Peak Sun Hours,
anywhere on Earth.

Largest cities

• Shanghai, Shanghai

  3.7
  China · 24.9M pop · Temperate
• Beijing, Beijing

  4.0
  China · 19.0M pop · Temperate
• Shenzhen, Guangdong

  4.1
  China · 17.5M pop · Tropical
• Guangzhou, Guangdong

  3.8
  China · 16.1M pop · Tropical
• Kinshasa, Kinshasa

  4.5
  Democratic Republic of the Congo · 16.0M pop · Equatorial
• Istanbul, Istanbul

  4.0
  Turkey · 15.7M pop · Temperate
• Lagos, Lagos

  4.6
  Nigeria · 15.4M pop · Equatorial
• Ho Chi Minh City, Ho Chi Minh City (HCMC)

  5.2
  Vietnam · 14.0M pop · Tropical
• Chengdu, Sichuan

  3.1
  China · 13.6M pop · Temperate
• Lahore, Punjab

  4.9
  Pakistan · 13.0M pop · Tropical
• Mumbai, Maharashtra

  5.3
  India · 12.7M pop · Tropical
• São Paulo, São Paulo

  4.5
  Brazil · 12.4M pop · Temperate
• Mexico City, Mexico City

  5.5
  Mexico · 12.3M pop · Temperate
• Karachi, Sindh

  5.6
  Pakistan · 11.6M pop · Tropical
• Tianjin, Tianjin

  4.0
  China · 11.1M pop · Temperate
• Delhi, Delhi

  4.9
  India · 11.0M pop · Tropical
• Wuhan, Hubei

  3.5
  China · 10.4M pop · Temperate
• Moscow, Moscow

  2.9
  Russia · 10.4M pop · Continental
• Dhaka, Dhaka Division

  4.5
  Bangladesh · 10.4M pop · Tropical
• Seoul, Seoul

  3.9
  South Korea · 10.3M pop · Temperate
• Tokyo, Tokyo

  3.9
  Japan · 9.7M pop · Temperate
• Dongguan, Guangdong

  3.8
  China · 9.6M pop · Tropical
• Cairo, Cairo

  5.7
  Egypt · 9.6M pop · Temperate
• Xi’an, Shaanxi

  3.8
  China · 9.6M pop · Temperate

Browse by country

• India
  3,776 cities
• United States
  3,398 cities
• Brazil
  2,345 cities
• China
  2,082 cities
• Japan
  1,296 cities
• Germany
  1,144 cities
• Russia
  1,106 cities
• United Kingdom
  863 cities
• Spain
  735 cities
• France
  691 cities
• Italy
  653 cities
• Mexico
  643 cities

What are Peak Sun Hours?

A Peak Sun Hour (PSH) is one hour of sunlight at 1 kW/m² — roughly midday clear-sky intensity. The PSH value for a location is the equivalent number of peak hours per day, averaged over the year. It's the single most useful number when sizing solar panels and batteries: a 400 W panel in a location with 5.0 PSH produces about 2 kWh per day.

Each city page shows monthly PSH, seasonal variance, best and worst months, and an off-grid system-sizing calculator you can customize with your own loads.