Solar panel installation costs vary by system size, equipment quality, and local incentives. A typical 6 kW residential system ranges from $12,000 to $20,000 before federal tax credits. Prices have stabilized in recent years as technology improves and competition increases.
| Item | Typical range |
|---|---|
| Average 6 kW System Cost | $12,000 - $20,000 |
| Cost per Watt | $2.50 - $3.50 |
| Payback Period | 7 - 12 years |
| Federal Tax Credit | 30% of system cost |
System Size and Wattage
Larger systems generate more electricity but cost more upfront. A 10 kW system typically runs $18,000 to $30,000, while a 4 kW system costs $8,000 to $14,000.
Equipment Type and Efficiency
High-efficiency panels (like monocrystalline) cost $3.00 to $4.00 per watt, whereas standard polycrystalline panels run $2.50 to $3.00 per watt. Microinverters add about $0.30 per watt compared to string inverters.
Incentives and Rebates
The US federal solar tax credit offers 30% of system cost, and many states add rebates up to $1,000. In Canada, provincial programs vary; Ontario’s net metering can reduce payback time by 2–3 years.
What moves the price in California
System size, panel type, and roof complexity are the main drivers. Local quotes reflect the items below, so two providers can quote different totals for the same described job without either being wrong.
- Local labour rates and licensing requirements for the trade or professional involved
- Permits, inspections and disposal fees set by the local authority
- Travel and call-out charges for the distance from the nearest provider
- Season and demand peaks, which move both the price and the wait
- Materials, parts or inputs, and how their grade or availability changes the total
- Whether the work is a repair, a partial job or a full replacement
How to compare solar panels quotes in California
Write the scope down first, then send the same description to at least three local providers. Compare the quotes line by line against that scope rather than by the headline total.
- Agree the scope: exactly what is being repaired, replaced or supplied, and how far the work extends.
- List the inclusions: labour, materials, permits, inspection fees, disposal and clean-up, each stated separately.
- Ask what is excluded, and what would trigger an extra charge once the work starts.
- Check timing: how soon work can start, how long it takes, and whether out-of-hours rates apply.
- Confirm terms: deposit, payment schedule, warranty on parts and labour, and how changes are priced.
A lower total that leaves out permits, disposal or a necessary second stage is not cheaper once those items are added back. Ask each provider in writing what would change the price.
This page does not quote work and is not a contractor. The range above is an estimate, not an offer.
Common questions
What moves the price of solar panels in California?
Is the range on this page a quote?
How should I compare solar panels quotes in California?
Can solar panels costs be financed?
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