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8 kW Solar System

Cost, production, and savings — calculated for your location

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20

400W Panels

11.7k

kWh/Year (avg)

20.4k–24.8k

Installed Cost

If you've gotten a solar quote for a 8 kW system, use this calculator to sanity-check the numbers. A 8 kW array should produce roughly 11,700 kWh/year in a state with average sun hours — enough to save $1,400–$3,300 per year depending on your utility rate. Plug in your state and actual electricity rate to see your personalized estimate.
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8 kW Solar System — FAQ

What happens to my solar system during a power outage?▾
Standard grid-tied solar systems automatically shut down during grid outages (a safety requirement to protect utility workers). To keep power flowing during an outage, you need battery backup or a generator. Hybrid systems with battery storage can maintain critical loads for hours or days during outages.
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 many solar panels does the average home need?▾
Most US homes need between 15 and 30 panels (6–12 kW system). The exact number depends on your electricity usage, your state's sun hours, roof orientation, and the wattage of the panels you choose. Enter your bill or usage above to get a personalized estimate.
How does shading affect solar panel performance?▾
Even partial shading can significantly reduce output. Traditional string inverters cause the whole string to underperform if one panel is shaded. Microinverters and DC optimizers mitigate this by allowing each panel to operate independently. If your roof has trees or chimneys that cause partial shading, request microinverters in your quotes.
What are my options for financing solar panels?▾
The main options are: (1) Cash purchase — best ROI, you get the full ITC. (2) Solar loan — low-rate loans from installers, Sungage, GreenSky, or your credit union allow ownership with no upfront cost. You still get the ITC. (3) HELOC — if you have home equity. (4) Solar lease/PPA — no ownership, no ITC, lower savings but zero upfront. (5) PACE financing — property-assessed loans available in some states.

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Disclaimer: System cost, production, and savings estimates are based on national averages. Select your state in the calculator above for location-specific estimates. Not financial advice.