How much does a typical residential solar system cost in 2026?

DOE + SEIA 2026 benchmarks: ~$3.00/W installed for residential. A typical 7-kW system costs ~$21,000 before the federal ITC; ~$14,700 net after the 30% credit. Costs vary by state ±20% — California + Hawaii higher (labor + permit-friction); Texas + Arizona lower (less regulation). Quote 2-3 installers to get an accurate local number.

What's the 30% federal Investment Tax Credit (ITC)?

IRS Section 25D residential ITC: 30% of qualified solar costs deductible from federal tax liability. Extended through 2032 by the Inflation Reduction Act (2022). On a $21,000 system, you save $6,300 on your federal taxes the year of installation. You must have at least $6,300 of federal tax liability to claim it; excess carries forward up to 5 years.

How is system size calculated?

system_size_kW = annual_kWh / (365 × peak_sun_hours × derate × orientation_factor). The 'derate' accounts for inverter, wiring, soiling losses (~15%). Example: 12,000 kWh/year in Texas (5.5 hours peak sun) with south-facing roof: 12,000 / (365 × 5.5 × 0.85 × 1.0) = 7.0 kW system. Roof area can constrain it below this if space-limited.

What's the difference between this and the Solar ROI calculator?

This calculator (Solar Panel Cost) focuses on the COST side — system size, total cost, after-ITC cost, payback, 25-year savings. The Solar ROI calculator goes deeper: IRR computation, battery option, net-metering policy, electricity-price escalation, panel degradation, and full lifetime simulation. Start here for a quick cost estimate; use Solar ROI for installation-decision-grade analysis.

What are peak sun hours?

Peak sun hours = the number of hours per day when solar irradiance averages 1,000 W/m² (the rated panel output condition). NREL's PVWatts calculator publishes state averages: AZ/NV/NM 6.0-6.5 hr; CA/HI 5.7-5.8 hr; TX/FL 5.4-5.5 hr; northern states (NY/MA/MI) 4.0; PNW (WA/OR) 3.5-4.0; AK 3.0. The calculator uses state averages; your specific location can vary ±15%.

Does roof orientation really matter?

Yes — significantly. South-facing (Northern Hemisphere) is 100% optimal. East or west: 80% of optimal. North: 50% (rarely worth it). Flat roofs are 90% (panels tilted at ~10°). The orientation factor is a multiplier on peak sun hours. East-vs-west matters less than people think; both lose ~20% but at different times of day (east = morning generation, west = afternoon).

What's the typical payback period?

Highly state-dependent. Sun-rich + high-electric-rate states (CA, HI, AZ): 4-6 years. Mid-tier states (TX, FL, NV): 6-9 years. Low-sun or low-rate states (WA, ND, MN): 9-15 years. With battery + low net-metering credit: typically +2-3 years longer. Payback under 7 years is strong; 7-12 is reasonable; over 15 is marginal.

Does the calculator include net metering?

Not directly. The 'annual savings' line assumes you offset your full electric bill with generated power. In reality, net-metering policies vary: some utilities pay full retail rate for surplus (best); some pay wholesale rate (much lower); some don't allow grid sell-back at all. For accurate state-policy analysis, use the Solar ROI calculator which supports NEM variants.

What about state rebates and incentives?

Not included in this calculator (state policies change frequently). Many states + utilities offer: cash rebates ($500-2,500), property tax exemptions, sales tax exemptions on equipment, SREC (Solar Renewable Energy Credit) markets in MD/NJ/MA/PA. Check the DSIRE database (dsireusa.org) for your specific state. State incentives can shorten payback by 1-3 years.

What about panel degradation over time?

Panels typically lose ~0.5%/year of output capacity. Tier-1 manufacturer warranties guarantee 80-85% output at year 25. The calculator's 25-year savings assumes flat output (no degradation), which is roughly correct for a 25-year-old system at ~88% original output. For exact modeling, use the Solar ROI calculator (which incorporates LBNL field-study degradation curves).

Should I add battery storage?

Depends on state. Battery (e.g., Tesla Powerwall ~$11,000 installed, post-ITC ~$7,700) adds $2,500-4,000/year of value in states with poor net-metering (CA NEM 3.0) or frequent outages (TX). In strong net-metering states (NY, NJ, MA), battery payback is often 15+ years — not worth it for most. Run the Solar ROI calculator with the battery toggle to see your specific economics.

How long does installation take?

Typical timeline: 2-4 weeks from contract to install for a residential rooftop system. Site survey (1-3 days), permitting (1-4 weeks depending on jurisdiction), installation (1-3 days on-site), utility inspection + interconnection (1-2 weeks). Total elapsed time: 1-2 months. Faster in solar-friendly states; slower in CA + NY + NJ where permits are complex.

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Solar Panel Cost Calculator — System Size + 30% ITC + Payback (2026)

Drop monthly bill, state, roof orientation, and electric rate — get sized system in kW, total installed cost, federal 30% ITC, net after-credit cost, payback years, and 25-year net savings. For full IRR + battery + NEM modeling, see the Solar ROI calculator.

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Reviewed by CalcBold Editorial · Sources: SEIA US Solar Market Insight 2026 + DOE NREL residential solar cost benchmarks + IRS Form 5695 (Residential Energy Credits)Last verified May 15, 2026Methodology

Monthly electric bill

Pre-solar average. Used to estimate annual kWh and size the system to cover it.

State

Peak sun hours (NREL PVWatts daily average) vary 2x across US states. AZ/NM/NV best; WA/AK worst.

Roof orientation

Northern Hemisphere. South-facing is optimal; east/west loses ~20%. North-facing is rarely worth installing.

Available roof area

Usable roof area for panels. Typical panel = 17.5 sq ft @ ~400W. If your roof can't fit the needed system, the calculator caps it.

Electric rate ($/kWh)

Your effective $/kWh rate. Check your utility bill. National average ~$0.16; HI $0.45; LA $0.11.

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Frequently Asked Questions

The most common questions we get about this calculator — each answer is kept under 60 words so you can scan.

How much does a typical residential solar system cost in 2026?
DOE + SEIA 2026 benchmarks: ~$3.00/W installed for residential. A typical 7-kW system costs ~$21,000 before the federal ITC; ~$14,700 net after the 30% credit. Costs vary by state ±20% — California + Hawaii higher (labor + permit-friction); Texas + Arizona lower (less regulation). Quote 2-3 installers to get an accurate local number.
What's the 30% federal Investment Tax Credit (ITC)?
IRS Section 25D residential ITC: 30% of qualified solar costs deductible from federal tax liability. Extended through 2032 by the Inflation Reduction Act (2022). On a $21,000 system, you save $6,300 on your federal taxes the year of installation. You must have at least $6,300 of federal tax liability to claim it; excess carries forward up to 5 years.
How is system size calculated?
system_size_kW = annual_kWh / (365 × peak_sun_hours × derate × orientation_factor). The 'derate' accounts for inverter, wiring, soiling losses (~15%). Example: 12,000 kWh/year in Texas (5.5 hours peak sun) with south-facing roof: 12,000 / (365 × 5.5 × 0.85 × 1.0) = 7.0 kW system. Roof area can constrain it below this if space-limited.
What's the difference between this and the Solar ROI calculator?
This calculator (Solar Panel Cost) focuses on the COST side — system size, total cost, after-ITC cost, payback, 25-year savings. The Solar ROI calculator goes deeper: IRR computation, battery option, net-metering policy, electricity-price escalation, panel degradation, and full lifetime simulation. Start here for a quick cost estimate; use Solar ROI for installation-decision-grade analysis.
What are peak sun hours?
Peak sun hours = the number of hours per day when solar irradiance averages 1,000 W/m² (the rated panel output condition). NREL's PVWatts calculator publishes state averages: AZ/NV/NM 6.0-6.5 hr; CA/HI 5.7-5.8 hr; TX/FL 5.4-5.5 hr; northern states (NY/MA/MI) 4.0; PNW (WA/OR) 3.5-4.0; AK 3.0. The calculator uses state averages; your specific location can vary ±15%.
Does roof orientation really matter?
Yes — significantly. South-facing (Northern Hemisphere) is 100% optimal. East or west: 80% of optimal. North: 50% (rarely worth it). Flat roofs are 90% (panels tilted at ~10°). The orientation factor is a multiplier on peak sun hours. East-vs-west matters less than people think; both lose ~20% but at different times of day (east = morning generation, west = afternoon).
What's the typical payback period?
Highly state-dependent. Sun-rich + high-electric-rate states (CA, HI, AZ): 4-6 years. Mid-tier states (TX, FL, NV): 6-9 years. Low-sun or low-rate states (WA, ND, MN): 9-15 years. With battery + low net-metering credit: typically +2-3 years longer. Payback under 7 years is strong; 7-12 is reasonable; over 15 is marginal.
Does the calculator include net metering?
Not directly. The 'annual savings' line assumes you offset your full electric bill with generated power. In reality, net-metering policies vary: some utilities pay full retail rate for surplus (best); some pay wholesale rate (much lower); some don't allow grid sell-back at all. For accurate state-policy analysis, use the Solar ROI calculator which supports NEM variants.
What about state rebates and incentives?
Not included in this calculator (state policies change frequently). Many states + utilities offer: cash rebates ($500-2,500), property tax exemptions, sales tax exemptions on equipment, SREC (Solar Renewable Energy Credit) markets in MD/NJ/MA/PA. Check the DSIRE database (dsireusa.org) for your specific state. State incentives can shorten payback by 1-3 years.
What about panel degradation over time?
Panels typically lose ~0.5%/year of output capacity. Tier-1 manufacturer warranties guarantee 80-85% output at year 25. The calculator's 25-year savings assumes flat output (no degradation), which is roughly correct for a 25-year-old system at ~88% original output. For exact modeling, use the Solar ROI calculator (which incorporates LBNL field-study degradation curves).
Should I add battery storage?
Depends on state. Battery (e.g., Tesla Powerwall ~$11,000 installed, post-ITC ~$7,700) adds $2,500-4,000/year of value in states with poor net-metering (CA NEM 3.0) or frequent outages (TX). In strong net-metering states (NY, NJ, MA), battery payback is often 15+ years — not worth it for most. Run the Solar ROI calculator with the battery toggle to see your specific economics.
How long does installation take?
Typical timeline: 2-4 weeks from contract to install for a residential rooftop system. Site survey (1-3 days), permitting (1-4 weeks depending on jurisdiction), installation (1-3 days on-site), utility inspection + interconnection (1-2 weeks). Total elapsed time: 1-2 months. Faster in solar-friendly states; slower in CA + NY + NJ where permits are complex.

Solar Panel Cost Calculator

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Frequently Asked Questions