Solar Panel Sizer PV kW

Solar Panel Sizer — PV System Sizing by Peak Sun Hours

# What it does

Calculates the number of panels, system size in kW, annual & monthly production, and roof area requirements for residential and commercial photovoltaic systems.

# Features

- Daily energy consumption (kWh) input

- Peak sun hours by location

- 7 panel presets: mono 250-500 W and bifacial 600 W

- Grid-tied, off-grid, hybrid system types

- System loss factor (10%-25%)

- Roof area sufficiency check (sq ft)

- Annual & monthly kWh production estimate

- Peak-sun-hours method with NREL TMY-derived state data

# Made for

Solar installers, PV system designers, electrical contractors, EPC engineers, NABCEP exam candidates.

# Optional Pro Upgrade — $2.99 one-time

The following features require a separate one-time in-app purchase. They are not required to use the calculator:

- Calculation history (saved & searchable)

- PDF report export with NEC references

- Dark theme

- Ad-free experience