Home solar cost and contracts

How Much Roof Does a 10kW Solar System Cover, and How Much Will It Produce?

Published September 23, 2026 · By the SolarPanelX editors · Prices and specs as of that date, from the pages under Sources

Summary

With 400 W panels it takes 25 of them, about 49 m² (528 sq ft) of panel and about 550 kg (1,213 lb). Using 440 W panels gets to 10.12 kW with 23 panels and about 45 m². Annual output depends on where the roof is: modeled for a south-facing, 20-degree array, 10 kW made about 17,550 kWh in Phoenix, 12,910 kWh in New York, and 10,880 kWh in Seattle.

Twenty-five panels or twenty-three

Both panels below come from Qcells datasheets dated April 2026. The 400 W Q.PEAK DUO BLK ML-G10+ measures 1,879 × 1,045 mm and weighs 22.0 kg; the 440 W Q.TRON BLK M-G2+ measures 1,722 × 1,134 mm and weighs 21.2 kg. Each covers roughly 1.96 m² and 1.95 m² respectively, so the gap in panel count carries straight through to roof area.

Panel	Count	Total	Panel area	Panel weight
Q.PEAK DUO BLK ML-G10+ 400 W	25	10.0 kW	about 49.1 m²	550 kg
Q.TRON BLK M-G2+ 440 W	23	10.12 kW	about 44.9 m²	about 488 kg

Those areas are panel surface only, with no allowance for gaps between panels or setbacks from roof edges.

Bigger than the typical U.S. home system

Lawrence Berkeley National Laboratory's 2026 data update puts the median U.S. residential system installed in 2025 at 7.7 kW, with most falling between roughly 5 and 12 kW (the 20th to 80th percentile). At 10 kW, a system sits inside that range and about 30% above the median.

Same 10 kW, 1.6 times the energy

These figures come from NLR's PVWatts, run at 1 kW and multiplied by ten. Every input stayed the same (south-facing, 20° tilt, fixed roof mount, 14% losses) except the city.

City	Per kW per year	10 kW per year
Phoenix	about 1,755 kWh	about 17,550 kWh
New York	about 1,291 kWh	about 12,910 kWh
Seattle	about 1,088 kWh	about 10,880 kWh

A 10 kW array in Phoenix produces about what 16 kW of panels would in Seattle.

Sources

We have not tested these products. Specs, prices, stock and terms are as published on these pages on the date above and can change; check the manufacturer or retailer before you buy.

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