Solar Energy in San Diego, California
Above Average Solar Resource
#3 nationally · #2 in California
Pop. 1,386,932
San Diego, California receives 5.26 kWh/m²/day of solar irradiance and 6.0 peak sun hours daily, representing above-average solar resources . A typical 5 kW residential solar system in San Diego produces approximately 8,804 kWh annually, potentially saving homeowners $2,263 per year on electricity bills. After the 30% federal Investment Tax Credit, a 5 kW system has an estimated payback period of 4.6 years, leaving roughly 20 years of profitable operation within a standard 25-year warranty. For maximum annual output in San Diego, panels should be tilted at approximately 33° and oriented true south (180° azimuth).
Solar Resource Summary
GHI vs. US national average (4.5 kWh/m²/day)
Above Average
0
7.5 kWh/m²/day
Monthly Solar Data
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| GHI (kWh/m²/d) | 3.32 | 3.96 | 5.3 | 6.41 | 6.47 | 6.88 | 7.07 | 6.77 | 5.71 | 4.48 | 3.58 | 3.1 | 5.26 |
| DNI (kWh/m²/d) | 5.24 | 4.98 | 5.87 | 6.24 | 5.45 | 5.86 | 6.43 | 6.72 | 6.18 | 5.48 | 5.37 | 5.2 | 5.76 |
Source: NREL. Monthly averages in kWh/m²/day and °C.
Solar Production Estimates for San Diego
5 kW Residential
Typical home system
8,804 kWh/yr
734 kWh/month avg
≈ $2,263/year savings
10 kW Residential
Large home system
17,608 kWh/yr
1,467 kWh/month avg
≈ $4,526/year savings
50 kW Commercial
Small commercial
88,038 kWh/yr
7,336 kWh/month avg
100 kW Commercial
Medium commercial
176,076 kWh/yr
14,673 kWh/month avg
Production estimates based on NREL solar resource data, 33° tilt, south-facing orientation, and 80% performance ratio.
Local Solar Conditions in San Diego
Solar production in San Diego is relatively consistent year-round, ranging from 3.1 to 7.1 kWh/m²/day across the seasons.
- Best Tilt Angle
- 33° (latitude-optimized)
- Best Azimuth
- 180° (true south)
- Coordinates
- 32.7157°N, -117.1611°
Financial Overview — Solar in San Diego
Solar is an excellent investment in San Diego. With a 4.6-year payback on a 5 kW system and 25-year panel warranties, early adopters in San Diego can expect 15+ years of net profit. Estimated annual savings from a 5 kW system: $2,263/year.
- Avg. Electricity Rate
- $0.257/kWh (CA avg)
- Est. Annual Savings (5 kW)
- $2,263/year
- Est. Payback Period
- 4.6 years (after 30% ITC)
- Federal ITC
- 30% of system cost
- Net Metering
- Available
Financial estimates assume a 5 kW system at $3,000/W installed ($15,000 pre-ITC, $10,500 after 30% credit).
Actual costs vary by installer and equipment. Consult a local solar installer for firm quotes.
Solar FAQ — San Diego, California
In San Diego, California, a 5 kW residential solar system produces approximately 8,804 kWh of electricity per year. A 10 kW system produces about 17,608 kWh annually. These estimates use 5.3 kWh/m²/day average solar irradiance and an 80% system performance ratio, accounting for real-world losses from wiring, inverter efficiency, and temperature. Actual output will vary based on your specific roof orientation, shading, and equipment.
San Diego receives an average Global Horizontal Irradiance (GHI) of 5.26 kWh/m²/day. This is 0.76 kWh/m²/day above the US national average of 4.5 kWh/m²/day, placing San Diego above the national average. GHI measures total solar energy incident on a horizontal surface and is the primary indicator of a location's solar resource quality.
San Diego, California receives an average of 6.0 peak sun hours per day. Peak sun hours represent the equivalent number of hours when solar irradiance equals 1,000 W/m² — the standard condition used to rate solar panel output. This means a 1 kW solar panel array in San Diego produces 6.0 kWh on a typical day. Seasonal variation is significant: summer months see peak sun hours 40–60% higher than winter months in most US locations.
San Diego is a above average location for solar panels, with 5.26 kWh/m²/day solar irradiance — above the national average. It ranks #2 in California and #3 nationally for solar potential. With an estimated payback period of 4.6 years, solar installations in San Diego can be financially attractive, especially given California's electricity rates.
The optimal tilt angle for solar panels in San Diego is approximately 33°, which corresponds to the city's latitude. This angle maximizes annual energy production by ensuring panels receive the most direct sunlight averaged over the year. For maximum winter output, tilt panels at latitude + 15° (48°). For maximum summer output, use latitude − 15° (18°). Fixed south-facing panels at the latitude angle are the standard recommendation for residential systems in San Diego.
A 5 kW solar system in San Diego can save an estimated $2,263 per year on electricity bills, based on San Diego's average electricity rate of $0.257/kWh. Over a 25-year system lifetime, that represents $56,575 in total savings before accounting for electricity rate increases. After the 30% federal Investment Tax Credit, the net system cost of approximately $10,500 for a 5 kW system yields a payback period of 4.6 years.
San Diego ranks #2 in California for solar potential based on annual GHI. This means 1 city has higher solar irradiance in the state. As a top-ranked solar location, San Diego offers particularly strong economics for solar installations.Browse other California cities on our California solar data page to compare locations.
For a typical home in San Diego using 1,000 kWh/month, a 5 kW solar system producing 734 kWh/month would offset approximately 73% of a typical household's electricity use. Most residential installations in similar climates range from 5 to 12 kW depending on energy consumption, roof size, and budget. Use SolarScope's Site Studio to get a personalized system size recommendation based on your specific address and energy bills.
Based on local solar irradiance and electricity rates, a 5 kW residential solar system in San Diego has an estimated payback period of 4.6 years. This calculation assumes a net system cost of $10,500 (after the 30% federal ITC) and annual savings of $2,263. Modern solar panels carry 25-year performance warranties, so systems in San Diego would operate profitably for roughly 20 years after payback. Electricity rate increases over time typically reduce the effective payback period.
Other Cities in California
Learn more:
Solar irradiance ·
Peak sun hours ·
GHI explained ·
Net metering ·
How solar analysis works
Get a Detailed Solar Analysis for San Diego
This page shows area-level averages. For your specific address — accounting for roof orientation, shading trees, and your utility rate — use SolarScope's AI-powered Site Studio.
Open Site Studio Community Data for CaliforniaQuick Stats
- Annual GHI
- 5.26 kWh/m²/day
- Peak Sun Hours
- 6.0 h/day
- 5kW Production
- 8,804 kWh/yr
- Payback (5kW)
- 4.6 years
- Rank in California
- #2