Arizona solar guide
DIY solar in Arizona: incentives, sizing, and the off-grid angle
Arizona is the easiest DIY solar state in America. The sun is relentless, the state credit is real ($1,000 cap), equipment ships sales-tax-free, and property tax doesn't increase when you add PV. The federal 26% credit stacks on top.
The catch: APS and SRP both moved to avoided-cost export compensation years ago — meaning you get $0.07–$0.10/kWh for exports instead of the $0.13–$0.18/kWh retail rate. For grid-tied systems, this tilts the math hard toward self-consumption (use what you make in real-time) and toward batteries for storing midday surplus.
Incentive snapshot
As of mid-2026. Verify on your state's energy website before relying on the dollar figures.
- Federal Residential Clean Energy Credit
- 26%
- State tax credit
- up to $1,000
- Sales tax exemption on solar equipment
- Yes
- Property tax exemption
- Yes
- Net metering
- Avoided-cost only
- SREC market
- None
- Average peak sun hours
- 6.4 hrs/day
- DIY-permit friendly
- Yes
Phases down: 30% through 2025 → 26% in 2026 → 22% in 2027 → 0% under current law. Dwellings only — vehicle/RV systems don't qualify.
Arizona Residential Solar and Wind Energy Systems Credit — 25% of cost, capped at $1,000.
Your panels, batteries, and controllers ship sales-tax-free.
Adding solar doesn't bump your assessed value.
APS and SRP pay roughly $0.07–$0.10/kWh export rate (well below retail) under their Self-Consumption plans.
No SREC revenue available in this state.
Used to size your array — more sun hours = fewer panels needed for the same output.
Most jurisdictions allow homeowner permits for own-occupancy installs.
DIY install angle in Arizona
Maricopa, Pima, and Pinal counties all allow homeowner electrical permits for own-occupancy installs. The permit fee is typically $100–$300 and inspections are routine. No licensed electrician required for off-grid systems.
Roof-mounted arrays in Arizona need extra structural consideration for monsoon-season wind loads (60+ mph gusts are common in July/August). Standoff mounts with proper flashing — pay for the good UniRac or IronRidge hardware. The cheap import racking systems don't survive AZ monsoons.
Ground-mount arrays are popular on AZ rural lots and don't need any roof penetration — easier permitting and less heat. Just need adequate foundation depth for caliche soil.
Sizing for Arizona sun
Arizona averages 6.4 peak sun hours/day statewide — the best in the Lower 48. Phoenix and Tucson regularly hit 7+ in June. This means smaller arrays produce more power than equivalent setups in any other state.
The AZ heat tradeoff: panel output drops about 0.4% per °C above 25°C. On a 115°F day, your "100W" panel actually puts out about 80W due to thermal derating. Plan for 20% real-world derating in your summer-month sizing math.
Battery chemistry in extreme heat: LFP is the only chemistry that handles enclosed-space Arizona summers without dramatically shortened life. AGM degrades fast. NMC is a fire risk in poorly ventilated installs. Use LFP, vent your battery enclosure, and ideally keep it shaded.
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Enter your panels, battery bank, and load profile. We run the wiring math (NEC 690.7 cold- weather Voc derating, 690.8 ampacity) and recommend charge controllers that actually work together — ranked by price-to-trust, not by who paid us.
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