Solar Panel Electrical Hazards
Construction · Ver en español
Talking points
- Solar panels generate electricity whenever they are exposed to light — they cannot be fully de-energized during daylight hours. Even on a cloudy day, panels produce hazardous voltage.
- DC voltage from solar arrays can exceed 600 volts. DC shocks are more dangerous than equivalent AC shocks because the constant current causes sustained muscle contraction, making it harder to let go.
- When working on or near solar panels, cover them with opaque material to reduce output. Even covered, residual voltage may be present — test before touching.
- Rapid shutdown systems are now required by code on most new installations, but older systems may not have them. Know the system design before performing any rooftop work near panels.
- Arc faults in DC systems can sustain for much longer than AC arcs because there is no zero-crossing to extinguish the arc. This makes DC arc faults a significant fire risk.
Ask the crew
Are there solar panels on this building — and has anyone briefed the crew on the electrical hazards before going on the roof?
Standards this talk is built on
A toolbox talk is a short safety briefing. It supports the training a standard requires; it does not replace it.
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