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Solar panel angles in Democratic Republic of the Congo

Optimal fixed-panel tilt and orientation for 5 cities in Democratic Republic of the Congo, computed from solar geometry.

CityLatitudeOptimal tiltFacingFlat roof keeps
Kinshasa 4.33°S north 100%
Lubumbashi 11.66°S 11° north 98%
Mbuji-Mayi 6.14°S north 100%
Kananga 5.90°S north 100%
Kisangani 0.52°N south 100%

How these angles are calculated