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Solar Panel Angle: how to calculate solar panel tilt angle?

Discover how to calculate the optimal solar panel angle for your solar system according to your location and the season. Two calculation methods explained.

How to calculate the Solar Panel Angle of your solar system?

The solar panel angle of your solar system is different depending on which part of the world you are.

Solar panels give the highest energy output when they are directly facing the sun.

The sun moves across the sky and will be low or high depending on the time of the day and the season. For that reason the ideal angle is never fixed.

To get the most sun reaching the panel throughout the day, you need to determine what direction the panels should face and calculate an optimal tilt angle. This will depend on:

  • Where you live
  • What time of the year you need the most solar energy
solar panel angle

Solar panel angle

Calculating the Optimal solar panel Angle

As a rule of thumb, solar panels should be more vertical during winter to gain most of the low winter sun, and more tilted during summer to maximize the output.

Here two simple methods for calculating approximate solar panel angle according to your latitude.

Calculation method one

The optimum tilt angle is calculated by adding 15 degrees to your latitude during winter, and subtracting 15 degrees from your latitude during summer.

For instance, if your latitude is 34°, the optimum tilt angle for your solar panels during winter will be 34 + 15 = 49°.

The summer optimum tilt angle on the other hand will be 34 – 15 = 19°.

Calculation method two

This is an improvement of the general method that gives better results. In this method, the optimum tilt angle for solar panels during winter is calculated by multiplying the latitude by 0.9 and then adding 29°. In the above case example of a latitude of 34°, the tilt angle will be (34 * 0.9) + 29 = 59.6°.

This angle is 10° steeper than in the general method but very effective at tapping the midday sun which is the hottest in the short winter days.

For summer, the tilt angle is calculated by multiplying the latitude by 0.9 and subtracting 23.5°. In the above case example, this angle would be (34 * 0.9) – 23.5 = 7.1°.

For optimum tilt angles during spring and fall, 2.5° is subtracted from the latitude.

    Comment Section

    5 thoughts on “Solar Panel Angle: how to calculate solar panel tilt angle?

    By Harilal Bhatti on 24 May 2016

    Very Easy to Understand

    By Maxim on 14 December 2016

    What exactly period is identifited as winter and summer? From which to which month

    By ramkripal on 30 December 2016

    i m confused sir
    my location latitude is 21.24

    so my tilt angle is in winter

    1st method
    21.24+15= 36.24

    n 2nd method
    (21.24×0.9)+29 = 48.116
    witch is right method???

    By Vietky on 5 March 2017

    Annual 0.76*latitute+3,1
    Winter 0.89*latitute+24
    Summer 0.92*latitute-24.3
    Others 0.98*latitute-2,3

    By opeyemi gbogi on 3 April 2017

    please my latitude is 8.136
    using the methods it gives me 36.3224 and -16.1776
    is this correct

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