Do Solar Panels Work on Cloudy and Rainy Days in Singapore?

Singapore's Solar Resource

Annual GHI of ~1,580 kWh/m² — higher than London (~1,000) and Frankfurt (~1,100). Monsoon months (Nov–Jan, May–Jul) reduce peak sun hours to 3.5–4.0 vs 4.5–5.0 in sunnier months. Monthly variation: ~15–20%.

Rain and Lightning

Rain partially cleans panels but also deposits organic matter. Rezeca recommends cleaning every 6 months. Singapore averages 168 lightning days/year — all Rezeca installations include surge protection and proper earthing.