Without RSD, solar panels continue to produce high DC voltage whenever the sun is shining, even if the main AC breaker is off.
Module-level electronics reduce voltage at the panel level to a safe level (typically below 1V per module) within seconds.
This ensures firefighters can safely enter a building, spray water, or cut through the roof without risk of electrocution.
DC arcs (caused by damaged cables, connectors, or poor installation) are a common source of solar-related fires.
Optimizers constantly monitor current and voltage at each panel. If abnormal behaviour (indicative of an arc or fault) is detected, the system shuts down power at the source, reducing the chance of a fire starting.
Many countries (including the U.S. under NEC 2017/2020 code) require module-level rapid shutdown for rooftop solar.
Our Solutions are fully compliant and provides built-in RSD functionality, avoiding the need for extra add-on devices.
Knowing that solar panels won’t keep live DC power running across the roof in an emergency reduces liability and risk.
Insurance providers often look favourably on systems with RSD because it lowers fire risk.
SolarEdge’s system provides module-level monitoring.
This means if a connector starts overheating or a cable is damaged, the system can detect it early and prevent escalation into fire.
Arc detection: Monitors for abnormal current/voltage patterns that indicate sparking or arcing.
Shutoff at module level: Limits voltage so that even if a cable is damaged, there isn’t enough energy to sustain a fire.
Safe maintenance: Technicians can work on the system without risk of live DC electricity causing burns, sparks, or fires.
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