Solar Panel ROI, Payback & Sizing Calculator (kWp & Panels) | OmniCalc Pro

Calculate how many solar panels and inverter kW you need, monthly bill savings, payback period, and 25-year solar ROI.

Complete Solar Photovoltaic Sizing & ROI Analysis

Use this engineering calculator to determine the exact kilowatt-peak (kWp) capacity, number of 550W monocrystalline panels, and string inverter rating required to offset your monthly utility bill.