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
Offsetting 2,000 kWh per month with solar panels takes a system of about 13 to 23 kW, or roughly 32 to 58 panels at 400W, depending on where you live. A Phoenix homeowner needs far fewer panels than a Seattle homeowner to reach the same monthly production. The three biggest variables are your local peak sun hours, the panel wattage, and real-world system losses.
Quick answer: at the US-typical 4.5 peak sun hours, a 2,000 kWh/month home needs about an 18.5 kW system (46 panels at 400W). At the 2026 average price of about $2.60 per watt, that is roughly $48,100 before incentives. The 30% federal homeowner credit ended on December 31, 2025, so for most buyers the price you see is the price you pay, less any state or utility incentives.
What System Size Do You Actually Need for 2,000 KWh Per Month?
Divide your monthly usage by your location’s average peak sun hours per day, by 30 days, and by 0.80 for real-world system efficiency.
System size (kW) = Monthly kWh ÷ (Peak Sun Hours × 30 × 0.80)
Boston, MA (about 4.2 peak sun hours): 2,000 ÷ (4.2 × 30 × 0.80) = 19.8 kW
The 0.80 factor is a conservative planning margin for inverter, wiring, temperature and soiling losses. NREL’s PVWatts default assumes 14% losses (about 0.86), so a PVWatts run at default settings will usually return a system roughly 7% smaller.
Data visualization
System size needed to produce 2,000 kWh/month, by city. Seattle needs about 23.1 kW versus 12.8 kW in Phoenix, using annual-average peak sun hours of 6.5, 5.2, 5.0, 4.2 and 3.6 (rounded). Source: NREL PVWatts solar resource data, 2026; formula above.
Chart summary: Phoenix needs about 12.8 kW, while Seattle needs about 23.1 kW, roughly 80% more capacity for the same 2,000 kWh/month. Dallas (16.0 kW) and Atlanta (16.7 kW) fall in the middle, and Boston needs about 19.8 kW. Bar colors run from green (smaller system) to red (larger system); sunshine, not home size, drives the spread.
Will it fit on your roof? A 400W panel covers roughly 20 to 22 square feet, so 41 to 58 panels need about 850 to 1,250 square feet of unshaded roof. If your roof is smaller, higher-wattage panels or a ground mount can close the gap.
Seasons matter. These figures use annual averages. A system sized for a full annual offset will overproduce in summer and underproduce in winter, which is why net metering rules matter (see below).
⚡ System Size
How Much Does a 2,000 kWh/Month Solar System Cost in 2026?
EnergySage’s 2026 marketplace data puts the average quoted price at about $2.60 per watt before incentives, with a typical 12 kW system averaging about $31,135. The chart applies a $2.50 to $3.00 per watt range, which brackets that average, to each city’s system size. Your quotes will differ by state, equipment, roof type and installer.
Data visualization
Estimated installed cost of a 2,000 kWh/month system, by city, before incentives. A Seattle system runs about $57,900 to $69,400 versus $32,100 to $38,500 in Phoenix, calculated as system size (previous chart) × $2.50 and $3.00 per watt. Source: EnergySage 2026 marketplace pricing.
Chart summary: Estimated costs run from about $32,100 to $38,500 in Phoenix up to about $57,900 to $69,400 in Seattle. Lower sunshine means a bigger system and a higher price for the same monthly output. At the $2.60 per watt average, the US-typical 18.5 kW system costs about $48,100; the federal homeowner credit is not subtracted because it ended in 2025.
The federal credit has ended. The 30% Residential Clean Energy Credit (Section 25D) ended for expenditures after December 31, 2025 under the One Big Beautiful Bill Act, and it covered home batteries too. Systems you buy with cash or a loan in 2026 get no federal homeowner credit. Third-party-owned systems (leases and PPAs) may be able to use a different commercial credit, subject to ownership, timing and sourcing rules, so ask any provider how its pricing reflects that.
State and local incentives still exist. Property tax exemptions, sales tax exemptions, state credits and utility programs vary widely. Search your state in DSIRE and confirm with your installer. Get at least three quotes at this system size; price per watt differs between installers.
How Long Does a 2,000 kWh/Month Solar System Take to Pay Back?
At EIA’s 2026 national residential average of about 18¢/kWh, 2,000 kWh a month is worth about $360 per month, or $4,320 in year one. Against a $48,100 system, simple payback with no rate growth is about 11.1 years. With electricity prices rising 2.5% a year and panels losing 0.5% output a year, break-even moves to about 10.2 years.
Data visualization
Modeled 25-year cumulative cash flow for an 18.5 kW system costing $48,100. Cash flow turns positive in year 11 and reaches about $90,000 by year 25, assuming 24,000 kWh/year, 18 cents per kWh in year one, 2.5% yearly electricity price growth and 0.5% yearly panel degradation, with no incentives or financing. Source: EIA 2026 residential average; EnergySage 2026 pricing.
Chart summary: Cumulative cash flow starts at about -$48,100, crosses zero during year 11 (about 10.2 years), and reaches roughly +$90,000 by year 25. The line assumes electricity prices rise 2.5% a year; with flat prices, break-even moves out to about 11.1 years. Real results will be lower if you finance the system or replace an inverter.
Your electricity rate is the biggest lever. The table applies the same $48,100 system and 24,000 kWh/year to different state rates, with no rate growth.
Rate (¢/kWh)
Example (EIA, mid-2026)
Simple payback
12.7
Louisiana (lowest state, July)
15.8 years
15.2
Arizona (June)
13.2 years
15.9
Texas (July)
12.6 years
18.0
US average
11.1 years
24.3
Connecticut (June)
8.2 years
34.7
California (June)
5.8 years
California’s figure assumes retail-rate credit for all production. Under its net billing rules, exported power earns less than retail, so real payback there is longer.
⚡ System Size
Does Net Metering Affect Whether a 2,000 kWh/Month Offset Is Feasible?
Yes. Net metering is what lets a full-offset system work without batteries. Solar produces mostly at midday and your home uses power around the clock, so surplus daytime production is credited against evening and winter use. Under full retail net metering, that credit is worth about the same as the power you buy.
Some states and utilities have moved to net billing, where exports earn a lower rate than retail. California’s NEM 3.0 is the best-known example, and Arizona and Nevada also credit exports at reduced rates. In those markets, using more solar power at home, through time-of-use shifting or a home battery, matters more. A battery adds cost and, since the federal homeowner credit ended, no longer qualifies for a 25D credit.
Rules change often. Check your utility’s current tariff and DSIRE’s state summary before choosing a system size, and ask whether your utility caps system size relative to your past usage. For nearby usage levels, see our guides for 1,750 kWh/month and 1,500 kWh/month.
📋 Key Insights
How to Finance a Large Solar System in 2026
At roughly $33,000 to $60,000 before incentives, financing affects total return nearly as much as system size.
Cash purchase has no interest cost and the highest lifetime return. It suits homeowners with savings and a long time horizon.
Solar loan means $0 down and you own the system, but interest adds to the cost. As an arithmetic example (not a quote), financing $48,100 at 7.5% over 20 years costs about $388 per month and roughly $44,900 in total interest. Compare that with the roughly $360 monthly bill the system replaces, and get actual rates from lenders.
Lease or PPA requires little or no upfront cost, but you do not own the system. Contract terms, escalators and transfer rules vary, so compare the total cost over the full term against buying.
Trimming usage before you size helps. Cutting 10% (200 kWh/month) with efficiency upgrades reduces the system by about 1.9 kW, or 4 to 5 panels, and roughly $4,800 at $2.60 per watt. Use our solar payback calculator to test your own numbers.
📋 Key Insights
Sources and Methodology
Peak sun hours: NREL’s PVWatts calculator. City values are rounded annual averages for a tilt-at-latitude south-facing array; look up your exact address.
Electricity prices: U.S. Energy Information Administration, Electric Power Monthly (residential averages, 2026).
Installed cost: EnergySage 2026 marketplace data, about $2.60 per watt before incentives.
Federal credit status: One Big Beautiful Bill Act (Public Law 119-21), which ended Section 25D for expenditures after December 31, 2025.
Model: system size = kWh ÷ (peak sun hours × 30 × 0.80). Payback uses 24,000 kWh/year, 18¢/kWh, 2.5% annual price growth and 0.5% annual degradation. These are planning estimates, not quotes or guarantees.
Related calculators
Free tools for US homeowners — instant results, all 50 states.
Direct answers for US homeowners — sized for a $360/month electric bill.
Most US homes need about 32 to 58 panels of 400W each, which is a 13–23 kW system. Phoenix needs roughly 32 panels (12.8 kW) and Seattle roughly 58 (23.1 kW). At the US-typical 4.5 peak sun hours, the answer is about 46 panels at 400W or 41 at 450W (18.5 kW). Peak sun hours are the biggest variable, followed by panel wattage and system losses.
At about $2.60 per watt (EnergySage 2026 marketplace average), an 18.5 kW system costs roughly $48,100, and city-level systems range from about $33,300 to $60,200. The 30% federal Residential Clean Energy Credit (Section 25D) ended for expenditures after December 31, 2025, so a system you buy in 2026 gets no federal homeowner credit. State, local and utility incentives may still apply, so check DSIRE.
At about 18¢/kWh and 2.5% yearly rate growth, an 18.5 kW system costing $48,100 breaks even in about 10.2 years and saves roughly $90,000 over 25 years before financing costs and inverter replacement. Payback depends mostly on your electricity rate: the same system pays back in about 5.8 years at 34.7¢/kWh (California average) and about 15.8 years at 12.7¢/kWh (Louisiana), if exports are credited at the retail rate.
A 400W panel covers about 20 to 22 square feet, so 41 to 58 panels need roughly 850 to 1,250 square feet of unshaded, suitable roof. If your roof is too small or shaded, options include higher-wattage panels, a ground mount, or cutting usage first with efficiency upgrades. A 10% cut in usage trims about 4 to 5 panels.
Net metering makes a full offset practical because daytime surplus is credited against nighttime use. Some states and utilities, including California under NEM 3.0, now pay lower rates for exported power, which lengthens payback and makes self-consumption and batteries more valuable. Check your utility's current export rate and DSIRE's state summary before choosing a system size.
Same usage, bill-based guide
Your 2,000 kWh/Month target maps to roughly a $350/month electric bill nationally.
18.19¢/kWh — US 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
4.5 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
National blend — solar assumed to offset 75% of the bill (87% in full-retail net-metering states, 55–70% elsewhere).
Estimates only — not tax, legal or financial advice. Get at least three installer quotes and confirm incentives with your utility and a tax professional.