How solar panels on a van pumped out 120% of their rated power in one day

A van-mounted 880-watt solar setup briefly hit 1,050 watts, or about 120% of its nameplate rating.

The panels were two 440-watt bifacial modules on an XLWB Sprinter van.

Commenters and prior research pointed to cloud-edge enhancement, extra sky exposure, and cool post-rain conditions.

The spike appears to be a real-world weather and mounting effect, not a malfunction or a physics-breaking event.