Tools for solar panels

Optimal panel tilt by city

Type a city, we’ll fetch its coordinates and plot the optimal tilt angle (in degrees) at solar noon for each day of the year. Includes markers for solstices and equinoxes.

Optimal tilt (°) Solstices Equinoxes

Hover the chart to see the exact date and angle.

📍Place: —

🧭Coordinates: —

Summer solstice

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Winter solstice

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Spring equinox

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Fall equinox

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Note: The chart computes the tilt that makes the panel perpendicular to the Sun at solar noon throughout the year using the daily solar declination (Cooper’s formula): β = |latitude − declination|. The panel tilts toward N or S as appropriate. Values are limited to 0–90°.

PV Values

Visual arrangement of panels and wiring according to the selected connection.

Power (W)

Open Circuit Voltage (V)

Short Circuit Current(A)

PV Quantity

Connection

Series Parallel

Totals

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Panel Shadows

We compute the minimum row-to-row spacing to avoid shading behind the front row at noon on the worst day.

📍Location: — · —

Panel length L (m)

Panel tilt β (°)

Worst day at noon

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Model: we use the noon solar elevation on the worst day automatically. Provide panel length L and tilt β. We compute height H = L·sin(β), then spacing D = H/tan(α_worst).