US residential solar · 2026 data

Solar Panels for 700 kWh/Month

Q: How much does a solar system for 700 kWh per month cost in 2026?

Roughly $13,000 to $23,000 before incentives, depending on how many panels your location requires. At about $2.75 per watt, the typical 6.4 kW system costs around $17,600. EnergySage marketplace data puts the 2026 average near $2.60 per watt, while other datasets report medians closer to $3. The federal 30% homeowner credit (Section 25D) ended for expenditures after December 31, 2025, so cash and loan buyers in 2026 should not assume it. State, local and utility incentives may still apply.

Q: How long does it take for solar to pay for itself at 700 kWh per month?

About 11 to 12 years at the 2026 U.S. average residential rate of roughly 18.3 cents per kWh, using the typical 6.4 kW system at $17,600 with no incentives. Payback is about 16 years at 13 cents, 9 years at 24 cents, and 6 years at 35 cents, assuming you receive full retail value for your solar power. States that credit exports below the retail rate, such as California under NEM 3.0, can take longer unless you use more of your solar power on site or add a battery.

Q: Is solar worth it if I only use 700 kWh per month?

Often yes, if your rate is at or above the national average, your roof is unshaded, and you will stay in the home for 12 or more years. In our model (6.4 kW, $17,600, 18 cents per kWh flat, 0.5% annual panel degradation), cumulative savings pass the system cost around year 12 and reach about $18,000 net after 25 years; with 2% annual rate increases the net is about $27,800. It is less compelling in low-rate states, with poor export credits, or if you may move soon. The model excludes financing costs, maintenance and inverter replacement.

Q: Do I need a battery with a 700 kWh per month solar system?

Usually not for savings alone. Under full retail net metering the grid acts as your storage, so a battery rarely pays for itself. A battery makes more sense if your utility has steep time-of-use rates, pays low credits for exported power, or if you want backup during outages. The 30% federal credit for homeowner-owned batteries also ended after 2025, so price the battery on its own merits.

Est. net savings

$18,000

Over 25 Years (modeled estimate) · no federal credit

$17,600 Typical cost (no federal credit)

11.6 yrs Simple payback

6.4 kW System size

Typical result:

~16 panels (12–21 by location)
6.4 kW typical system
~$17,600 before incentives
~11.6 year simple payback

✓ EIA rates & NREL sun data ✓ 2026 federal policy applied ✓ Open methodology

Updated October 3, 2026 · 9 min read ·By Green Energy Calculators Editorial Team

Calculate My System Size View State Data

25 years without solar vs with solar

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

Without solar

25-year utility bills

$35,600

Rates rise ~3% per year

With solar

System cost + remaining bills

$17,600

Installed cost, no federal credit

Difference

Estimated 25-year net

+$18,000

Before any state or utility incentives

Author Green Energy Calculators Editorial Team

Editorial policy No paid placements

Last updated Oct 3, 2026

Data approach EIA rates · NREL sun hours · 2026 federal policy · methodology

A home using 700 kWh per month needs about 16 solar panels (roughly 6.4 kW with 400W modules) at the U.S.-average 4.5 peak sun hours. The real number depends on where you live: about 12 panels in Phoenix and about 21 in Seattle. At roughly $2.75 per watt, a typical 6.4 kW system costs about $17,600 before incentives, and in 2026 there is no federal tax credit for homeowners who buy with cash or a loan.

700 kWh per month equals about 8,400 kWh per year, or about 23 kWh per day. At the 2026 U.S. average residential rate of roughly 18.3 cents per kWh (EIA, June 2026), that is about $128 per month on the electric bill. The three variables that move your panel count are your local peak sun hours, the wattage of the panels you choose, and your system’s real-world efficiency after inverter, wiring and temperature losses (usually 0.75 to 0.80 for a grid-tied system).

How Many Solar Panels Do You Need for 700 kWh/Month?

Divide your daily kWh by your location’s peak sun hours and system efficiency to get the system size in kW, then divide by the panel’s kW rating and round up.

Formula: Panels needed = Daily kWh ÷ (Peak sun hours × System efficiency) ÷ Panel kW

Worked example (U.S. average, 4.5 sun hours, 400W panels, 0.80 efficiency): 23.0 ÷ (4.5 × 0.80) = 6.4 kW, and 6.4 ÷ 0.40 = 16 panels.

City	Peak sun hours/day*	Required system size	400W panels needed
Phoenix, AZ	6.5	4.4 kW	12
Dallas, TX	5.4	5.3 kW	14
Atlanta, GA	4.8	6.0 kW	15
New York, NY	4.1	7.0 kW	18
Chicago, IL	4.1	7.0 kW	18
Seattle, WA	3.5	8.2 kW	21

*Rounded annual averages consistent with NREL-based city tables; check your exact address in NREL’s PVWatts calculator, which also models roof tilt, direction and shading.

400W panels needed for 700 kWh/month by city. Phoenix needs about 12 panels and Seattle about 21 at 23.0 kWh a day and 0.80 system efficiency. Source: NREL-based peak sun hours, modeled.

Chart summary: The same 700 kWh/month home needs about 12 panels in Phoenix and about 21 in Seattle, roughly 75% more, because of sunshine alone. Counts use rounded annual peak sun hours (Phoenix 6.5, Dallas 5.4, Atlanta 4.8, New York and Chicago 4.1, Seattle 3.5), which are approximations. Verify your own address in NREL PVWatts.

Use our solar system size calculator to enter your ZIP code and get a panel count for your roof.

Run the numbers for your state

The savings calculator loads your state's average electricity rate, sun hours and net-metering rule. Then enter your own bill and installer quote.

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What Does a Solar System for 700 kWh/Month Cost in 2026?

Residential solar commonly prices at about $2.50 to $3.50 per watt installed before incentives. EnergySage marketplace data puts the 2026 average near $2.60 per watt, with smaller systems costing more per watt (about $2.78/W for a 5 kW system versus about $2.56/W for 12 kW). Other datasets, such as Lawrence Berkeley National Laboratory’s Tracking the Sun report, show higher medians closer to $3 per watt. We use $2.75 per watt as a middle-of-the-range assumption.

Location	Panels (400W)	System size	Estimated cost at $2.75/W
Phoenix, AZ	12	4.8 kW	~$13,200
Dallas, TX	14	5.6 kW	~$15,400
Atlanta, GA	15	6.0 kW	~$16,500
U.S. average sun (4.5 hrs)	16	6.4 kW	~$17,600
New York / Chicago	18	7.2 kW	~$19,800
Seattle, WA	21	8.4 kW	~$23,100

These are modeled estimates before any incentives, financing costs or local price differences. Actual quotes vary by installer, equipment, roof complexity and state; Arizona, for example, tends to price below the national average and Massachusetts above it.

Run your numbers with our solar payback calculator.

Solar vs utility company · 25-year comparison

25-year totals: 3%/yr rate increases, 0.5%/yr degradation, no federal credit. Methodology

Total utility payments

$35,600

Total solar cost (installed + remaining bills)

$17,600

Net savings

+$18,000

Avg. monthly difference

+$126/mo

See my savings →

Is There Still a Federal Solar Tax Credit in 2026?

Not for homeowners who buy with cash or a loan. The 30% Residential Clean Energy Credit (Section 25D) was ended by the One Big Beautiful Bill Act, signed July 4, 2025, for expenditures made after December 31, 2025. Treasury and IRS guidance treats the expenditure as made when installation is completed, so a 2025 deposit on a system finished in 2026 does not qualify. Systems fully installed in 2025 can still claim the credit on the 2025 tax return.

What may still help in 2026:

State, local and utility incentives, such as state tax credits, rebates or property tax exemptions. Check DSIRE for your state.
Leases and power purchase agreements (PPAs). The third-party owner may claim a commercial credit (Section 48E) under deadlines that run into 2027, and terms vary by provider, so ask how any savings are passed through to you.
Net metering or net billing credits for exported power, which differ by utility.

Many web pages still advertise a 30% credit “through 2032.” For homeowner-owned systems installed in 2026, that is outdated; confirm with the IRS and a tax professional. This article is general information, not tax or financial advice.

How Long Does Solar Take to Pay Back at 700 kWh/Month?

Simple payback is system cost divided by annual bill savings. For the typical 6.4 kW system ($17,600) offsetting 8,400 kWh per year, the answer depends mostly on what you pay per kWh.

Simple payback by electricity rate for a 6.4 kW system. A $17,600 system offsetting 8,400 kWh a year pays back in about 11.6 years at the 18¢ U.S. average. Source: EIA 2026 state rates, EnergySage 2026 pricing, modeled.

Chart summary: Payback runs from about 16 years at 13¢ per kWh to about 6 years at 35¢, with the 18¢ U.S. average landing near 11.6 years. The bars assume full retail value for every kWh, flat rates, no incentives and no financing. Where utilities credit exports below the retail rate (California under NEM 3.0, for example), real payback will be longer than shown unless you use more solar on site or add storage.

To see how the cash flow builds year by year, the next chart tracks the same 6.4 kW system over 25 years under two rate scenarios.

25-year cumulative cash flow for a 6.4 kW system. A $17,600 system with no federal credit breaks even near year 12 and nets about $18,000 by year 25 at a flat 18¢/kWh. Source: EIA 2026 rates, EnergySage 2026 pricing, modeled.

Chart summary: At a flat 18¢ per kWh, cumulative savings pass the $17,600 system cost around year 12 and reach about $18,000 net by year 25. If utility rates rise 2% a year (an assumption, not a forecast), break-even moves to about year 11 and the 25-year net rises to about $27,800. Both lines assume 8,400 kWh in year one, 0.5% annual panel degradation, and no financing, maintenance or inverter replacement.

How to Reduce 700 kWh Usage Before Sizing Your Solar System

Sizing a system against an inflated bill is a common and avoidable mistake. Using the formula above, every 50 kWh per month you cut reduces the required system by about 0.46 kW, roughly one 400W panel or about $1,250 at $2.75 per watt.

Where to look first:

Water heating. Heat pump water heaters are two to three times as efficient as conventional electric resistance tanks, according to the U.S. Department of Energy. The federal efficiency credit for them (Section 25C) also ended after 2025, so check state and utility rebates.
Heating and cooling. Thermostat schedules, duct sealing, air sealing and attic insulation reduce run time.
Always-on loads. Old refrigerators, second freezers, pool pumps and standby electronics add up over a year.

Pull 12 months of kWh from your utility bills before sizing; a summer-only bill can overstate or understate your annual need. Our smart thermostat savings calculator can help estimate savings on the cooling and heating side.

Should You Add a Battery to a 700 kWh/Month Solar System?

For bill savings alone, a battery is usually a hard sell. Under full retail net metering, the utility effectively stores your excess solar for free, so a battery adds cost without adding much bill savings. Industry estimates put home batteries at roughly $7,000 to $18,000 installed, and the 30% federal credit for homeowner-owned batteries ended after 2025.

A battery becomes more attractive in three cases:

Time-of-use rates with expensive evening peaks, where stored solar offsets the priciest hours.
Low export credits, such as California’s NEM 3.0, where self-consuming solar is worth more than exporting it.
Outage protection, which has real value that a payback calculation will not capture.

If you are unsure, install solar first and design the system so a battery can be added later. Use our battery storage calculator to test your own rate plan.

How to Get the Best Price on a Solar System for 700 kWh/Month

Installed prices vary widely by installer, so collect at least three written quotes for the same system size. Marketplaces such as EnergySage can help you compare quotes side by side.

Compare this	Why it matters
Price per watt (installed)	The cleanest way to compare quotes of different sizes; benchmark against about $2.50–$3.50/W
Panel wattage and brand	Higher-wattage panels need fewer modules for the same kW
Inverter type	String inverters cost less; microinverters or optimizers help on shaded roofs
Product and performance warranty	Panels commonly carry long warranties; confirm the terms in writing
Workmanship (labor) warranty	Varies widely by installer; ask for years covered and who honors it
Incentives and net metering	Confirm which state, local and utility programs apply to your address

Bring 12 months of kWh history to every consultation, and ask each installer to show the production estimate (kWh per year) behind its panel count. A system sized to your actual consumption, not an upsell, protects your return. Use our solar savings calculator to estimate first-year savings before you talk to installers.

Methodology and Sources

Last updated October 3, 2026. Figures are modeled estimates for a typical grid-tied home, not quotes or financial advice.

Model inputs: 700 kWh/month = 8,400 kWh/year (23.0 kWh/day); 0.80 system efficiency; 400W panels; $2.75/W installed; 0.5% annual panel degradation; no incentives, financing, maintenance or inverter replacement.
Electricity rates: EIA Electric Power Monthly, Table 5.6.A; the U.S. residential average was about 18.3¢/kWh in mid-2026.
Solar pricing: EnergySage solar panel cost data (2026 average about $2.60/W); Lawrence Berkeley National Laboratory’s Tracking the Sun report for higher medians.
Peak sun hours: rounded annual averages derived from NREL solar resource data; use NREL PVWatts for your address.
Federal tax credit: Section 25D as amended by the One Big Beautiful Bill Act (July 4, 2025); see IRS guidance.
State incentives: DSIRE database.

Frequently asked questions

Direct answers for US homeowners — sized for a $128/month electric bill.

How many solar panels do I need to offset 700 kWh per month?

About 16 panels of 400W (a 6.4 kW system) at the U.S.-average 4.5 peak sun hours. The count depends mostly on sunshine: roughly 12 panels in Phoenix, 14 in Dallas, 15 in Atlanta, 18 in New York or Chicago, and 21 in Seattle. The formula is daily kWh (about 23) divided by peak sun hours times 0.80 system efficiency, divided by the panel's kW rating, rounded up. Higher-wattage panels reduce the count; shade, roof direction and tilt can increase it.

How much does a solar system for 700 kWh per month cost in 2026?

How long does it take for solar to pay for itself at 700 kWh per month?

Is solar worth it if I only use 700 kWh per month?

Do I need a battery with a 700 kWh per month solar system?

Same usage, bill-based guide

Your 700 kWh/Month target maps to roughly a $125/month electric bill nationally.

$125 $125/month electric bill guide Panels · cost · payback · by state →

Popular state solar guides

Electricity rates and incentives vary — see data for your state.

CA California 33.25¢/kWh · 5.8h sun TX Texas 16.06¢/kWh · 5.6h sun FL Florida 15.3¢/kWh · 5.7h sun AZ Arizona 15.44¢/kWh · 6.5h sun NC North Carolina 14.94¢/kWh · 5.2h sun NY New York 29.38¢/kWh · 4.3h sun MA Massachusetts 30.14¢/kWh · 4.2h sun CO Colorado 16.72¢/kWh · 5.5h sun

View all 50 states →

How these numbers were calculated

Electricity rate: 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).
Model: Version 2026.10 · 3%/yr electricity price escalation · 0.5%/yr panel degradation · simple payback = installed cost ÷ year-1 savings
Policy checked: September 29, 2026 · Full methodology · Report an error

Estimates only — not tax, legal or financial advice. Get at least three installer quotes and confirm incentives with your utility and a tax professional.