EnergyCalcSuiteSolar Energy Calculators
Residential solar economics depend on system cost, local production, utility compensation rules, and financing terms. Use these calculators to test different assumptions for payback, seasonal output, lifetime performance, and system design before requesting proposals.
Evaluate, Design, and Compare Solar Systems
Going solar is a major financial decision, and the economics vary widely depending on system size, local utility rates, net metering policies, and how much energy you actually consume on-site. A system that pencils out in one state may not make sense in another — which is why running the numbers with your own inputs matters more than any rule of thumb.
Start by estimating your 25-year return on investment and payback period to understand the financial timeline. Then use the self-consumption calculator to see how much solar energy you'll use directly versus exporting to the grid — this ratio significantly affects your real savings, especially in areas with low export rates.
For system design, the inverter sizing tool validates your DC:AC ratio against electrical code requirements, while the seasonal production calculator shows how output varies by month based on your latitude. Model 25-year panel degradation to compare installer warranty claims against realistic lifetime output. If you're considering going fully off-grid, the off-grid vs grid-tied comparison breaks down total cost of ownership for both approaches.
Common Tasks
Calculate your solar panel return on investment over 10-30 years with detailed financial analysis
Find out when your solar panels will pay for themselves with break-even analysis
Calculate how much solar energy you use directly vs export to the grid
Calculate the optimal inverter kW rating for your solar array with DC:AC ratio validation and electrical code compliance warnings
Compare monthly solar output by season based on your location latitude with winter/summer production ratio
Model cumulative solar production over 25-30 years with annual degradation and warranty vs real-world comparison
Compare total cost of off-grid vs grid-tied solar systems over 10-25 years including equipment, battery storage, maintenance, and electricity savings
Determine if your solar system can charge your EV based on surplus generation and seasonal variation
Calculate your 0-100 energy independence score based on solar, battery, and grid dependency with US percentile context
All Solar Energy Calculators
Calculate your solar panel return on investment over 10-30 years with detailed financial analysis
Find out when your solar panels will pay for themselves with break-even analysis
Calculate how much solar energy you use directly vs export to the grid
Model cumulative solar production over 25-30 years with annual degradation and warranty vs real-world comparison
Compare monthly solar output by season based on your location latitude with winter/summer production ratio
Calculate the optimal inverter kW rating for your solar array with DC:AC ratio validation and electrical code compliance warnings
Compare total cost of off-grid vs grid-tied solar systems over 10-25 years including equipment, battery storage, maintenance, and electricity savings
Determine if your solar system can charge your EV based on surplus generation and seasonal variation
Calculate your 0-100 energy independence score based on solar, battery, and grid dependency with US percentile context
Solar Energy Guides
Frequently Asked Questions
Continue Your Planning
Size home batteries, estimate backup time, and compare battery vs generator costs for outage protection.
Analyze your electricity bill, estimate appliance costs, and find savings from TOU plans and insulation upgrades.
Compare EV charging costs vs gas, evaluate heat pump savings, and assess solar-powered EV charging feasibility.
Browse all 22 energy calculators across every category.