Solar Calculators for San Antonio, Texas

Free tools with illustrative San Antonio 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 5.6 sun hours and 12.0 cents/kWh below are planning assumptions, not verified current rates for San Antonio. Confirm CPS Energy eligibility and export settlement.

Notes updated 2026-07-26

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

Peak sun hours

5.6

hrs/day planning assumption

Illustrative energy rate

12.0¢

per kWh (CPS Energy)

Typical install cost

$2.6/W

planning assumption, not a market median

Net metering policy: Avoided-cost credit only

What San Antonio homeowners should check

San Antonio combines strong sunshine with heat, hail, and intense storms. Roof age, ventilation, impact resistance, and realistic summer production assumptions should be documented in the quote.

CPS Energy is the municipal utility for much of the city and sets its own interconnection and compensation rules. Verify current program terms before using older rebate or export-rate figures.

At the state level, Texas currently uses no statewide net metering law. A typical interconnection takes 2–8 weeks depending on utility, 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 San Antonio?

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 San Antonio

Annual production

14,050 kWh

Retail-value ceiling

$1,686

System cost (est.)

$20,800

Energy-only cost/value ratio

~12 yrs

Illustrative 5.6 peak sun hours, 14.08% production losses, 12.0 cents/kWh and $2.6/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.