medium severity

Low PV Voltage

PV input voltage is below normal range, reducing or stopping solar generation.

Research-based reference only

This troubleshooting content is based on general research and common solar-system behavior. It is not a substitute for a licensed electrician, solar installer, manufacturer support, or site inspection. If work involves live AC/DC wiring, batteries, breakers, or inverter internals, stop and call a qualified professional.

Use these steps to understand possible causes before contacting support. Do not open equipment covers or touch energized terminals unless you are trained and authorized.

Possible Causes

Panel shading from trees, buildings, or new construction
Dirty or damaged panels
Failed panel or diode in string
Loose MC4 connector
Early morning/late evening (normal low voltage)

Diagnostic Steps

Check PV voltage at solar noon (peak should be 200V+ for home systems)
Walk roof line and check for new shadows
Inspect panels for visible damage, cracks, or hotspots
Wiggle-test MC4 connectors (power off first)
Compare string voltage vs individual panel expectations

Low PV Voltage

Possible Causes

Diagnostic Steps

Recommended Solutions

Low PV Voltage

Possible Causes

Diagnostic Steps

Recommended Solutions