Solar Cost for a Modular Home in 2026

Solar Panel Cost by System Size: Modular Home Sizing Guide

System size, not home type, drives most of the cost. The table prices each size at $2.50–$3.40 per watt and estimates output using 4.5 peak sun hours a day and a 14% system loss. Those production figures are our own estimate, not a guarantee; real output varies by state, roof angle, and shading.

Solar System Cost by Size for Modular Homes (2026, before incentives)

For context, the typical U.S. household uses about 899 kWh a month, according to EIA’s 2022 Residential Energy Consumption Survey, so an 8 kW system is roughly a full offset in average sun. Homes in cloudier regions need more panels for the same output, and homes in the Southwest need fewer. Check your last 12 months of bills with our solar system size calculator.

Chart summary: Every extra 2 kW adds roughly $5,000–$6,800 at these per-watt prices. An 8 kW system, enough for an average-use home, falls between $20,000 and $27,200 before any incentives, so the per-watt price you negotiate matters more than almost any other choice.

How Long Until Solar Panels Pay for Themselves on a Modular Home?

With the federal credit gone, 2026 payback for purchased systems typically falls in the 8–12 year range, according to GreenLancer. EnergySage estimated that losing the credit would lengthen average payback by about 43%.

Simple payback is system cost divided by yearly bill savings. The chart below runs that math for an 8 kW system costing $22,000 ($2.75 per watt), producing about 942 kWh a month, at several state residential rates. It values every kWh at the retail rate and ignores incentives, rate increases, panel degradation, financing, and maintenance, so treat it as a comparison of rate levels, not a forecast.

Chart summary: Payback ranges from about 4.6 years at Hawaii’s 42.23¢/kWh to about 16.3 years at North Dakota’s 11.95¢/kWh, with the 18.56¢ U.S. average near 10.5 years. Rate level is the dominant factor. California and Hawaii look fastest here only if exports are credited generously; under California’s NEM 3.0 the real figure is longer, as the next sections explain.

Use our solar payback calculator to test your own rate and quote.

Is Solar Worth the Cost for a Modular Home in Your State?

For many homeowners it still pencils out, but the margin depends on your rate and how your utility credits exports. The U.S. average residential price was about 18.83 cents per kWh in April 2026, up 7.3% from a year earlier, according to EIA data reported by Newsweek. EIA’s Short-Term Energy Outlook expects residential prices to keep rising, with the largest increases along the East Coast. Rising rates make each kWh your panels produce more valuable.

Export credits can change the answer. California’s NEM 3.0, effective April 2023, cut average export credit from about 30 cents to about 8 cents per kWh, a roughly 75% reduction, according to Solar.com. Self-consumption and batteries matter more under rules like these, so size the system to your daytime use and ask your utility for its current export rate.

Chart summary: The average credit for power sent to the grid fell from roughly 30¢ to roughly 8¢ per kWh in California, so a system there saves most when you use its output at home or store it in a battery. Check your own utility’s current export rate before sizing a system.

Resale value. A Lawrence Berkeley National Laboratory study of about 22,000 home sales in eight states (1999–2013) found buyers paid about $4 per watt more for homes with host-owned solar, roughly $15,000 for a typical 3.6 kW system. The same research notes the premium appears to shrink as systems age, and it covers owned systems, not leases. See the Berkeley Lab summary. Results vary by market and are not a guarantee.

Before you commit, get at least three written quotes and compare them in our solar ROI calculator using your own bill, rate, and export rules.