the safety reason plainly: owners must not open system cabinets or touch exposed wiring, because “hazardous voltages can be present throughout the entire system at any time.” LADWP·checked Sep 23, 2026

A year of solar upkeep in California

California’s long dry season and its winter rains set a natural rhythm. None of these steps needs a ladder.

• Late summer and early fall, before the rains: compare output with last year. This is when dust has built up longest, so it is the one time a cleaning might pay.
• After the first real storm: check that output recovered. UC San Diego’s study used more than 0.1 inch of rain as the point that cleaned panels. UC San Diego·checked Sep 23, 2026
• Winter: expect lower numbers from shorter days; look for storm damage and debris instead.
• Spring: trim trees before the growing season adds shade, and look for birds nesting under the array.
• Fire season: after nearby fires, look for ash on the glass and damage to exposed wiring.
• At your annual true-up: read the bill against a year of production, and confirm your warranty papers and monitoring login still work.

Inverters: the part most likely to need replacing

If a home system has one predictable repair, it is the inverter. NREL’s best-practices guide names inverter failure among the most frequent causes of lost PV system performance, and reported in December 2018 that 10-year inverter warranties were then commonly available, with 20-year extended warranties and service plans gaining ground. NREL·checked Sep 23, 2026 Set that against panel life: the U.S. Department of Energy says panels last about 25 to 30 years. energy.gov·checked Sep 23, 2026 The arithmetic of those two numbers is the whole point — the electronics will almost certainly need attention before the glass does.

No public agency publishes an average inverter service life, so this guide does not print one. What you can do is act on the warranty dates you actually have:

• Find the inverter warranty term and its end date, and put it on a calendar.
• Check whether the warranty covers labor and shipping, or only the part.
• Register the equipment if the maker requires registration for coverage.
• Ask for a replacement price before the warranty expires, so the bill is not a surprise.

A string inverter, microinverters and optimisers fail and get repaired differently; string inverters versus microinverters compares them, the inverter explainer covers what the part does, and what a replacement inverter costs walks through a quote.

Maintenance and service contracts: what they typically cover

A maintenance plan is only worth buying for what your warranties leave out. Lay the two side by side before you sign, and ask about each of these.

Warranties: which one covers what

A home system usually carries several warranties from different companies, and each answers a different question. Two of the CPUC’s buyer questions go straight at them: “Are there warranties for the panels and inverters?” and “What is your typical response time via phone or email?” CPUC·checked Sep 23, 2026 Ask for the term, and for the name of whoever handles a claim.

Before you let anyone else touch the array, ask the installer in writing whether it would affect the workmanship warranty.

What to do when the original installer is gone

This is the most common hard case on an older California system, and it is not hopeless. Equipment warranties are usually issued by the panel and inverter manufacturers, not by the installer, so a closed installer does not automatically end your coverage. What generally does end is the workmanship warranty on the installation itself.

1. Find the paperwork first. The contract, the equipment list with model and serial numbers, the permit and the monitoring login. Serial numbers are what a manufacturer warranty claim turns on.
2. Go to the manufacturer directly. Ask whether the part is in warranty and whether they have an authorised service company in your area.
3. Take control of the monitoring account. Get it into your own name and email while you still can.
4. Hire on license, not on sales pitch. Search the C-46 solar class, and C-10 electrical for inverter and wiring work, and check the license before anyone goes on the roof.
5. Ask the new contractor the awkward questions. Do you service systems you did not install, and this inverter and panel brand? Is the first visit a flat diagnostic fee, and does it apply to the repair? Will you file the warranty claim with the manufacturer, and who pays the labor if the part is covered? What warranty do you give on your own work and on any new roof penetrations?
6. Keep the complaint route open. CSLB handles violations of contractor license law “for up to four years from the date of the act,” whether the contractor is licensed or not. CSLB·checked Sep 23, 2026

Before anyone goes on the roof, run the company through CSLB’s license check, which looks a contractor up by license number, business name or personnel name and returns the license record, including the classifications that license actually holds. CSLB·checked Nov 9, 2026 Our pages on finding licensed solar installers by county and how to verify a solar contractor walk through the same lookup. If your installer specifically went under, the steps in what to do when a solar installer goes bankrupt and the Freedom Forever bankruptcy walk-through apply to your warranties too.

Inspections: when a professional look is worth it

A system that produces what it did last year rarely needs a paid inspection. Four moments justify one: output has fallen and you can’t find why, a storm or fire may have damaged the array, you are buying a home that already has solar, or a roofer is about to work around the panels. What an inspection covers and how it is priced is in our solar panel inspection guide.

Hire someone licensed for the work. The Contractors State License Board lists the classes that may install solar, and describes C-46 solar contractors as those who “install, modify, maintain, and repair” solar energy systems; C-10 electrical contractors are also on its list. Its advice is blunt: “Do not use a contractor who is not licensed to perform solar work.” CSLB·checked Sep 23, 2026

Repairs: inverters, panels, wiring and roof penetrations

Most repair bills come from the electronics, not the glass. Microinverters, optimisers, connectors, conduit and the flashing around roof mounts are the usual suspects after the inverter itself, and rodents and birds can damage wiring under the array.

What a repair costs depends on the part, whether a warranty covers the part and the labor, and whether panels must come off to reach it. What drives solar panel repair cost walks through each case. If a leak shows up under the array, go straight to what to do about a roof leak after solar.

Trees, shade and California’s Solar Shade Control Act

A tree that grows into the sun path cuts output every day, which makes shade the one maintenance issue that gets worse on its own. Trimming your own trees is ordinary upkeep. A neighbor’s trees are covered by a state law with a narrow reach.

Under the Solar Shade Control Act, once a solar collector is installed, a person who owns or controls another property may not let a tree or shrub be placed or grow there so that it shades more than 10 percent of the collector area at any one time between 10 a.m. and 2 p.m., local standard time. Public Resources Code § 25982·checked Sep 23, 2026 Such a tree becomes a private nuisance only if the owner fails to remove or alter it after receiving a written notice from the solar owner. PRC § 25983·checked Sep 23, 2026

The limits matter as much as the rule:

• It does not apply to a tree or shrub planted before the solar collector was installed. PRC § 25984·checked Sep 23, 2026
• It does not apply to trees on timberland or commercial farmland, or to trees covered by a city or county ordinance.
• A city, or a county for unincorporated areas, may adopt an ordinance exempting itself, and a local tree-preservation or solar-shade ordinance governs where one exists. PRC § 25985·checked Sep 23, 2026

Keep the permit or installation date, and photos of the neighboring trees at that time; they are what the law turns on. If production has fallen and you suspect shade, confirm it in your monitoring data first, following the checks for panels that under-produce.

Removing and reinstalling panels for roof work

A new roof under an existing array means the panels come off and go back on. The CPUC suggests asking before you sign: “Roughly how much will it cost to remove and re-install the panels if I need to replace my roof in the future, including inspection fees?” The U.S. Department of Energy says panels last about 25 to 30 years and a roof 20 to 50 years depending on material, and that doing both together avoids a later reinstall. energy.gov·checked Sep 23, 2026

Who may do the work, what the quote should itemize and how leases handle it are in solar panel removal and reinstall costs. Tile roofs add their own steps; see solar on clay and concrete tile roofs. For the roof itself, start with whether your roof is ready for solar.

Leased, PPA and utility-owned systems

When a company owns the panels on your roof, service is normally that company’s job, but the contract decides the details, including whether cleaning is left to you and who pays to remove panels for a new roof. How solar leases and PPAs work covers the contract terms.

LADWP’s Solar Rooftops program is one example of a utility-owned system: LADWP designs, installs and owns the panels, and pays the homeowner for the roof space. LADWP·checked Sep 23, 2026 Its program rules tell homeowners not to repair the equipment themselves and to phone LADWP with any problem. LADWP·checked Sep 23, 2026 The terms are in our LADWP Solar Rooftops guide.

Who to call for each problem

CSLB handles violations of contractor license law “for up to four years from the date of the act,” whether the contractor is licensed or not. CSLB·checked Sep 23, 2026 For money you want back, CSLB points people with damages of $12,500 or less to small claims court and tells those above that to consult an attorney. CSLB·checked Sep 23, 2026 Our guides on what to do when a solar contractor took your money, finding an attorney for a solar dispute and how solar lawsuits work in California cover the next steps.

What maintenance costs, in round terms

NREL’s Annual Technology Baseline (2024 edition) puts residential operation and maintenance at $30 per kW of panels per year for 2023, and says the cost can range from $0 to $40 per kW a year. What it counts in that figure is asset management, including compliance and reporting for incentive payments, plus insurance products, cleaning, vegetation removal and component failure. NREL·checked Sep 23, 2026 On a 7 kW system, $30 per kW is $210 a year, averaged over years with and without repairs.

No public agency publishes California prices for a cleaning visit, a panel swap or a remove-and-reinstall job, so this site does not print price ranges for them. The drivers are predictable, though: roof height and pitch, tile versus shingle, panel count, whether a warranty covers labor, permits, and travel. Get the scope and the price in writing. The companion page, solar panel maintenance and cleaning costs in California, is where the money side lives: it applies the NREL benchmark to common system sizes, lists what a cleaning quote should itemise and shows how to work out whether a wash pays for itself. This page stays with the work itself and the diagnosis.

Batteries and end of life

A home battery adds equipment to monitor and its own warranty to keep. If you are adding one to an existing system, the California home battery guide covers sizing and cost. When panels near the end of their service life, output keeps falling slowly rather than stopping; see how long solar panels last and what happens after 25 years. Old panels can’t simply go in the trash bin: California’s hazardous waste rules list photovoltaic modules as a universal waste, a category operative since January 1, 2021. 22 CCR § 66261.9·checked Sep 23, 2026 Ask whoever removes old panels, in writing, where they will go; the removal guide covers taking a system off for good.

Every solar maintenance guide on this site

Care, cleaning and inspection

• Solar panel cleaning in California: when washing pays, safe methods and warranty rules.
• Solar panel inspections: what an inspection checks and when to book one.
• Bird proofing under panels: nesting, droppings and mesh guards.

Costs

• Maintenance and cleaning costs: NREL’s upkeep benchmark and what drives a quote.
• Repair costs: inverters, panels, wiring and who pays under warranty.
• Replacement inverter cost: what goes into the quote for the part most likely to fail.
• Removal and reinstall costs: roof replacement, moving panels and quote checklist.

Performance problems

• Panels not producing enough: the order to check causes.
• Winter production drop: what is normal in California.
• Panel degradation: the slow decline over decades.
• String inverters vs microinverters: how each fails and gets fixed.

Bills and rates on an existing system

• Bill still high with solar: the reasons that are not the panels.
• True-up bill explained: how a year of netting arrives at once.
• California utility rate tracker: current residential rates by utility.
• Average kWh per day in California: what normal household usage looks like.

Roof and structure

• Roof leak after solar install: first steps and who is responsible.
• Roof replacement offers bundled with solar: what to verify.
• Tile roofs and flat roofs: mounts, breakage, ballast and the extra upkeep low-tilt panels need.
• Homeowners insurance and solar: what a policy covers.