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If the pitch starts at your door and ends with "sign tonight for the special," sleep on it. The sun will still be there tomorrow; so will we.
Before
After
Before
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Before
AfterFast, Reliable Solar Panel Cleaning Across Napa
Solar panel cleaning in Napa typically costs between $150 and $450 for a residential array, and most jobs are completed the same week we hear from you. Dirty panels on a Napa roof lose real production, often 5 to 15 percent depending on the season, and that lost production shows up directly on your true-up statement. Gus’s Solar has cleaned residential and commercial arrays across 94558, 94559, and 94581 for years, and we know exactly what Napa’s dry-season dust, harvest particulates, and morning fog do to glass. Call (877) 550-6892 for a straight quote from Gus Petrakis himself. He answers his own phone.
Why Gus’s Solar Is Napa’s Preferred Solar Panel Cleaning Company
Gus Petrakis founded Gus’s Solar in 2011 and runs it the way Napa County runs a good vintage: name on the label, accountable for every step. When you call, a live person picks up, 24/7, not a voicemail or a ticketing queue. That matters when you’re looking at a production monitor that’s dropped 8 percent since crush season and you want someone to explain why.
Our Solar Panel Cleaning team is background-checked, uniformed, and familiar with Napa’s mix of housing stock. We know the Craftsman and Victorian rooflines near Old Town have steeper pitches and older flashing that need a lighter touch. We know the postwar ranch homes and 1970s tract builds south and east of downtown sit under the same marine fog layer that rolls through the Carquinez Strait most summer mornings. That fog matters: a cleaning crew that starts too early soaks the panels, and streaks bake on hard once the afternoon heat hits. We schedule around it.
Every cleaning job carries Gus’s 90-Day Done Right Promise in writing. If something isn’t right, one call brings him back. The price we quote is the price you pay. No signature wanted tonight, no pressure, ever.
Our Solar Panel Cleaning Services in Napa
Residential Panel Cleaning
Napa homes collect a specific kind of grime: dry-season dust from vineyard roads, pollen from valley oaks, and a fine film from morning fog that leaves mineral residue when it burns off. A standard residential array in Napa, usually 16 to 28 modules, takes our crew about two hours on site. We use deionized water and soft brushes, never pressure washers. Pressure washing etches the glass and voids the manufacturer’s warranty, and we see that mistake often enough that it’s worth saying plainly.
Commercial Array Cleaning
This is where Napa’s wine industry changes the math. Barrel-room roofs, fermentation buildings, and crush-pad structures carry large arrays that run refrigeration, cave ventilation, and tasting-room loads year round. During crush, grape-press particulates and sugar-laden dust settle on panels fast. We cleaned a 240-module array on a winery’s barrel-room roof near Old Town Napa in 94558 where months of dry-season dust and press particulates had cut production past the 0.5% annual degradation rate. Our crew used deionized water and soft brushes to restore the panels to their warranty-year-25 output, then installed critter guard mesh to keep sparrows out of the microinverter wiring. A scheduled commercial plan in Napa typically runs $800 to $2,400 per cleaning depending on array size and access.
Bird & Critter Guard Installation
Sparrows, pigeons, and ground squirrels are persistent under Napa panels. Birds build nests along the microinverter wiring and under the racking rails, and the droppings corrode connections and create hot spots on the modules. Critter guard mesh installed around the perimeter of the array stops this before it starts. For a typical residential array in Napa, installed mesh costs between $400 and $900. For a winery roof array, plan on $1,200 to $3,500 depending on linear footage and how much old nesting material our crew has to remove first.
Debris & Soiling Removal
Napa’s dry summer means almost no rain from June through September, so whatever lands on your panels stays there. Dust, ash from occasional wildfire smoke, harvest particulates, and bird droppings accumulate week over week. Post-storm cleanings in winter are the other side of the same coin: atmospheric river events leave mud streaks and leaf debris that shade cells unevenly. A debris and soiling removal visit in Napa runs $120 to $260 for most homes, and we recommend it at least twice a year for valley-floor arrays where morning fog leaves residue that doesn’t rinse off on its own.
We also offer scheduled cleaning plans for homeowners and winery accounts alike. Plans lock in pricing, guarantee spring and fall visits, and include a free production check each visit. For a Napa residence, a twice-yearly plan typically runs $280 to $480 annually. For commercial accounts, we quote per array.
What happens when you call
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A real person answersNo phone trees - you reach a local pro.
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You get an upfront price rangeHonest numbers before anyone is dispatched.
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A background-checked tech heads outLicensed & insured, dispatched right away.
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You approve before work beginsNothing starts until you say go.
Trusted Brands We Service in Napa
We clean and maintain arrays from Qcells, REC, SunPower, and Panasonic, among others. Napa installers have used all of these brands on valley roofs and barrel buildings over the years, and our crew knows the mounting hardware, rail spacing, and microinverter layouts for each. We carry the right cleaning solutions and soft-brush heads for anti-reflective coated glass, which some older panels lack and some newer ones need treated with care. You don’t need to know your panel brand to call us. But if you do, we’ll work with it properly.
Common Solar Panel Cleaning Problems We See in Napa Homes
- Morning fog residue that bakes on hard. The Carquinez Strait fog layer rolls in most summer mornings and leaves a mineral film when it lifts. If panels aren’t cleaned with deionized water, that film streaks and hardens in the afternoon heat, reducing output further than the original dust did.
- Crush-season soiling on winery-owned residential arrays. Many vineyard owners live on site with a residential array near the crush pad or barrel building. Harvest dust and grape-press particulates drift onto these panels for six to eight weeks straight, and skipping a post-harvest cleaning means carrying that production loss through the winter.
- Bird nesting under panels near Old Town and the river. Mature trees, the Napa River corridor, and older rooflines create ideal nesting conditions. Sparrows and pigeons work into the gap under the modules, and droppings corrode microinverter housing and cause fault codes that don’t show up until your production has already dropped.
- Overgrown trees and valley oaks shading panels unevenly. Napa’s older neighborhoods have mature oaks and redwoods that grew up around early solar installs. Shading from one overgrown limb can cut a string’s output by half, and the problem compounds when dust accumulates on the shaded, cooler cells. We flag this on every cleaning visit.
Pricing for Solar Panel Cleaning in Napa, CA
A residential panel cleaning in Napa runs $150 to $450 for most homes. That covers a full deionized-water wash, soft-brush scrub, and a visual inspection of racking, wiring, and microinverters. Commercial arrays on the valley floor start around $800 and go up from there with array size and roof access. Critter guard installation adds $400 to $3,500 depending on perimeter footage and cleanup required. Scheduled plans for Napa homeowners typically run $280 to $480 per year for two cleanings and two production checks. We offer free estimates, no trip charge inside Napa County, a senior and veteran 10 percent discount that never expires, and $40 off any repair over $200. Call (877) 550-6892 and Gus will give you a number off your actual bill, not a brochure.
We Also Serve Cities Near Napa
Beyond Solar Panel Cleaning in Napa, our crew regularly runs routes through Sonoma, Boyes Hot Springs, Fairfield, and American Canyon. If you’re on the edge of the valley or up against the county line, call (877) 550-6892 and ask if your address is inside our no-trip-charge boundary. Usually it is.
Serving Napa, CA - Our Local Coverage Area
We’re based in the Napa area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
FAQs - Solar Panel Cleaning in Napa
The fog layer that pulls through the Carquinez Strait most summer mornings leaves a mineral film on valley-floor panels. Cleaning early, before the fog lifts, streaks that film across the glass and it bakes on in the afternoon heat. The better schedule is to clean after the fog has burned off, usually by mid-morning, or to let the crew’s deionized water system handle the residue properly. Call (877) 550-6892 and we’ll schedule around the marine layer, not through it.
Yes. Winery roof arrays in Napa need more frequent cleaning because crush season adds grape-press particulates and sugar-laden dust to the normal soiling load, and the Agricultural Preserve’s roof-only constraint concentrates those arrays on buildings next to active crush pads and barrel rooms. Most winery accounts we serve schedule cleanings three to four times per year, with one booking immediately after harvest ends. For an exact schedule and quote for your array, call (877) 550-6892.
Yes, it can. Bird droppings corrode microinverter housings and cause fault codes, while nests packed against the wiring create hot spots that drag down string output. Every percent of production lost to soiling or shading comes straight out of your true-up credits at the end of the year. Installing critter guard mesh is the standard fix. Call (877) 550-6892 for a free estimate on mesh installation and a cleaning to remove whatever’s already under your array.
No permit is required for cleaning. The Agricultural Preserve rules govern new construction and land-use changes, not maintenance of an existing permitted array. Cleaning, critter guard installation, and routine maintenance all fall under standard upkeep and don’t trigger any Agricultural Preserve review. If you have questions about your specific parcel, Gus can walk you through it when you call (877) 550-6892.
Napa’s dry summer means panels sit under accumulating dust from late June through September with almost no rain to rinse them, while a city like Vallejo gets marine moisture that naturally washes panels more often. Soiling losses of 5 to 10 percent over a Napa summer are common without cleaning, and that extends your payback period by months or more depending on array size. A twice-yearly cleaning plan typically costs far less than the production you recover. Call (877) 550-6892 and bring us a bill. We’ll do the math with you.
If your panels haven’t been cleaned since last harvest, or since the fog lifted last summer, call Gus’s Solar at (877) 550-6892 today. A live person answers, the estimate is free, and there’s no trip charge inside Napa County. Take two weeks to think about it. The price will be the same.
Written by Gus Petrakis, Owner at Gus’s Solar, serving Napa since 2011.