Scenario: a 3,500 sq ft home. Assumes 3%/yr rate increases, 0.5%/yr panel degradation and no federal tax credit (the 30% §25D credit ended for systems installed after Dec 31, 2025). How we calculate
Data approachEIA rates · NREL sun hours · 2026 federal policy · methodology
Using floor area as a rough proxy (about 0.45 kWh per sq ft per month), a 3,500 square foot home in Pennsylvania would use about 1,573 kWh per month — about $331/month at Pennsylvania’s average residential rate of 21.04¢/kWh (EIA, Jan–Jul 2026 year-to-date). Real usage varies widely with climate, heating fuel and household size, so size your system from your actual kWh on your utility bills. With 4.2 peak sun hours per day, offsetting that usage takes about a 15.0 kW solar system — roughly 38 panels at 400W — costing about $45,100 installed. With no federal tax credit for 2026 installs and Pennsylvania’s full retail net metering, simple payback is about 13.0 years, with an estimated $72,800 net over 25 years.
How Many Solar Panels for a 3,500 sq ft House in Pennsylvania?
Pennsylvania electricity rates and sun hours change panel count versus the US average:
System size (kW) = Annual kWh ÷ (Peak sun hours × 365 × 0.82)
For 3,500 sq ft in Pennsylvania:
Estimated monthly usage: ~1,573 kWh
Peak sun hours: 4.2 h/day
System size:15.0 kW (~38 × 400W panels)
Metric
Pennsylvania
US average
Rate
21.04¢/kWh
18.19¢/kWh
Sun hours
4.2 h/day
4.5 h/day
System size
15.0 kW
14.0 kW
Panels (400W)
38
35
Pennsylvania requires a larger system than the national average for the same square footage. Use our solar system size calculator with your actual utility bills for a precise ZIP-level result.
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💰 System Cost
What Does Solar Cost for a 3,500 sq ft Home in Pennsylvania in 2026?
At about $3.00/W installed (a blended 2026 US price; marketplace quotes often run lower), a 15.0 kW system in Pennsylvania costs about $45,100.
The 30% federal Residential Clean Energy Credit (IRC §25D) ended for systems installed after December 31, 2025, so a solar system you buy and install in 2026 gets no federal tax credit. Leases and PPAs are different: the installer that owns the system can still claim the commercial §48E credit for systems placed in service by the end of 2027 and may pass part of that value on through a lower monthly price.
📈 Payback Period
How Long Is Solar Payback on a 3,500 sq ft Home in Pennsylvania?
Pennsylvania requires retail-rate net metering, with annual excess paid at the price-to-compare. We assume solar offsets about 87% of this home’s ~$331/month bill — roughly $3,456/year — for a simple payback of about 13.0 years.
Over 25 years, with 3% annual rate increases and 0.5%/year panel degradation, cumulative savings minus the installed cost come to about $72,800. Full retail net metering means each kWh you produce is worth close to your retail rate.
Solar vs utility company · 25-year comparison
25-year totals for a 3,500 sq ft home: 3%/yr rate increases, 0.5%/yr degradation, no federal credit. Methodology
At Pennsylvania's average rate of 21.04¢/kWh and 4.2 peak sun hours, a 3,500 sq ft home (~1,573 kWh/month) typically needs a 15.0 kW system — about 38 panels at 400W. See the [national 3,500 sq ft guide](/guides/how-many-solar-panels-3500-sq-ft-house/) for methodology.
A 15.0 kW system in Pennsylvania costs roughly $45,100 installed. The 30% federal tax credit (25D) ended for systems installed after December 31, 2025, so there is no federal credit for a system you buy in 2026. Pennsylvania has no state solar tax credit; an SREC market provides modest income for solar production.
At $45,100 installed and ~$3,456/year in bill savings, simple payback in Pennsylvania is about 13.0 years. Pennsylvania requires retail-rate net metering, with annual excess paid at the price-to-compare.
With about 13.0-year payback and ~$72,800 estimated 25-year net savings, it is a reasonable case in 2026. Equivalent monthly bill: **~$331** — compare the [$300/month bill guide](/guides/solar-panels-300-month-electric-bill/) for bill-based sizing.
The US average needs a 14.0 kW system at 16.3-year payback. Pennsylvania needs 15.0 kW with 13.0-year payback at 21.04¢/kWh and 4.2 sun hours.
$300/month electric bill by state
System size and payback vary by electricity rate and sun hours — see your state.
21.04¢/kWh — Pennsylvania average residential price. Source: EIA Electric Power Monthly, Table 5.6.B (year-to-date through July 2026), residential average retail price (July 2026) (EIA)
Solar production
4.2 peak sun hours/day × 0.82 system derate. Approximate state-average daily solar resource (peak sun hours) based on NREL solar resource data (NSRDB); not location-specific — use NREL PVWatts for an address-level estimate. (NREL PVWatts)
Installed price
$3.00 per watt before incentives. Blended 2026 US residential installed price used by this site; EnergySage marketplace reported about $2.60/W (mid-2026); full-market medians are higher.
Federal tax credit
$0 for homeowner-owned systems installed in 2026 — the 30% §25D credit ended Dec 31, 2025 (IRS)
Net metering
Full retail net metering — solar assumed to offset 87% of the bill. Pennsylvania requires retail-rate net metering, with annual excess paid at the price-to-compare.
Square footage
Used only as a rough usage proxy: 3,500 sq ft × 0.4495 kWh/sq ft/month. EIA: average US residential customer used about 899 kWh/month (2022). Site assumption: that usage corresponds to a ~2,000 sq ft home (0.45 kWh per sq ft per month). Square footage is only a rough proxy — size from your actual kWh.
Estimates only — not tax, legal or financial advice. Get at least three installer quotes and confirm incentives with your utility and a tax professional.