Solar eclipse and PV panels: what happens to production

A solar eclipse is 'moon covering sun partially or fully'. For your solar panel it's basically sudden nightfall at noon. USA had total eclipse April 2024; next continental total: August 2044.

What happens exactly

70% partial eclipse: incoming sunlight is 30% normal. Your panel produces ~30% of peak. Total eclipse: for 1-4 minutes, basically 0%. Drop is steep: in 30 minutes you go from 100% to 30%.

Grid impact

Country with lots of solar (USA hitting 6% nationally, California 25% at noon), grid operator must compensate with gas or combined-cycle in minutes. April 2024 eclipse caused sudden 9 GW solar loss across central USA.

What to do at your house

Nothing special. Your system handles transition automatically. With battery: discharges during the event. Without: grid compensates. Just curiosity: production chart will show the eclipse bite.

Future US eclipses

Next continental total: August 23, 2044 and March 26, 2045. Partial eclipses more frequent: 2 per year somewhere. Hawaii had annular January 2024.

Future European eclipses

August 12, 2026: 90% partial in northern Spain, total in Iceland. August 2, 2027: total visible across Spain. January 26, 2028: annular in southern Spain. Three events in 2 years, rare opportunity.

The grid operator's test

Grid operators use eclipses as 'drills' for extreme cloud-cover scenarios. They prove the grid handles massive solar drops as long as gas/hydro backup exists. Without massive batteries, backup dependency continues.

Compare with production lower than expected.