Why the Central Valley is ideal for solar
With 260+ sunny days, minimal cloud cover, and some of California’s highest electricity rates, the Central Valley is one of the best regions in the country for solar ROI. Average solar irradiance here is 5.5-6.0 kWh/m²/day — excellent for power generation.
Solar roofing options
Traditional solar panels (most common)
- Cost: $2.50-$3.50 per watt installed (before incentives)
- Typical system: 6-10 kW for a Central Valley home = $15,000-$35,000 before tax credits
- After 30% federal tax credit: $10,500-$24,500
- Lifespan: 25-30 years with 80%+ output
- ROI: 6-10 year payback in the Central Valley
Solar shingles (Tesla Solar Roof, GAF Energy)
- Cost: $20-$30 per square foot (roof + solar combined)
- Pros: Sleek appearance, integrated with roofing
- Cons: 2-3x the cost of panels + traditional roof, longer payback period
- Best for: New construction or full roof replacements where aesthetics are the top priority
Roof requirements for solar
Before installing solar, your roof must meet these criteria:
- Age: Your roof should have 15+ years of remaining life. Installing solar on a roof that needs replacement in 5 years means paying to remove and reinstall panels.
- Condition: No leaks, damaged shingles, or structural issues
- Orientation: South-facing is ideal, west-facing is good. North-facing is not recommended.
- Shade: Minimal shading from trees or neighboring buildings
- Structure: Roof must support the additional 3-5 lbs/sq ft weight
Replace your roof first
This is the most important advice in this article. If your roof is more than 10-15 years old, replace it before installing solar. Here is why:
- Cost of removal: Removing and reinstalling solar panels costs $2,000-$5,000
- Warranty issues: Solar installation can void roofing warranties if not coordinated
- Efficiency: Doing both at once saves on labor, scaffolding, and permits
- Mounting: New roofs provide a clean, solid surface for panel mounting
Read our detailed guide: Should You Replace Your Roof Before Installing Solar Panels?
Financial incentives
- Federal Solar Tax Credit (ITC): 30% of total system cost through 2032
- California Net Metering (NEM 3.0): Sell excess power back to the grid (reduced rates under NEM 3.0)
- Property tax exemption: Solar installations exempt from property tax increases in California
- Increased home value: Solar adds an average of $15,000-$20,000 to home value
DeHart Roofing solar services
We coordinate roof replacement and solar installation together, saving you money and ensuring both systems work in harmony. Our solar roofing service includes assessment, coordination with solar installers, and a unified warranty. Get started with a free roof and solar assessment.
Frequently asked questions
A typical 8 kW residential system costs $20,000-$28,000 before the 30% federal tax credit, bringing the net cost to $14,000-$19,600. Payback period is 6-10 years depending on your electricity usage.
Yes, if your roof is more than 10-15 years old. Removing and reinstalling solar panels later costs $2,000-$5,000. It is much more cost-effective to do both at once.
Not when properly installed by qualified professionals. Panels are mounted on rails attached to the roof structure, with flashing around each penetration point. Quality installation actually protects the roof area under the panels from UV and weather.
Modern solar panels are warrantied for 25-30 years and typically produce 80%+ of rated output at that age. Many panels continue producing well beyond 30 years at reduced efficiency.