The performance of solar panel systems largely depends on access to sunlight. Shading – whether partial or full – can significantly affect the efficiency of solar panels and the amount of energy produced.
The effect of shading on solar panels
Performance reduction: In the case of shading, the current production of the affected solar cells can decrease significantly, and can reduce the system's efficiency by as much as 30-40%.
Partial shading: Partial shading – for example, due to a tree branch or a chimney's shadow – can affect the entire solar panel array, as the cells are connected in series.
Hot Spot phenomenon: Shaded cells can act as resistors, generating heat. This can damage solar panels in the long run if there is no adequate protection, such as bypass diodes.
Addressing shading problems
Optimized placement: Before installing solar panels, it is important to examine the shading conditions of the roof or installation site, especially considering winter and summer sun positions.
Orientation and tilt angle modification: The orientation (south direction is most optimal in Hungary) and tilt angle of solar panels can maximize sunlight capture and minimize the effect of shading.
Alternative installation solutions:
- Ground-mounted systems: If the roof is shaded, it may be worth placing the solar panels on a ground-mounted system, where an optimal position can be more easily ensured.
- Utilizing sunny areas: It is advisable to choose locations that provide the maximum possible sunlight, such as the south side of a roof or an open area.
Shading-resistant technologies:
- Bypass diodes: These redirect the circuits around shaded cells, minimizing power loss.
- Optimizers and microinverters: These devices allow each solar panel to operate independently, reducing the effect of shading on the entire system.
Summary
Minimizing shading is one of the most important steps in the design and operation of solar panel systems. Optimized placement, the use of anti-shading technologies, and careful preliminary planning guarantee that the system achieves maximum performance.