Going solar is one of the most impactful financial and environmental decisions a homeowner can make. But the solar market is complex, full of sales pressure, and easy to get wrong. Here's everything you need to know before signing anything.
How Much Do Solar Panels Cost?
The average U.S. residential solar installation costs $15,000–$25,000 before incentives, depending on system size, location, and installer. A typical 6kW system runs about $18,000 before the federal tax credit.
After the 30% federal Residential Clean Energy Credit, a $18,000 system costs $12,600 out of pocket. Many states add additional rebates on top, and some utilities offer cash-back incentives.
The 30% Federal Tax Credit
The Inflation Reduction Act extended the solar investment tax credit (ITC) at 30% through 2032. This is a dollar-for-dollar reduction in your federal income tax bill — not a deduction. There's no income cap, but you do need to owe enough federal taxes to use it. If you don't use it all in one year, you can carry it forward.
The credit applies to panels, inverters, mounting hardware, and installation labor. It also applies to battery storage added at the same time.
How Much Can You Save?
The average 6kW system in the U.S. generates about 7,000–9,000 kWh per year, offsetting 60–100% of a typical home's electricity use. At the national average electricity rate of ~13¢/kWh, that's $900–1,200/year in savings — more in high-rate states like California ($0.25+/kWh) or Hawaii.
Use our Solar Panel Savings Calculator to estimate your specific savings based on location and system size.
Is Your Roof Ready?
Before getting quotes, check your roof's age, condition, and orientation:
- Age: If your roof is over 15 years old, consider replacing it before going solar. Removing and reinstalling panels for a roof replacement can cost $3,000–5,000 extra.
- Orientation: South-facing roofs at a 30° pitch are optimal. East/west-facing panels produce 10–20% less; north-facing is not recommended.
- Shading: Even partial shading from trees or chimneys significantly reduces output. Microinverters or power optimizers mitigate this.
- Structural integrity: Your roof must be able to support ~3–4 lbs per sq ft of additional load.
Choosing an Installer
This is where most homeowners make mistakes. The solar industry has a significant number of aggressive or unscrupulous installers. Here's how to choose well:
- Get at least 3 quotes — prices can vary by 20–30% for the same system
- Check for NABCEP certification (the gold standard for solar installers)
- Read Google and BBB reviews carefully
- Avoid high-pressure tactics or "today only" deals
- Ask whether they subcontract the installation (many large companies do)
Buying vs Leasing vs PPA
Buying outright (cash or loan) gives you full ownership, all the tax credits, and maximum long-term savings. Solar leases and PPAs (power purchase agreements) let you go solar with no upfront cost but the installer keeps the tax credits and profits from energy production. They're appealing but generally deliver less long-term value.
If you can't afford to buy, a solar loan is usually better than a lease. Look for low-interest green energy loans through your bank, credit union, or state clean energy programs.
What Payback Period Should You Expect?
The average solar payback period in the U.S. is 6–10 years after incentives. In high-sun, high-rate states (CA, AZ, HI, MA), it can be as low as 4–6 years. In low-sun states with lower rates (PNW, Midwest), 10–12 years is typical.
Given that quality solar panels come with 25-year performance warranties, even a 12-year payback leaves you with 13+ years of pure profit. Use our Solar ROI Calculator to model your specific scenario.
Understanding Your Solar Quote
When you receive a solar quote, you'll typically see the system size in kilowatts (kW), the estimated annual production in kilowatt-hours (kWh), the gross cost, and the net cost after the federal tax credit. Here's what to scrutinize:
- Price per watt: Divide the gross system cost by the system size in watts. A fair price is $2.50–$3.50/watt before incentives in most markets. Significantly higher suggests markup; significantly lower might indicate low-quality components.
- Production estimate: The quote should include a production estimate based on your roof's orientation, tilt, and shading. Ask what software they used (PVWatts, Aurora, or Helioscope are industry standards) and what assumptions they made.
- Panel brand and warranty: Tier 1 panels (Jinko, LONGi, Canadian Solar, REC, Panasonic) come with 25-year product and performance warranties. Ask specifically about the performance warranty — it should guarantee at least 80% of rated output after 25 years.
- Inverter type: String inverters are cheaper but suffer from whole-system performance drops if one panel is shaded. Microinverters or power optimizers cost more but optimize each panel independently — worth it for roofs with any shading.
Grid-Tied vs Off-Grid Solar
The vast majority of residential solar installations are grid-tied — your panels produce electricity during the day, excess goes to the grid, and you draw from the grid at night. You remain connected to your utility and benefit from net metering credits. This is the right choice for most homeowners: lower cost, no battery required, and no risk of running out of power.
Off-grid solar makes sense for remote properties without utility access, or for homeowners who want energy independence at any cost. It requires a significantly larger battery bank and a backup generator, adding substantially to system cost. For most suburban and urban homeowners, adding battery storage to a grid-tied system gives the resilience benefits of off-grid without the full cost.
Solar and Home Resale Value
Multiple studies, including Zillow research and Lawrence Berkeley National Laboratory data, have found that solar panels increase home resale value. The premium averages roughly $4 per watt of installed capacity — meaning a 6kW system could add about $24,000 to your home's value. This premium varies by market: it's stronger in states with high electricity rates and established solar markets (California, Massachusetts, New Jersey) and weaker in low-rate states with less solar adoption.
Importantly, this value premium generally applies only to owned systems, not leased systems or PPAs. Buyers can be hesitant to take on a solar lease, and it can complicate the sale process.
How Much CO2 Does Going Solar Actually Save?
Beyond the financial case, solar is one of the highest-impact carbon reduction actions a homeowner can take. A typical 6kW system offsets approximately 4.5–6 metric tons of CO2 per year — equivalent to planting about 230 trees annually, or taking one gas car off the road entirely.
The exact carbon offset depends on your grid region: homes in coal-heavy states like Indiana or Ohio offset 6–7 tons/year, while homes on the cleaner West Coast grid offset 2.5–4 tons/year. Over a 25-year system lifespan, even in a cleaner-grid state, a 6kW system accumulates 60–145 metric tons of net CO2 offset. Use our Solar CO2 Offset Calculator to see your specific numbers — and how many equivalent trees that represents.
Common Mistakes to Avoid
- Not getting multiple quotes: Solar prices vary 20–30% between installers for the same system. Always get at least three quotes.
- Choosing a lease or PPA without understanding the terms: Read the escalator clause — some agreements increase your payments by 2–3% per year.
- Oversizing the system: If your utility doesn't offer full retail net metering, excess production above your usage may be credited at a lower rate. Size your system to your actual usage.
- Not asking about permits and interconnection: A reputable installer handles all permits and utility interconnection. Ask upfront how long this process takes — it can add weeks to the timeline.
- Ignoring the roof condition: If your roof needs replacement within 10 years, do it before installing solar. Removing and reinstalling panels for a roof job costs $3,000–5,000.