Flexible Roller Brush Hardness Options for BQ series & AQ series - Knowledge

One Robot, Multiple Cleaning Scenarios

When it comes to photovoltaic cleaning, brush selection matters as much as the robot itself. Different solar plants face very different pollution conditions-fine dust, sand, bird droppings, industrial residue, or long-term hardened dirt.

That's why both BQ series & AQ series are designed with a flexible roller brush system, allowing users to freely choose the brush hardness based on real on-site conditions.

Five Levels of Roller Brush Hardness

Adapted to different pollution levels

Our roller brushes are available in five hardness grades, giving operators the freedom to balance cleaning efficiency and panel protection:

1. Soft brush

Suitable for lightly soiled panels, frequent maintenance cleaning, or newly installed PV plants.

2. Standard brush (most commonly used)

The default and most popular choice.
Ideal for over 80% of regular photovoltaic power stations, offering excellent cleaning performance while remaining safe for module surfaces.

3. Medium-hard brush

Designed for environments with more dust accumulation, mild sand, or sticky contaminants.

4. Hard brush

Used in desert, mining, or industrial areas where dirt is heavier and harder to remove.

5. Extra-hard brush

For extreme pollution scenarios or long-term uncleaned modules where stubborn deposits require stronger mechanical action.

Why Most Customers Choose #2 Standard Brush

In real-world operation, the #2 standard roller brush provides the best overall balance:

• Strong enough to remove common dust and bird droppings

• Gentle enough to protect glass surfaces and anti-reflective coatings

• Suitable for routine, scheduled cleaning

• Lower wear rate, longer service life

For this reason, #2 is our recommended default configuration for most projects.

Hard & Extra-Hard Brushes for Special Conditions

In some regions, standard cleaning is simply not enough.
For example:

• Desert PV plants with heavy sand and wind-blown particles

• Industrial zones with oily or sticky residues

• Panels that have not been cleaned for long periods

In these cases, hard or extra-hard roller brushes can significantly improve cleaning results, especially when combined with water-based cleaning on the BQ series & AQ series platforms.

Designed for Choice, Built for Protection

The key advantage of the BQ series & AQ series is not just cleaning power, but adaptability.
Instead of forcing customers to use a single brush solution, we let operators choose the right tool for their environment, reducing unnecessary wear on panels while maximizing cleaning efficiency.

Whether your site requires gentle daily maintenance or aggressive deep cleaning, the brush hardness can be matched to the task-not the other way around.