Between 2023 and 2025, 1,532 home solar systems were installed in Fullerton by 253 different companies. Sunrun installed the most (255, or 17% of the local market), followed by Tesla (108) and Bright Planet Solar (73). 29% of the systems were leased or financed through a power purchase agreement; the rest were bought outright. Every company in the ranking was still installing in 2025; installers that have since closed are left out.
Top 10 Solar Companies in Fullerton by Home Installations
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Serves Fullerton, CA · no office address listed
- Most installations
- Mostly leases & PPAs
- Typical system
- 6.7 kW
- Median price (owned)
- $5.00/W
- Leased / PPA
- 87%
- With battery
- 71%
Sunrun mostly sells leases and power purchase agreements: 87% of its systems here were leased or on a PPA, so the homeowner pays monthly and doesn't own the panels. Its most common setup here pairs JA Solar panels with SolarEdge inverters with power optimizers. 71% of its systems here include a home battery. Its median price for an owned system, $5.00/W, is 25% above the Fullerton median of $4.00/W. A typical system is 6.7 kW, about 17 panels, and it has installed in Fullerton since 2000. It is also among the top installers in 107 other cities we rank, including Bakersfield and San Diego.
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Serves Fullerton, CA · no office address listed
- Mostly sells systems you own
- Most battery installs
- Typical system
- 9.2 kW
- Median price (owned)
- $3.95/W
- Leased / PPA
- 0%
- With battery
- 80%
Tesla mostly sells systems the homeowner owns, paid in cash or with a loan. Its most common setup here pairs Tesla panels with Tesla inverters. 80% of its systems here include a home battery. Its median price for an owned system, $3.95/W, is close to the Fullerton median. A typical system is 9.2 kW, about 23 panels, and it has installed in Fullerton since 2001. It is also among the top installers in 84 other cities we rank, including Fremont and Sunnyvale.
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Serves Fullerton, CA · no office address listed
- Mostly leases & PPAs
- Typical system
- 6.5 kW
- Leased / PPA
- 88%
- With battery
- 51%
Bright Planet Solar mostly sells leases and power purchase agreements: 88% of its systems here were leased or on a PPA, so the homeowner pays monthly and doesn't own the panels. Its most common setup here pairs Hanwha Q CELLS panels with SolarEdge inverters with power optimizers. 51% of its systems here include a home battery. A typical system is 6.5 kW, about 16 panels, and it has installed in Fullerton since 2001. It is also among the top installers in 69 other cities we rank, including Stockton and Chula Vista.
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- Mostly sells systems you own
- (949) 427-8817
- 240 Progress Suite 100, Irvine, CA 92618
- Typical system
- 8.4 kW
- Median price (owned)
- $3.79/W
- Leased / PPA
- 10%
- With battery
- 64%
Orange County Contracting Services mostly sells systems the homeowner owns, paid in cash or with a loan. Its most common setup here pairs Panasonic panels with Tesla inverters. 64% of its systems here include a home battery. Its median price for an owned system, $3.79/W, is 5% below the Fullerton median of $4.00/W. A typical system is 8.4 kW, about 21 panels, and it has installed in Fullerton since 2017. It is also among the top installers in 9 other cities we rank, including Huntington Beach and Orange.
Phone from its California contractor license, CSLB #1023627
- Map & reviews ↗
Elione Energy
- Mostly sells systems you own
- Lowest median price in this list
- (657) 255-4409
- elionesolar.com
- 6970 Aragon Cir #3, Buena Park, CA 90620
- Typical system
- 9.1 kW
- Median price (owned)
- $2.93/W
- Leased / PPA
- 0%
- With battery
- 24%
Elione Energy mostly sells systems the homeowner owns, paid in cash or with a loan. Its most common setup here pairs Hanwha Q CELLS panels with Enphase microinverters. 24% of its systems here include a home battery. Its median price for an owned system, $2.93/W, is 27% below the Fullerton median of $4.00/W. A typical system is 9.1 kW, about 23 panels, and it has installed in Fullerton since 2021.
Phone from its California contractor license, CSLB #1073542
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- Mostly sells systems you own
- (888) 373-9379
- betterearth.solar
- 16720 Marquardt Avenue, Cerritos, CA 90703
- Typical system
- 7.0 kW
- Median price (owned)
- $5.00/W
- Leased / PPA
- 10%
- With battery
- 23%
Better Earth mostly sells systems the homeowner owns, paid in cash or with a loan. Its most common setup here pairs Hanwha Q CELLS panels with SolarEdge inverters with power optimizers. 23% of its systems here include a home battery. Its median price for an owned system, $5.00/W, is 25% above the Fullerton median of $4.00/W. A typical system is 7.0 kW, about 18 panels, and it has installed in Fullerton since 2018. It is also among the top installers in 44 other cities we rank, including Fremont and San Bernardino.
Phone from its California contractor license, CSLB #1024460
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- (866) 865-4559
- 970 West 190th Street Ste 302, Torrance, CA 90502
- Typical system
- 7.1 kW
- Median price (owned)
- $4.43/W
- Leased / PPA
- 21%
- With battery
- 21%
ESP (Energy Service Partners) sells both: 21% of its systems here were leased or on a PPA, the rest bought outright. Its most common setup here pairs Aptos Solar panels with SolarEdge inverters with power optimizers. 21% of its systems here include a home battery. Its median price for an owned system, $4.43/W, is 11% above the Fullerton median of $4.00/W. A typical system is 7.1 kW, about 18 panels, and it has installed in Fullerton since 2014. It is also among the top installers in 36 other cities we rank, including Moreno Valley and Santa Ana.
Phone from its California contractor license, CSLB #619149
- Map & reviews ↗
Kbc Energy Group
Serves Fullerton, CA · no office address listed
- Typical system
- 9.7 kW
- Median price (owned)
- $3.15/W
- Leased / PPA
- 31%
- With battery
- 28%
Kbc Energy Group sells both: 31% of its systems here were leased or on a PPA, the rest bought outright. Its most common setup here pairs Hanwha Q CELLS panels with Enphase microinverters. 28% of its systems here include a home battery. Its median price for an owned system, $3.15/W, is 21% below the Fullerton median of $4.00/W. A typical system is 9.7 kW, about 24 panels, and it has installed in Fullerton since 2022.
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Serves Fullerton, CA · no office address listed
- Mostly sells systems you own
- Typical system
- 10.0 kW
- Median price (owned)
- $3.01/W
- Leased / PPA
- 0%
- With battery
- 45%
Solar Optimum Design Electrical mostly sells systems the homeowner owns, paid in cash or with a loan. Its most common setup here pairs Panasonic panels with Enphase microinverters. 45% of its systems here include a home battery. Its median price for an owned system, $3.01/W, is 25% below the Fullerton median of $4.00/W. A typical system is 10.0 kW, about 25 panels, and it has installed in Fullerton since 2011. It is also among the top installers in 19 other cities we rank, including Torrance and Costa Mesa.
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- Mostly sells systems you own
- (866) 467-6987
- powur.com
- 5850 El Camino Real, Carlsbad, CA 92008
- Typical system
- 9.0 kW
- Median price (owned)
- $4.42/W
- Leased / PPA
- 3%
- With battery
- 20%
Powur mostly sells systems the homeowner owns, paid in cash or with a loan. Its most common setup here pairs Hanwha Q CELLS panels with Enphase microinverters. 20% of its systems here include a home battery. Its median price for an owned system, $4.42/W, is 10% above the Fullerton median of $4.00/W. A typical system is 9.0 kW, about 23 panels, and it has installed in Fullerton since 2019. It is also among the top installers in 24 other cities we rank, including Rancho Cucamonga and Costa Mesa.
Comparing quotes in Fullerton?
Divide each quote's total, before incentives, by the system size in watts. Homeowners in Fullerton who bought their system paid a median of $4.00/W in 2023–2025. Reject any 2026 quote that subtracts a 30% federal tax credit from a purchase: that credit ended in 2025.
How to check a solar quote →Solar Battery Installers in Fullerton
654 of the 1,532 home solar systems installed in Fullerton in 2023–2025 (43%) included a home battery, put in by 113 companies. These installed the most:
| Installer | With battery | Of its installs | Median price | Leased / PPA |
|---|---|---|---|---|
| 1. Sunrun | 181 | 71% | — | 95% |
| 2. Tesla | 86 | 80% | $4.33/W | 0% |
| 3. Orange County Contracting Services | 40 | 64% | $4.55/W | 15% |
| 4. Bright Planet Solar | 37 | 51% | — | 95% |
| 5. Solar Optimum Design Electrical | 14 | 45% | — | 0% |
- Most common battery: Tesla (39% of those with a known brand), then Enphase Energy (22%).
- What a battery adds: owned systems with one had a median of $4.53/W, against $4.00/W for all home systems in Fullerton. The recorded price includes the battery, so the gap (+0.53 $/W on a 7.8 kW system) is roughly what it cost.
- Battery on most of their jobs: Sunrun (71%), Tesla (80%), Orange County Contracting Services (64%), Bright Planet Solar (51%), LGCY Electric (87%). The others add one on some jobs, not by default.
Ask whether a battery quote backs up the whole house or only a subpanel, and size it from your bills: one 13 kWh battery covers essentials overnight, not central air. Under California's Net Billing Tariff (from April 2023) exported solar earns little, so storing it for evening use is what makes a battery pay. More in Tesla Powerwall installation.
Home Solar in Fullerton by the Numbers
Based on 1,533 residential systems installed in Fullerton between 2023 and 2025, as reported to utilities and state agencies.
Most-installed panel brands
- Hanwha Q CELLS
- REC Group
- JA Solar
Most-installed inverter brands
- Enphase Energy
- SolarEdge
- Tesla
How these brands compare nationwide: share, price and leasing →
Home installations per year
Median price of owned systems by year: 2020: $3.69/W · 2021: $3.58/W · 2022: $3.98/W · 2023: $3.81/W · 2024: $4.43/W · 2025: $4.27/W.
Solar Panel Repair in Fullerton
When a system stops producing, the best first call is an established local company. The companies ranked above installed systems in Fullerton through 2025, so they know the equipment on local roofs. Many will service a system they didn't install, but not all — ask before you book, and expect a diagnostic fee.
47% of the home systems installed here in 2023–2025 use Enphase Energy inverters, followed by SolarEdge (26%). Enphase systems use a microinverter under each panel, so one failure usually knocks out a single panel and the monitoring app shows which one. Systems with a central (string) inverter — SolarEdge and others — stop producing entirely when that inverter fails; a dark screen or an error code on the unit on your wall is the usual sign.
Checks to do before you call anyone: solar troubleshooting guide. Storm damage, a roof leak or a burning smell: what to do first.
Installers That Closed or Went Bankrupt in Fullerton
At least 641 home solar systems in Fullerton were installed by companies that have since closed, liquidated or filed for bankruptcy. They are left out of the ranking above. If one of them installed your system, its workmanship warranty is likely gone — but panel and inverter warranties come from the manufacturer and usually survive the installer.
- SunPower145 systems in Fullerton
Filed for Chapter 11 bankruptcy in August 2024. Its assets were sold off. The SunPower brand now belongs to Complete Solaria, a different company that renamed itself SunPower in 2025. Source: Utility Dive
- Freedom Forever143 systems in Fullerton
Filed for Chapter 11 in April 2026; converted to Chapter 7 liquidation in August 2026. Source: pv magazine USA
- Verengo115 systems in Fullerton
Filed for Chapter 11 bankruptcy in September 2016; its last office closed in 2019. Source: pv magazine
- Sungevity105 systems in Fullerton
Sungevity filed for Chapter 11 bankruptcy in March 2017. Source: Solar Power World
- PetersenDean65 systems in Fullerton
Filed for Chapter 11 bankruptcy in June 2020; its assets were sold in 2021. Source: Solar Power World
- American Solar Direct41 systems in Fullerton
Filed for Chapter 7 bankruptcy in June 2017. Source: pv magazine USA
- Solcius27 systems in Fullerton
Filed for Chapter 7 bankruptcy in February 2024. Source: Solar Power World
- Clean Initiative63 systems in Fullerton
No installations recorded anywhere in California after 2024 (records run through 2025). That does not by itself mean the company closed — check before relying on it for service.
- Applied Solar Energy32 systems in Fullerton
No installations recorded anywhere in California after 2019 (records run through 2025). That does not by itself mean the company closed — check before relying on it for service.
- Zero Energy Contracting32 systems in Fullerton
No installations recorded anywhere in California after 2019 (records run through 2025). That does not by itself mean the company closed — check before relying on it for service.
- REC Solar Commercial28 systems in Fullerton
No installations recorded anywhere in California after 2020 (records run through 2025). That does not by itself mean the company closed — check before relying on it for service.
- California Solar Systems20 systems in Fullerton
No installations recorded anywhere in California after 2024 (records run through 2025). That does not by itself mean the company closed — check before relying on it for service.
See the full list of solar companies that went out of business and what still works if yours is one of them.
Solar in Fullerton: Common Questions
Who installs the most solar panels in Fullerton?
In the most recent three years of records (2023–2025), Sunrun installed 255 home systems in Fullerton, more than any other company. Tesla (108) and Bright Planet Solar (73) came next. Volume shows local experience, not workmanship, so compare quotes and reviews before choosing.
How much does a solar system cost in Fullerton?
Homeowners who bought their system outright paid a median of $4.00/W before incentives, and the typical system was 7.8 kW — about $31,000 in total. Prices vary by installer: in the ranking above, the median ranges from $2.93/W to $5.00/W.
Do most people in Fullerton buy or lease their panels?
71% bought their system and 29% leased it or signed a power purchase agreement (PPA). With a lease or PPA you pay little upfront, but you don't own the panels and the savings are smaller over the contract. Some installers sell almost only one way — check the "Leased / PPA" figure for each company in the ranking.
Who repairs solar panels in Fullerton?
Start with the companies in the ranking above: Sunrun, Tesla and Bright Planet Solar did the most work here, and an installer that knows the equipment on local roofs can usually diagnose a fault faster. If your system was leased or is on a PPA, call the company you pay each month first — maintenance is normally its job.
Can I still get the federal solar tax credit in 2026?
Not as a homeowner buying the system: the 30% residential credit (Section 25D) ended on December 31, 2025. Be wary of any quote that still subtracts it from the price. See our 2026 solar tax credit guide for what's left.
What if my solar installer went out of business?
Your panels and inverters are still covered by their manufacturers' warranties; what you lose is the installer's workmanship and roof-leak warranty. If the system is leased or on a PPA, the company you pay each month is usually responsible for repairs, and any active company in the ranking can take over service. See the installers that closed in Fullerton and what still works when an installer closes.
What do homeowners in Fullerton pay for electricity?
Residential customers in California pay an average of 34.74¢ per kWh, 99% above the national average. The higher the rate, the faster solar pays for itself. Source: EIA, Electric Power Monthly, Table 5.6.A.
No company pays to be listed or to rank higher, and any ad on this site is labeled. Before you sign, confirm the contractor license, insurance and recent reviews, and get at least three quotes. If a company in Fullerton has closed, moved or changed its phone number, tell us and we'll check it.
How This Ranking Works
Companies are ranked by the home solar systems they installed here in 2023–2025, from utility and state records; each needs at least 10 local installations and must still have been installing in 2025. Closed or bankrupt companies are removed and listed separately. The count shows local experience, not workmanship or service.
Source: Tracking the Sun, Lawrence Berkeley National Laboratory (2026 edition), licensed CC BY 4.0. In New York and New Jersey, recent years come from the state programs' own records (NYSERDA and New Jersey's Clean Energy Program). Company names were standardized and closures checked against news reports by Solar Power Fix. More about our methodology.
Solar system not producing in Fullerton?
The checks to do before you call anyone: the inverter screen, the breakers, the monitoring app and what each error code means.