Solar Calculators for Phoenix, Arizona

Q: What should I verify before signing a solar contract in Phoenix?

Confirm that the quote names your actual utility, uses a recent electricity rate, includes measured shade and roof-condition findings, and explains who handles permits and interconnection. Ask the installer to separate guaranteed equipment and workmanship terms from estimated production, incentives, and savings.

Free tools with illustrative Phoenix planning inputs. Replace energy rates and installation costs with your bill and written quote.

Quick answer

Start with your exact utility account and roof design. The 6 sun hours and 13.5 cents/kWh below are planning assumptions, not verified current rates for Phoenix. Confirm APS / SRP eligibility and export settlement.

Notes updated 2026-07-26

Best for: Phoenix homeowners comparing a proposal or estimating savings before calling installers.
Inputs needed: 12-month kWh usage, roof shade, APS / SRP, quoted $/W
Formula used: Local production = system kW × local peak sun hours × 365, then adjusted for losses.
Method references: NREL PVWatts, APS / SRP, Arizona incentive rules

Peak sun hours

hrs/day planning assumption

Illustrative energy rate

13.5¢

per kWh (APS / SRP)

Typical install cost

$2.65/W

planning assumption, not a market median

Net metering policy: Net billing (exports < retail)

What Phoenix homeowners should check

Phoenix roofs receive intense year-round sun, but extreme summer heat raises module operating temperatures and can reduce midday output. Installers should leave adequate airflow beneath the array and check tile roofs carefully for brittle or damaged material before mounting.

APS and SRP customers can face different export credits and time-of-use schedules. Confirm the exact utility territory and current rate plan before choosing array size or deciding whether a battery improves the economics.

At the state level, Arizona currently uses net billing (export at lower than retail). A typical interconnection takes 3–7 weeks, but utility review and local permitting can extend that range. Check current rules before relying on a proposal's export-credit or installation-date assumptions.

What should I verify before signing a solar contract in Phoenix?

Confirm that the quote names your actual utility, uses a recent electricity rate, includes measured shade and roof-condition findings, and explains who handles permits and interconnection. Ask the installer to separate guaranteed equipment and workmanship terms from estimated production, incentives, and savings.

Illustrative 8 kW system in Phoenix

Annual production

15,053 kWh

Retail-value ceiling

$2,032

System cost (est.)

$21,200

Energy-only cost/value ratio

~10 yrs

Illustrative 6 peak sun hours, 14.08% production losses, 13.5 cents/kWh and $2.65/W. The retail-value ceiling assumes every kWh earns retail value; lower export credits reduce it. The cost/value ratio is not a full payback model and excludes repairs, financing and rate changes. No new Section 25D homeowner credit in 2026.