How to apply reverse tilt to solar panels in OpenSolar

Summary:

This article explains how to use the Reverse Tilt feature in OpenSolar to optimize solar panel placement on roofs with less-than-ideal orientations. You'll learn how to apply negative tilt angles, adjust panel spacing to reduce shading, and maximize solar exposure.

Table of contents:

Adding tilt to the solar panel

Optimize Spacing to Avoid Shading

FAQs

Adding Tilt to the Solar Panel:

To begin placing panels with a tilt:

• In Design Mode, select the “+ Panel” tool.

• Draw your desired panel layout on the roof surface.

• Click on the panel group to access its settings.

Configure Tilt:

• In the Basic Settings panel:

  • Set the Racking Type to Single Tilt.

  • To apply a reverse tilt, enter a negative tilt angle.

Example:
If the roof pitch is +19.4°, entering -19.4° will flatten the panels to match the roof surface.
To tilt the panels in the opposite direction (i.e., reverse tilt), increase the negative value (e.g., -44°).

 

 Reverse tilt is particularly useful on east- or west-facing roofs or when sunlight comes from an unconventional direction.

Optimize Spacing to Avoid Shading:

Reverse tilting increases the risk of inter-row shading. To optimize spacing:

• Select the panel group you want to adjust.

• Go to the Advanced Settings section.

• Locate the Row Spacing field.

• Increase the spacing value based on:

  • Tilt angle

  • Panel height

  • Roof size and orientation

Proper row spacing ensures that each panel receives maximum sunlight throughout the day and prevents shading from adjacent rows.

FAQs

1. Can reverse tilt be applied to all panel types?
Yes, reverse tilt can be applied to all solar modules in OpenSolar, regardless of type or manufacturer.

2. Does reverse tilt impact system efficiency?
Yes, positively — in many cases. Reverse tilt helps optimize panel orientation on suboptimal roof slopes. However, if inter-row shading isn't properly managed, it may reduce performance. Always evaluate shade losses using OpenSolar's simulation tools.

3. Can I use reverse tilt on flat roofs?
Absolutely. Reverse tilt is effective on flat roofs where you want to direct panels toward a specific azimuth for better sun exposure.

4. Is there a maximum tilt angle for reverse tilt?
There is no fixed maximum, but practical and structural constraints should be considered:

• Avoid overly steep reverse angles that might cause instability or excessive wind loading.

• Comply with local engineering and building codes.