Central Valley dust, almond pollen, and summer haze cost Fresno homes 5 to 15 percent annual production. Professional cleaning and system checks restore that.
Fresno County sits at the intersection of three conditions that hammer solar panels harder than most California regions:
Studies in similar climates (Bakersfield, Phoenix, southern San Joaquin Valley) consistently show 5 to 15 percent production loss between professional cleanings. For a typical 8 kW Fresno home solar system producing ~12,000 kWh/year and saving roughly $3,000/year on the PG&E bill, that loss equals $150 to $450 per year.
Our standard maintenance visit (typically scheduled annually in late spring or early summer):
Soft-bristle equipment, deionized water (no streaking, no mineral residue), no detergents that could void warranty. Done early morning or late evening to avoid thermal shock on hot panels. Every panel inspected and cleaned individually.
Panel surface for hot spots, micro-cracks, delamination, or discoloration. Racking and mounting hardware for corrosion or loose fasteners. Conduit for UV damage or rodent chewing. Junction boxes for water intrusion. Roof penetrations for sealant condition.
String inverter status lights, fault codes, ground fault detection. For microinverter or hybrid systems, individual unit health pulled from monitoring portal. Production data reviewed against the seasonal expected curve.
For homes with Powerwall, Enphase, or FranklinWH battery: state of health, cycle count, app status, backup load circuit verification.
Fresno-specific concern: ground squirrels, roof rats, and birds nesting under panels. We check for activity and recommend critter guards if needed (typically a one-time $1,500-$3,500 install that pays for itself in avoided repair costs).
What we found, what we cleaned, any items that need attention, and recommended next visit date. Production baseline for comparison next year.
Enphase microinverters have a 25-year warranty, but failures do occur. Symptoms: one or two panels reporting zero or significantly reduced production. We diagnose via the monitoring portal and file warranty replacement when applicable.
SolarEdge, SMA, Fronius, and ABB string inverters typically last 10 to 15 years. Out-of-warranty replacement runs $1,800 to $4,500 depending on size. We can replace with the same brand or convert to a microinverter system depending on what makes sense.
Ground squirrels in particular love the warm space under panels and will chew through wiring, conduit, and panel backsheets. Annual visual inspection catches problems early. Critter guards prevent recurrence.
Sometimes the PG&E meter loses its data link with your inverter. Production is fine but your bill spikes because PG&E does not see your generation. We diagnose and reset.
Pigeons and crows love roosting under panels. Droppings accelerate panel degradation and create roof concerns. Inspection and seasonal cleaning prevent this.
Two ways to engage:
You call us when you notice an issue or want a cleaning. Single visit, single invoice. Good for homeowners who prefer no recurring commitment.
Scheduled annual visit (usually late spring), priority response for any issues, discount on parts and labor for warranty-out repairs. Most cost-effective for homeowners who want set-and-forget peace of mind.
We service solar systems from these Central Valley cities and surrounding rural areas: Fresno, Clovis, Madera, Visalia, Tulare, Hanford, Lemoore, Sanger, Reedley, Selma, Kingsburg, Dinuba, Fowler, Parlier, Kerman, Mendota, Firebaugh, Coalinga, Riverdale, Merced, Atwater, Los Banos, Chowchilla, Oakhurst, Coarsegold, Mariposa, Auberry, and Tollhouse. If you are unsure, just ask.
Yes - more than most California regions. Central Valley dust, almond bloom pollen in February and March, summer haze, and ag burn season residue all coat panels in a measurable way. Studies in similar climates show 5 to 15 percent production loss between cleanings. For a typical Fresno 8 kW system, that is roughly $150 to $400 per year in lost generation - more than the cost of an annual professional cleaning.
Most Fresno homes do well on a once-a-year professional cleaning, typically scheduled in early summer (after almond bloom season ends but before peak production). Homes near agricultural operations, ranches, or unpaved roads benefit from twice-yearly cleaning. Homes in urban Fresno or northeast Clovis can sometimes stretch to every 18 months.
You can, but most Fresno panel manufacturers recommend against pressure-washing or scrubbing because both can void the panel warranty. The safe DIY method is soft-bristle brush with deionized water on a cool day (before 9 AM or after 6 PM, never midday when panels are hot). NMS's professional cleaning uses deionized water and soft-bristle equipment that meets every manufacturer's warranty requirements. Most homeowners find the time and roof-safety equation favors hiring it out.
Our annual maintenance package includes: full panel cleaning with deionized water; visual inspection of all panel, racking, and conduit connections; inverter status check (string inverter or microinverter health); production data review against expected output for the season; battery health check if you have storage; squirrel/rodent guard inspection (a real Central Valley concern); and a written report of findings.
Most common causes in Fresno: (1) accumulated soiling - solvable by cleaning; (2) a failed microinverter or string inverter - solvable by replacement (often under warranty); (3) shading from new tree growth - solvable by selective trimming; (4) a tripped breaker or PG&E communication issue - solvable in 10 minutes by an electrician. Our diagnostic visit identifies which of these you are dealing with before we quote any repair.
Yes. We service any Fresno-area solar system regardless of original installer, brand, or age. Warranties from the original installer or manufacturer may still apply for repairs - we honor those when documentation is available. Our maintenance visits are no-pressure: we tell you what we found, what is fine, and what (if anything) actually needs work.
Takes 60 seconds · No obligation · Licensed & insured
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Net Metering Systems
55 E Shaw Ave #201
Clovis, CA 93612
