San Marcos, CA 92078 solar market data
Updated April 17, 2026 By The SolarDNA Data Team
San Marcos 92078 has 6,520 solar installations at a median installed cost of $4.13/W, installations up 55.7% over the trailing twelve months, and a Market Score of 61 — higher than 99% of U.S. zip markets.
Zip Market Score
Excellent · higher than 99% of zips
Versus California
How 92078 compares with the state
Installed cost
$0.14/W below
state median $4.26/W
Market score
61 vs 53
California scores 53
Share of state installs
0.29%
of 2.3M tracked statewide
Battery attach
7.4%
state 12.7%
Statewide momentum
▲ 1.1%
residential solar added in California, 12 months through Jul 2026
Statewide market
2.3M systems
30.9% of homes · utility-reported through Jul 2026
Next-12-month outlook: 320–432 installs (midpoint 376)
Trailing-12-month installs carried forward at half the observed growth rate (capped at ±30%), with a ±15% band. Not a forecast of permits or policy.
Growth & pricing
92078 by year
327 installs in the trailing twelve months vs 210 before
Installations by year
Median installed cost, $/W DC by year
Installer comp set
Who installs in 92078
Ranked by systems recorded in this zip
| # | Installer | Installs | 12-mo | Avg kW | $/W |
|---|---|---|---|---|---|
| 1 | SUNRUN | 906 | 99 | 5.17 | $4.44 |
| 2 | BAKER ELECTRIC SOLAR | 726 | 0 | 8.92 | $4.07 |
| 3 | TESLA | 645 | 8 | 11.09 | $4.97 |
| 4 | SUNPOWER | 452 | 0 | 3.52 | $4.22 |
| 5 | SUNSTREET ENERGY GROUP | 322 | 0 | 4.28 | $3.80 |
| 6 | SEMPER SOLARIS | 251 | 0 | 5.8 | $3.97 |
| 7 | STELLAR SOLAR | 184 | 6 | 8.19 | $3.95 |
| 8 | SUNLINE ENERGY | 117 | 6 | 6.54 | $3.58 |
| 9 | GAF ENERGY | 110 | 95 | 3.81 | $7.20 |
| 10 | BRIGHT PLANET SOLAR | 99 | 7 | 4.91 | $4.53 |
| 11 | SOLARTECH ENERGY SYSTEMS | 94 | 0 | 6.81 | $3.71 |
| 12 | SUNGEVITY | 93 | 0 | 5.81 | $4.04 |
Neighboring zips
The nearest zip markets
By distance between zip centroids
| Zip | Distance | Installs | $/W | Score |
|---|---|---|---|---|
| 92069 San Marcos | 3.1 km | 5,441 | $4.23 | 51 |
| 92081 Vista | 7.2 km | 3,078 | $4.20 | 46 |
| 92029 Escondido | 7.5 km | 4,360 | $4.17 | 46 |
| 92009 Carlsbad | 7.6 km | 6,390 | $4.02 | 60 |
| 92026 Escondido | 9.3 km | 7,122 | $4.10 | 53 |
| 92011 Carlsbad | 10.3 km | 2,545 | $3.90 | 47 |
Same city
Other zips in San Marcos
Equipment
What gets installed in 92078
Share of systems with a recorded brand
Modules
QCELLS NORTH AMERICA18.8%
SUNPOWER17.9%
LG ELECTRONICS14.8%
LONGI GREEN ENERGY TECHNOLOGY4.7%
REC GROUP2.9%
Inverters
ENPHASE ENERGY30.9%
SOLAREDGE30.4%
SUNPOWER11.3%
SMA AMERICA6.7%
TESLA3.6%
Frequently asked
Quick answers about 92078
How many solar installations are there in 92078?
SolarDNA counts 6,520 active solar installations in San Marcos 92078, 6,444 of them residential, with data through April 17, 2026.
How much does solar cost in 92078?
The median residential system in 92078 cost $4.13 per watt over the trailing twelve months, $0.14/W below the California median.
Is solar growing in 92078?
Installations in 92078 are up 55.7%: 327 in the trailing twelve months versus 210 before.
Who installs solar in 92078?
SUNRUN, BAKER ELECTRIC SOLAR, TESLA lead the 421 installers with systems in 92078. The full comp set is above.
Is 92078 a good market for solar sales?
92078 scores 61 out of 100 (Excellent, higher than 99% of U.S. zip markets).