Do solar panels work with full moonlight?

Recurring internet question: do my panels produce in moonlight? Short answer: yes, microscopically. Long answer is interesting.

How much light the moon gives

Full moon at zenith (best case): 0.3 lux at ground. Compared to full sun: 100,000 lux. So moon gives 0.0003% of sun. Essentially nothing.

Real estimated production

410 W panel in full sun: 410 W. In full moonlight: ~0.5-1.5 W. To power a 5 W LED bulb needs 5 panels. Whole moonlit night (8 hours): 4-12 Wh per panel. Charging a phone: 2 nights.

The MPPT problem

Even if the panel produces something, the MPPT doesn't start with voltages <80 V typical. Moonlight doesn't lift voltage enough. In practice, all inverters and controllers shut off automatically all night.

Do they produce with city light?

Streetlights, nearby building lights: 10-100 lux. More than the moon but still negligible. The panel detects voltage (measures light as a sensor) but generates no useful power. Technical curiosity, not practical.

The fun experiment

Want to test it: panel + precision digital multimeter. Measure no-load voltage during full moon. You'll see 5-15 V instead of 30-40 V daytime. The cell is reacting, but current is 1000× less.

The future: 'night' panels

Stanford University (2022) demonstrated thermal cell harvesting Earth's infrared radiation escaping to night sky. Generates 50 mW/sqm. Very early tech, not commercial. But opens door to small real nighttime production.

Also read Do solar panels work at night?.