Free professional-grade calculators for system sizing, financial analysis, engineering, and incentive planning.
Determine the optimal solar system size based on your energy usage and location.
→ Res + CommEstimate annual and monthly energy production for any system size.
→ ResidentialCalculate how much of your electric bill solar will eliminate.
→Estimate system size, production, and cost for roof-mounted installations.
→ CommercialSize ground-mounted arrays including racking and land requirements.
→ CommercialDesign solar carport systems with EV charging and parking coverage.
→Determine the right battery capacity for your critical loads.
→ ResidentialCalculate how long your battery will power your home.
→ Res + CommIdentify and total your essential circuits for backup sizing.
→ Res + CommCalculate electrical load impact of adding EV chargers.
→ Res + CommOptimize solar and battery sizing together.
→Full 25-year financial model with ROI, payback, and NPV.
→ CommercialLevelized Cost of Energy vs. grid electricity.
→ Res + CommMonthly payments, total interest, and net cost analysis.
→ Commercial5-year accelerated depreciation with ITC basis reduction.
→ ResidentialCompare lease payments to utility bills and savings.
→ Res + CommModel Power Purchase Agreement economics.
→ Res + CommCompare cash, loan, lease, PPA, and C-PACE side by side.
→ CommercialMap ITC, MACRS, SREC, and REAP deadlines.
→Optimal string length based on module specs and temperature.
→ EngineeringOptimize DC-to-AC ratio for energy harvest vs. clipping.
→ EngineeringCalculate voltage drop and verify NEC compliance.
→ EngineeringSelect wire gauge based on ampacity and distance.
→ EngineeringVerify NEC conduit fill compliance for solar circuits.
→ EngineeringEstimate panel count with setbacks and spacing.
→Microinverters, IQ Battery, EV charging, and backup loads.
→ Res + CommOptimizer + string design with battery and EV charging.
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