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7 kW Solar System

Cost, production, and savings — calculated for your location

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18

400W Panels

10.2k

kWh/Year (avg)

17.8k–21.7k

Installed Cost

7 kW is right around the sweet spot for most US homes. For most US homes, a system this size can offset 70–90% of annual electricity consumption. This calculator estimates production, savings, and payback for a 7 kW solar installation — adjust the state, roof orientation, and shading conditions to see how local factors shift the numbers.
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7 kW Solar System — FAQ

What is net metering and how does it affect my savings?▾
Net metering is a utility billing arrangement where your excess solar production flows back to the grid and you receive a credit on your bill — usually at the retail electricity rate. Most US states require investor-owned utilities to offer net metering, though credit rates vary. Our calculator assumes full retail-rate net metering credits.
What does kilowatt (kW) mean for a solar system?▾
Kilowatts (kW) measure the peak power output of a solar system under ideal conditions (full sun, optimal temperature). A 10 kW system with 400W panels requires 25 panels. In practice, systems produce less than their peak rating due to sun angle, temperature, and efficiency losses — which is why we use a 0.80 derate factor in our calculations.
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.
Do solar panels work in cold climates and winter?▾
Yes — solar panels actually perform slightly better in cold temperatures (heat reduces semiconductor efficiency). The challenge in cold climates is fewer daylight hours and potential snow accumulation. A 10-degree tilt is usually sufficient for snow to slide off naturally. Northern states like Massachusetts and New York still have thriving solar markets despite cold winters.
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.

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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.