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Solar

Browse 19 solar tools. Opening Solar Payback Period (ROI) Calculator.

  • Solar Panel SizeEstimate minimum panel wattage from daily energy use and sun hours.Use this to buy the right panel size the first time instead of guessing.
  • Solar Daily YieldEstimate daily energy output from panel wattage and sun hours.Use this to know how much energy your panels will produce on a typical day.
  • Solar Battery Bank SizeSize an off-grid battery bank from daily use and backup days.Use this to size a battery bank that carries you through cloudy days.
  • Solar Charge Controller Size CalculatorEstimate minimum charge controller amperage from panel watts and system voltage.Use this to pick a charge controller that safely handles your panel output.
  • Solar Inverter Efficiency CalculatorCalculate inverter efficiency from AC output and DC input power.Use this to check how much solar power actually reaches your appliances.
  • Solar Array Current CalculatorEstimate array current from total panel watts and system voltage.Use this to size your wiring and fuses safely for your solar array.
  • Solar Panel Tilt CalculatorRecommended panel tilt angle based on your latitude (year-round estimate).Use this to angle your panels for the most energy at your location.
  • Solar Panel Roof Space CalculatorEstimate how many panels fit on your roof and total system size in kW—updates live.Use this to know how big a system your roof can hold before getting quotes.
  • Solar Payback Period (ROI) CalculatorEstimate payback time and 25-year savings from system cost, production, and electricity rates.Use this to see when your solar investment starts making you money.
  • Solar Panel Angle & Tilt OptimizerOptimal tilt and azimuth from latitude and season—fixed, summer, or winter mounting.Use this to squeeze more output from your panels with the right tilt each season.
  • Grid-Tie Net Metering CalculatorCompare monthly bills with solar: self-use, export credits, and grid imports.Use this to see how much solar exports will shrink your monthly bill.
  • Solar Panel Degradation CalculatorEstimate remaining annual output and capacity after years of panel degradation.Use this to know how much output an aging system still delivers before buying used.
  • Off-Grid Generator vs. Solar Hybrid CalculatorCompare 5- and 10-year cumulative costs of diesel generator-only power vs. a solar+battery hybrid—and estimate annual savings.Use this to compare long-term costs and pick the cheaper off-grid setup.
  • Generator Run-Time Savings CalculatorEstimate daily engine hours saved with a solar+battery hybrid, maintenance dollars avoided, and longer generator life.Use this to see how solar cuts generator hours, fuel bills, and maintenance.
  • Water Pump Solar Sizing CalculatorSize a solar array for irrigation or well pumps—kWp, panel count, and MPPT guidance from pump watts, run hours, lift, and peak sun.Use this to power your well or irrigation pump on solar without oversizing.
  • DC Cable Size & Voltage Drop CalculatorSize copper DC homeruns from panels to charge controller—minimum mm² / AWG for amp load, length in meters, and max voltage drop.Use this to pick cable sizes that don't waste the solar power you paid for.
  • Solar System Degradation & 20-Year ROI CalculatorModel 20 years of declining PV output, rising electricity rates, cumulative savings, and break-even with annual degradation.Use this to see your true 20-year solar returns before signing a contract.
  • Solar Shading AnalysisEstimate annual kWh and dollar loss from partial shading on string inverters vs module optimizers.Use this to know what that tree shadow costs you and whether optimizers are worth it.
  • Solar ROI AnalysisAdvanced 20-year solar payback with degradation, rate inflation, export credits, incentives, and cumulative savings vs. status quo.Use this to compare solar quotes with a full 20-year financial picture.

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