Solar Production

Solar Production - professional NEC calculator for electricians. Offline, permit-ready.

Solar Production Estimator helps solar energy professionals estimate annual and monthly energy production for PV systems across all 50 US states and DC.

FEATURES:

• Annual and monthly production estimates using NREL TMY3 irradiance data
• All 50 US states plus District of Columbia
• Tilt and azimuth angle correction for non-optimal orientations
• System loss factor (wiring, inverter, soiling, shading)
• Panel degradation modeling over system lifetime
• Specific yield (kWh/kWp/year) calculation
• Performance ratio and capacity factor metrics
• Daily average production output

CALCULATIONS:

• Annual Production = System Size x Irradiance x (1 - Losses) x Degradation Factor
• Monthly breakdown with state-specific solar resource data
• Tilt/azimuth correction based on deviation from optimal
• Degradation Factor = (1 - rate)^age for aging systems

OPTIONAL PRO UPGRADE - $2.99 ONE-TIME IN-APP PURCHASE The following features require a separate one-time in-app purchase. They are not required to use the calculator:

• Unlimited saved calculation history
• PDF export of results
• Dark theme
• Ad-free experience

UPGRADE TO PRO:

• Remove banner ads
• Unlimited calculations
• Dark theme support

Designed for solar installers, engineers, and PV system designers working in the United States.