Free Solar Energy Tools

Determine the optimal solar system size for your home based on energy consumption and roof space.

Calculate battery storage ROI and payback period for your solar system with state-specific net metering policy analysis, time-of-use rate optimization, and Virtual Power Plant (VPP) revenue estimation.

Find out at what price home battery storage makes sense — with or without solar. See payback period, 10-year net savings, break-even battery price, and Virtual Power Plant revenue for your state.

Calculate how much CO2 emissions you can offset by switching to solar energy.

Reveal the true cost of going solar by exposing hidden fees, non-bypassable utility charges, income-graduated fixed charges, minimum bills, and interconnection costs that solar salespeople routinely omit from their quotes.

Compare solar panels side-by-side on efficiency, warranty, degradation, and cost per watt.

Compare solar inverters by type, warranty, price, and reliability. Filter string, microinverter, DC optimizer, and hybrid inverters with community-based reliability ratings.

Analyze your electricity bill to discover usage patterns, identify savings opportunities, and see how much solar panels could save you.

Decode your solar PPA or lease contract. Identify red flags like FMV buyout traps, escalator clauses, hidden dealer fees, and transfer restrictions before you sign.

Enter a solar PPA offer (rate, escalation, term) and compare its true 25-year cost against projected utility rates. See total savings, break-even year, and red-flag warnings for unfavorable terms.

Calculate combined solar panel and EV charging savings — annual and 25-year financial projections, optimal system sizing, and CO₂ reduction with real EPA vehicle data.

Project your solar panel energy output over 25 years accounting for panel degradation. Compare premium, standard, and budget panel tiers with warranty threshold analysis.

Estimate your total DIY solar installation cost including permit fees and interconnection by jurisdiction. See your permit complexity badge by ZIP code, full cost breakdown, and compare DIY vs professional install quotes.

Calculate exactly how many batteries you need for backup power based on your usage and outage duration. Compare LFP, NMC, lead-acid, and Tesla Powerwall options with state incentive-adjusted costs.

Compare heat pump vs gas furnace vs electric resistance heating costs for your home. See annual operating cost, 10-year savings, CO2 reduction, and payback with HEEHRA/HOMES rebates by state — using EIA 2026 energy rates and your climate zone.

Estimate your monthly and annual energy savings when switching to solar power.

Find out how many years it will take for your solar investment to pay for itself.

Get an estimate of total installation costs including equipment, labor, and permits for your area.

Find the average peak sun hours for your location to estimate solar energy production potential.

Properly size your solar inverter to match your panel array for maximum efficiency.

Analyze how your roof's orientation, tilt, and shading affect solar panel performance.