Yes, solar panels can still generate electricity when partially shaded, but with significantly reduced efficiency. Modern panels use bypass diodes to allow current to flow around shaded cells, preventing complete shutdown. However, even partial shading can cause disproportionate energy losses due to series-connected cells acting as “weakest links” in the electrical chain.
Key considerations:
- Bypass diodes (present in most modern panels) minimize losses by isolating shaded cell groups, typically reducing output by only the shaded portion rather than the entire panel.
- System design impacts:
- String inverter systems suffer most, as shade on one panel can reduce output for the entire connected string.
- MLPEs (microinverters/power optimizers) enable panel-level optimization, allowing unshaded panels to operate at full capacity.
- Technology solutions:
- Half-cell panels reduce resistance and improve shade tolerance by splitting cells into independent sections.
- Bifacial panels capture reflected light to partially compensate for front-side shading.
- Design strategies:
- Shading analysis tools identify optimal panel placement to minimize obstructions.
- Multiple MPPT inverters allow different array sections to operate independently.
While partial shading doesn’t eliminate production, it often requires mitigation strategies to maintain viable output levels. Homeowners with shade concerns should prioritize systems using microinverters or power optimizers.
Original article by NenPower, If reposted, please credit the source: https://nenpower.com/blog/can-solar-panels-still-generate-electricity-if-they-are-partially-shaded/
