Free Tools
Solar Calculators & Tools
38 free calculators and tools for solar professionals. System sizing, financial analysis, electrical design, and more - no signup required.
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System Sizing
6 toolsSolar Calculator
Estimate solar system output for any location
Use ToolSolar Panel Sizer
Calculate the right number of panels for any load
Use ToolSystem Size Calculator
Determine optimal system size based on consumption
Use ToolSolar Power Calculator
Estimate power output from solar panel specifications
Use ToolPanel Layout Estimator
Estimate panel count based on available roof area
Use ToolAC Size Calculator
Calculate the right AC system size for your needs
Use ToolFinancial & Savings
8 toolsROI & Payback Calculator
Calculate return on investment and payback period
Use ToolPayback Period Calculator
Estimate time to recoup your solar investment
Use ToolSolar LCOE Calculator
Calculate discounted lifetime energy cost per kWh
Use ToolSolar Savings Calculator
Estimate lifetime savings from going solar
Use ToolSolar Loan Calculator
Calculate monthly payments and total interest
Use ToolLease vs Buy vs PPA
Compare financing options side by side
Use ToolMACRS Depreciation Calculator
Calculate accelerated depreciation tax benefits
Use ToolElectricity Bill Calculator
Estimate monthly electricity costs and savings
Use ToolNet Metering & Incentives
4 toolsNet Metering Savings
Calculate savings from net metering programs
Use ToolNEM Version Comparison
Compare NEM 1.0 vs 2.0 vs 3.0 rates
Use ToolSolar Incentive & Rebate Finder
Review incentive sources and eligibility by state
Use ToolUtility Rate Escalation Projector
Project future electricity rate increases
Use ToolElectrical Design
6 toolsString Sizing Calculator
Calculate optimal string configuration for inverters
Use ToolWire Size Calculator
Determine the correct wire gauge for your system
Use ToolVoltage Drop Calculator
Calculate voltage drop across wire runs
Use ToolConduit Fill Calculator
Check NEC conduit fill compliance
Use ToolBusbar Size Calculator
Determine busbar sizing for current capacity
Use ToolInverter Load Calculator
Calculate total load and inverter capacity needed
Use ToolSite & Environmental
5 toolsIrradiance Estimator
Estimate solar irradiance for any location
Use ToolSun Angle Calculator
Calculate sun azimuth and elevation for any date
Use ToolRoof Pitch Calculator
Calculate roof angle from rise and run
Use ToolShading Analysis Tool
Analyze shade impact on solar performance
Use ToolCO2 Savings Calculator
Calculate carbon emissions offset by solar
Use ToolPower & Load
5 toolsWattage Calculator
Calculate watts from amps and volts
Use ToolPower Supply Calculator
Calculate total power supply requirements
Use ToolPC Power Supply Calculator
Size the right PSU for computer systems
Use ToolUPS Calculator
Size UPS for backup power requirements
Use ToolHVAC Calculator
Calculate heating and cooling load in BTU
Use ToolProposals & Permitting
2 toolsNeed More Than a Calculator?
SurgePV combines all these calculations into one integrated platform - design, simulate, and generate proposals without switching between tools.
Confirm current evaluation access and plan terms with the SurgePV team.
Need a workflow map? See how the professional design calculators fit together.
