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California Solar Panel Calculator

Local rates, sun hours & savings — specific to California

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5.82

Peak Sun Hrs/Day

$0.277

Avg Rate ($/kWh)

$179

Avg Monthly Bill

6 yrs

Est. Payback

California leads the nation in installed solar capacity, and its 5.82 peak sun hours per day combine with some of the highest electricity rates in the country ($0.28/kWh average) to make solar a financial no-brainer for most homeowners. The shift to NEM 3.0 net metering has changed how export credits work, making it important to model your specific situation — this calculator uses California's actual rate and sun data to show you what solar would save at your home.

5.82 hrs

Sun Hours/Day

$0.277

Rate ($/kWh)

$2.85

Avg Cost/Watt

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Solar Data for California

Peak Sun Hours
5.82 hrs/day (NREL annual avg)
Avg Electricity Rate
$0.2768/kWh (EIA 2024)
Avg Monthly Bill
$179/month
Avg Install Cost
$2.85/W (LBNL Tracking the Sun)
Est. Payback (avg bill)
6 years (before 30% ITC)
Federal ITC
30% through 2032

Solar Panels in California — Frequently Asked Questions

Does my roof need to be replaced before installing solar?▾
Solar installers recommend that your roof have at least 10–15 years of remaining life before installation. If your roof is more than 15 years old, consider replacing it first — removing and reinstalling solar panels costs $1,500–$3,000. A new roof paired with solar can sometimes be financed together. Most installers will assess your roof during the quoting process.
Does roof orientation affect how much power solar panels produce?▾
Yes, significantly. South-facing roofs receive the most direct sunlight and are ideal (factor: 1.00). East and west-facing roofs produce about 15% less. North-facing roofs produce roughly 30% less. Flat roofs can be angled for optimal output.
How much maintenance do solar panels require?▾
Very little. Solar panels have no moving parts and typically only need occasional cleaning (rain usually handles this) and an annual production check. Most panels come with 25-year performance warranties. Inverters have a 10–12 year lifespan and cost $1,000–$2,500 to replace. Overall, solar systems are low-maintenance assets.
Can solar panels completely eliminate my electricity bill?▾
A properly sized solar system can offset 90–100% of your annual electricity use, but you'll likely still have a small monthly connection fee ($10–$20) to stay connected to the grid. If you add battery storage, you can further reduce grid dependency. Net metering allows excess daytime production to offset nighttime usage in many states.
How much does a solar system cost installed?▾
Installed solar costs range from $2.50 to $3.50 per watt depending on your state, system size, panel brand, and installer. A 10 kW system runs $25,000–$35,000 before incentives. After the 30% federal ITC, that's $17,500–$24,500. Many states offer additional rebates that can reduce costs further. Get 3 quotes to find competitive local pricing.

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12 kW Solar System

Full cost and savings breakdown for a 12 kW installation

Disclaimer: Data sources: NREL PVWatts (sun hours), EIA 2024 Residential Rate Survey (electricity rates), Lawrence Berkeley National Lab Tracking the Sun (install costs). Estimates are for planning only. Actual savings depend on your specific roof, shading, utility policies, and available incentives. Not financial or tax advice.