What You Need to Know Before You Start
Installing solar panels on your home is a major investment that can reduce electricity bills and increase property value. The first step is to evaluate your roof's suitability, energy needs, and local regulations. A thorough assessment ensures the system will perform efficiently and comply with city ordinances.
- What You Need to Know Before You Start
- Assessing Roof Suitability
- Roof Orientation and Tilt
- Roof Condition and Age
- Calculating Your Energy Requirements
- Choosing the Right Equipment
- Solar Panels
- Inverters
- Mounting Systems
- Understanding the Permitting Process
- Cost Breakdown and Financing Options
- Installation Steps
- Site Survey and Design
- Permit Submission
- Panel Mounting
- Electrical Wiring
- Inspection and Interconnection
- Maintenance and Monitoring
- Common Pitfalls to Avoid
- Next Steps
More from this site
Keep reading the latest coverage
Assessing Roof Suitability
Roof Orientation and Tilt
South‑facing roofs with a tilt between 15° and 30° capture the most sun in most U.S. locations. East or west orientations still work but yield slightly less power.
Roof Condition and Age
Panels last 25–30 years. If your roof is due for replacement, install solar first to avoid double work. Ensure structural integrity can support the panel weight.
Calculating Your Energy Requirements
Start by reviewing your past utility bills. Divide the total kWh per month by the average daily sunlight hours in your area to estimate the system size you need. A typical U.S. home uses 900–1,200 kWh/month, which translates to a 5–6 kW system.
Choosing the Right Equipment
Solar Panels
Three main types: monocrystalline, polycrystalline, and thin‑film. Monocrystalline panels offer the highest efficiency (18–22%) but cost more.
Inverters
String inverters, microinverters, and power optimizers each have pros and cons. Microinverters provide better performance in shaded roofs, while string inverters are cheaper.
Mounting Systems
Fixed‑tilt mounts are simplest; adjustable mounts allow seasonal angle changes for extra output.
Understanding the Permitting Process
Most municipalities require a building permit, electrical permit, and sometimes a solar‑specific permit. Contact your local building department for exact forms and fees. In many states, solar installation is exempt from certain fees, but you must still file a "solar installation" notice.
Cost Breakdown and Financing Options
| Item | Estimated Cost | Notes |
|---|---|---|
| Panels (5 kW) | $6,000–$8,000 | Includes purchase and delivery |
| Inverter | $800–$1,200 | Depends on type and brand |
| Mounting hardware | $500–$1,000 | Varies with roof type |
| Installation labor | $4,000–$6,000 | Includes permits and wiring |
| Total | $11,300–$15,200 | Pre‑tax, before incentives |
Federal tax credits can reduce the net cost by 26% (as of 2024). Many states offer rebates or performance‑based incentives that further lower the price. Consider financing through a solar loan or Power Purchase Agreement (PPA) to spread costs.
Installation Steps
Site Survey and Design
A professional installer will conduct a structural analysis, shade study, and electrical load calculation to design a system that meets your needs.
Permit Submission
Submit plans to the local building department. Review any comments and adjust the design if necessary.
Panel Mounting
Secure mounts to the roof, ensuring proper drainage and ventilation to prevent moisture buildup.
Electrical Wiring
Run conduit from the mounting area to the electrical panel. Install the inverter and connect it to the main panel. A licensed electrician must perform this step.
Inspection and Interconnection
After installation, the utility company inspects the system. Once approved, you can interconnect your panels to the grid and start generating power.
Maintenance and Monitoring
Solar panels require minimal upkeep: clean the panels every 6–12 months and check for debris or shading. Most installers offer monitoring dashboards that let you track output in real time.
Common Pitfalls to Avoid
- Ignoring local shading from trees or neighboring buildings.
- Choosing a low‑quality inverter that reduces overall efficiency.
- Skipping the structural load analysis on older roofs.
Next Steps
Contact a reputable installer for a free quote, review their certifications (e.g., NEMA, NABCEP), and ask for references. Once you have a detailed proposal, compare it against the cost breakdown above to ensure you're getting a fair deal.