Definition
Bypass diode activation is the conduction of a PV module bypass diode when a cell group is partially shaded. Current routes around the shaded cells, preventing hot-spot damage but creating a step in the I-V curve and reducing module Pmax.
Key Takeaways
- Bypass diode activation: shading triggers diode conduction.
- Protects cells from hot spots.
- Creates I-V curve step; multiple local MPPs possible.
- Module Pmax drops 33–67% during activation.
- MLPE mitigates impact at the string level.
Frequently Asked Questions
2 commonly searched questions about Bypass Diode Activation.
When does a bypass diode activate?
When a cell group in series is partially shaded such that its reverse voltage exceeds the forward voltage of the bypass diode (~0.5 V).
Effect on yield?
Module Pmax drops proportionally to the bypassed cell group fraction. 1-of-3 diode activated = 33% module power loss.
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