All Solar Calculators

Free tools for solar panel sizing, tilt, voltage, wiring and cost.

This directory shows only calculators whose interface, formula, worked example, sources and limitations have been reviewed together. Unreviewed topics and translations are not published or included in the sitemap.

• RV Solar Calculator
  Estimate RV panel wattage, battery Ah, controller current, and inverter capacity from explicit energy, reserve, sun, and load inputs.
• Hybrid Solar System Calculator
  Size a grid-tied hybrid solar system: PV array kW, battery kWh, hybrid inverter capacity, and annual self-consumption. Free calculator with US defaults.
• How Many Solar Panels Do I Need?
  Find how many solar panels you need from your monthly kWh, site solar resource, panel wattage, and an explicit performance factor.
• Off-Grid Solar System Calculator
  Size your off-grid solar system in seconds. Calculate PV array kW, battery kWh, and inverter capacity from daily load with NREL peak-sun data.
• EV Charging Cost Calculator (United States)
  Calculate wall energy, charge time, and per-session EV charging cost from battery size, state of charge, charger power, tariff, losses, and solar share.
• Solar Generator Sizing Calculator
  Estimate portable power-station battery Wh, inverter W, and solar input W from load, runtime, autonomy, losses, surge, and peak sun hours.
• Solar Pool Heating Calculator
  Compare selected collector area, representative-day heat demand and solar fraction, plus an explicitly simplified annual bill and payback scenario.
• Solar Panel Tilt Calculator
  Calculate a latitude-based fixed-panel tilt rule of thumb for year-round, summer, or winter scenarios, with formulas and limitations.
• Solar Panel Output Calculator
  Estimate daily, monthly, annual, and forward 25-year solar output from explicit array, resource, performance, age, and rate assumptions.
• Solar Inverter Size Calculator
  Convert PV array DC kW and a chosen DC/AC ratio into inverter AC kW, with a transparent heuristic clipping estimate and design limitations.
• Microinverter vs String Inverter Calculator
  Compare editable inverter-side cost and simplified shade-value scenarios for microinverters and string inverters, with exact formulas and limitations.
• Cost of Solar Panels Calculator
  Estimate U.S. residential solar size and installed cost from electricity use, sun hours, quote price, and a separately verified incentive.