Review

PV systems can be roof-mounted or ground-mounted. Most systems are grid-tied, while some are off-grid or a hybrid of the two.

PV systems generally consist of:

• Arrays
• Inverters
• Conduit
• Combiner boxes
• Batteries
• Meters
• Disconnect switches

Potential risks of PV systems include:

• Access limitations
• Structural failure
• Trip or slip hazards
• Enhanced flame spread
• Shock hazards
• Toxins and carcinogens
• Surges and arcing
• Battery hazards

Always assume components are energized, even if the sun is not shining or if PV panels are damaged. After the system is shut off, inverters still pose a shock hazard until they have completely discharged their stored energy.