Bypass diodes are semiconductor devices used in photovoltaic junction boxes to prevent reverse current flow and protect solar cells from hot-spot heating during partial shading or mismatch conditions.
| Parameter | Typical range | Notes & selection driver |
|---|---|---|
| Response Time | <100ns | |
| Thermal Resistance | 1-5°C/W | |
| Forward Voltage Drop | 0.3-0.7V | |
| Operating Temperature | -40°C to +150°C | |
| Forward Current Rating | 10-20A | |
| Reverse Voltage Rating | 45-60V |
Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.
This component is used in the following industrial products
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A failed bypass diode (typically open-circuit failure) eliminates protection for its associated solar cell string. This can lead to hot-spot heating in shaded cells, reduced power output, and potential permanent damage to solar cells due to excessive reverse voltage stress.
Most standard 60-cell solar panels contain 3 bypass diodes, each protecting a substring of 20 cells. 72-cell panels typically have 3 or 4 diodes. The configuration depends on the panel design and voltage requirements.
Yes, bypass diodes can be replaced if the junction box is accessible and designed for maintenance. However, replacement requires specialized equipment and should be performed by qualified technicians to maintain weatherproof integrity and electrical safety.
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